Old 12-05-2016, 08:24 AM #1
Hap's Avatar
Hap Hap is online now
Super Moderator
 
Join Date: Sep 2013
Location: Morro Bay, California
Posts: 6,858
Rep Power: 11622
Hap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond repute
Send a message via Skype™ to Hap
Hap Hap is online now
Super Moderator
Hap's Avatar
 
Join Date: Sep 2013
Location: Morro Bay, California
Posts: 6,858
Rep Power: 11622
Hap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond repute
Send a message via Skype™ to Hap
Default Visiblity help!

Hello folks,

I've recently completed most rainbow(at least good enough for me) so I was thinking about venturing out into the Near-IR range of lasers just so I can have one in my possession, as every hobbyist should!

Now, laserbtb has some pretty neat 808nm pen styled lasers for pretty good prices. The one I am eyeing is their 5mW version(most likely more) for $26.57! I do have a few questions though, and yes, I did look in the search bar but most the questions regarding visibility for this wavelength weren't as such low powers, mostly around 100mW-300mW.

-Would 5mW of 808 be visible? At all? I don't need anything stunning but I've seen 4mW's of 405 in mid-day and could barely see the dot across my room. I've read that the human eye can actually see past the "general" 780nm end limit range of what you can see. I am not very interested in going into their next power level, 100mW as this stats entering dangerous territory, plus I'd most likely not use it other then to look at!

Thank you!

-Alex


__________________
650nm: (laserbtb) LP650-5 6mW
635nm: (eBay) Generic "Laser Pointer Pen 5mW
532nm: (Z-Bolt) BTG-2-S 3mW | (eBay) CNI MGL-F-532 2.6W
515nm: (eBay) Generic "Laser Pointer Pen" 14mW
473nm: (eBay) CNI GLP-473 6mW
447nm: (ReadyLasers) CNI GLP-447 3mW
405nm: (Roithner) CNI GLP-405 12mW

"Open your eyes, look within. Are you satisfied with the life you're living?" -Bob Marley
“The universe is a pretty big place. If it's just us, seems like an awful waste of space.” -Carl Sagan
You are important: Pale Blue Dot

Hap is online now   Reply With Quote










Old 12-05-2016, 08:48 AM #2
Alaskan's Avatar
Class 4 Laser
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,449
Rep Power: 13304
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Alaskan Alaskan is offline
Class 4 Laser
Alaskan's Avatar
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,449
Rep Power: 13304
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Default Re: Visiblity help!

I would not expect to see 5mw of 808nm as a beam set to infinity focus, but might be possible to see a very tiny dim red dot if focused into a very fine point on black paper or something. If there is enough power, you can see 808nm as a dim red color but that much power is dangerous if you are too close to it, or get a direct reflection, according to all of the advise I've seen here. I can clearly see a tiny red dot from the output of a 200mw laser pointer on black paper, when focused to a point, so maybe you will. Turn off the lights and try it at 5mw.

I would be interested in knowing if a 5mw pointer can be viewed as a tiny red dot or not because I am doubtful you will see anything that way.
__________________

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

Laser Safety: http://www.laserpointersafety.com/index.html

Sam's Laser FAQ: Sam's Laser FAQ: Welcome Page

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
Alaskan is offline   Reply With Quote
Old 12-05-2016, 08:51 AM #3
Hap's Avatar
Hap Hap is online now
Super Moderator
 
Join Date: Sep 2013
Location: Morro Bay, California
Posts: 6,858
Rep Power: 11622
Hap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond repute
Send a message via Skype™ to Hap
Hap Hap is online now
Super Moderator
Hap's Avatar
 
Join Date: Sep 2013
Location: Morro Bay, California
Posts: 6,858
Rep Power: 11622
Hap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond repute
Send a message via Skype™ to Hap
Default Re: Visiblity help!

Quote:
Originally Posted by Alaskan View Post
I would not expect to see 5mw of 808nm as a beam set to infinity focus, but might be possible to see a very tiny dim red dot if focused into a very fine point on black paper or something. If there is enough power, you can see 808nm as a dim red color but that much power is dangerous if you are too close to it, or get a direct reflection, according to all of the advise I've seen here. I can clearly see a tiny red dot from the output of a 200mw laser pointer on black paper, when focused to a point, so maybe you will. Turn off the lights and try it at 5mw.

I would be interested in knowing if a 5mw pointer can be viewed as a tiny red dot or not because I am doubtful you will see anything that way.
Hello Alaskan,

Thanks! Yeah, 5mW of 808nm is definitely pushing what our eyes can see. I'll wait until a couple more posts come in and I'll make my decision then. It's not a very expensive laser so it wouldn't be a huge loss

-Alex
__________________
650nm: (laserbtb) LP650-5 6mW
635nm: (eBay) Generic "Laser Pointer Pen 5mW
532nm: (Z-Bolt) BTG-2-S 3mW | (eBay) CNI MGL-F-532 2.6W
515nm: (eBay) Generic "Laser Pointer Pen" 14mW
473nm: (eBay) CNI GLP-473 6mW
447nm: (ReadyLasers) CNI GLP-447 3mW
405nm: (Roithner) CNI GLP-405 12mW

"Open your eyes, look within. Are you satisfied with the life you're living?" -Bob Marley
“The universe is a pretty big place. If it's just us, seems like an awful waste of space.” -Carl Sagan
You are important: Pale Blue Dot

Hap is online now   Reply With Quote
Old 12-05-2016, 12:12 PM #4
CurtisOliver's Avatar
Class 3R Laser
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
CurtisOliver CurtisOliver is online now
Class 3R Laser
CurtisOliver's Avatar
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
Default Re: Visiblity help!

For a 808nm to have the same brightness as a 1mW 650nm pointer, you would need 50W with an output of ~0.07 lumens between them.
5mW of 808 is 7.216 μLm and would be as bright as 0.1μW of 650nm.
I hope that clears things up.
__________________
View my laser collection



Please make a post in our Member Collections Section. Where you can share your laser collection in one place for all of the forum to see.

Useful Links:
http://darekk.com/kalkulator/wavelength-to-rgb


Feel free to use this +rep icon.
Just right click and open image in new tab,
and then copy and paste the link into those IMG tags.
CurtisOliver is online now   Reply With Quote
Old 12-05-2016, 03:29 PM #5
grainde's Avatar
Class 3B Laser
 
Join Date: Jan 2012
Location: Alsace
Posts: 2,616
Rep Power: 7815
grainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond repute
grainde grainde is online now
Class 3B Laser
grainde's Avatar
 
Join Date: Jan 2012
Location: Alsace
Posts: 2,616
Rep Power: 7815
grainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond reputegrainde has a reputation beyond repute
Default Re: Visiblity help!

I have a 250 mW 790 nm build and the light is not visible unless focused through a lens. Even still, when focused, it appears as a very dim dark reddish dot...

All our eyes are different anyway and some people can see better toward each end of the visible spectrum - visible is considered 400 - 800 nm.

So I wouldnt really expect a 5 mW 808 to be very useful unless you are using some sort of detector to pick it up, or camera lcd to view it. As Im sure you know IR is also dangerous, because you cant see where the beam is going. This means you could quite easily and inadvertently pick up a specular reflection.
__________________
New to lasers & want some info on how to build a laser? Look here: Build a laser

Need info on goggles? Look here: Get safety goggles now!

FS Custom Sinner Host builds available now!


Here is my old Kryton Groove FS thread!

100mW 405 PHR
700mW 405

2W 445 C6--link--
+2.3W 445 --link--
+2.5W 445 --link--

190mW 450 --link--
15mW 510nm
5mW 532 --link--
25mW 532 --link--

520mW 638 --link--
1W 638

250mW 650
250mW 780

3000 Lm C8 MTG2 @ 6 A!
Poppas mod 3A --link--
Sipik 98 Cu pill/star mod --link--

Last edited by grainde; 12-05-2016 at 03:30 PM.
grainde is online now   Reply With Quote
Old 12-05-2016, 05:15 PM #6
Class 3R Laser
 
Join Date: May 2011
Posts: 2,268
Rep Power: 11375
Encap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond repute
Encap Encap is offline
Class 3R Laser
 
Join Date: May 2011
Posts: 2,268
Rep Power: 11375
Encap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond reputeEncap has a reputation beyond repute
Default Re: Visiblity help!

Quote:
Originally Posted by Hap View Post
Hello folks,

I've recently completed most rainbow(at least good enough for me) so I was thinking about venturing out into the Near-IR range of lasers just so I can have one in my possession, as every hobbyist should!

Now, laserbtb has some pretty neat 808nm pen styled lasers for pretty good prices. The one I am eyeing is their 5mW version(most likely more) for $26.57! I do have a few questions though, and yes, I did look in the search bar but most the questions regarding visibility for this wavelength weren't as such low powers, mostly around 100mW-300mW.

-Would 5mW of 808 be visible? At all? I don't need anything stunning but I've seen 4mW's of 405 in mid-day and could barely see the dot across my room. I've read that the human eye can actually see past the "general" 780nm end limit range of what you can see. I am not very interested in going into their next power level, 100mW as this stats entering dangerous territory, plus I'd most likely not use it other then to look at!

Thank you!

-Alex
It depends upon your particualr eyes as to whether or not you can detect light outside the visible range considered "normal" human spectral sensitivity.

Have a look here: Human infrared vision is triggered by two-photon chromophore isomerization
Abstract from above paper- "Vision relies on photoactivation of visual pigments in rod and cone photoreceptor cells of the retina. The human eye structure and the absorption spectra of pigments limit our visual perception of light. Our visual perception is most responsive to stimulating light in the 400- to 720-nm (visible) range. First, we demonstrate by psychophysical experiments that humans can perceive infrared laser emission as visible light. Moreover, we show that mammalian photoreceptors can be directly activated by near infrared light with a sensitivity that paradoxically increases at wavelengths above 900 nm, and display quadratic dependence on laser power, indicating a nonlinear optical process. Biochemical experiments with rhodopsin, cone visual pigments, and a chromophore model compound 11-cis-retinyl-propylamine Schiff base demonstrate the direct isomerization of visual chromophore by a two-photon chromophore isomerization. Indeed, quantum mechanics modeling indicates the feasibility of this mechanism. Together, these findings clearly show that human visual perception of near infrared light occurs by two-photon isomerization of visual pigments. "

See also interesting article on this subject here: https://source.wustl.edu/2014/12/the...nfrared-light/
From above article:
“The visible spectrum includes waves of light that are 400-720 nm long,” said co-author Dr Vladimir Kefalov of Washington University School of Medicine in St. Louis. But if a pigment molecule in the retina is hit in rapid succession by a pair of photons that are 1,000 nm long, those light particles will deliver the same amount of energy as a single hit from a 500-nm photon, which is well within the visible spectrum. That’s how we are able to see it.”

Another avenue of research--a very interesting one ---these guys are trying to "hack" eye senstivity to nIR by changing nutrition---they hope to extend the eyes sensitivity to IR by about 20nm by brute biological force. See: http://scienceforthemasses.org/infrared-project/
From above article:
"Color is not a physical property; it is merely the brain’s interpretation of different wavelengths of light. Human vision spans a visual spectrum of approximately 390-720nm. At the short end (390) is what we perceive as blue; at the long end (720) is red. This is nowhere near all light; in fact, it comprises less than an estimated 1% of 1% of the entire electromagnetic spectrum. The narrow range of light we can see is primarily a result of what wavelengths our photopigments are sensitive to; as an engineer would say, the pigments are the bottleneck.

Our pigments (photopsin in the cones, rhodopsin in the rods) are comprised of a protein complex called opsin, which is native to the eye, and retinal, a derivative of retinol, or vitamin A (A1). Not all animals with a visual pathway like ours use vitamin A in their pigments, however. Of interest to us, freshwater fish (along with some crustaceans & amphibians) use the pigment porphyropsin, which is composed of 3,4-dehydroretinol, also called vitamin A2, in conjunction with opsin. This photopigment has been shown to be sensitive to light of wavelengths up to 1400nm in some species, which is well into the near infrared range.

Our research has indicated that human beings are fully capable of using vitamin A2 to form our pigments; however, vitamin A1 has a 3-4x greater bioactivity as compared to A2. We believe this to be as a result of both cellular transport mechanisms having a greater affinity for A1, and competitive inhibition (for the layperson, “first come, first serve”).

The aim of the NIR visual perception pilot study is to exploit this opening in the human visual pathway in a brute force metabolic hack. The members of Science for the Masses and a handful of our collaborators will completely eliminate all retinoids and caretinoids (vitamin A and its provitamins) from our diets by switching to a special vitamin A deficient (VAD) blend of Soylent provided to us by special request. We will then supplement with two compounds: 3,4-dehydroretinol (A2) and retinoic acid (RA). Retinoic acid is a derivative of vitamin A which plays a critical role in gene transcription and a host of other systemic processes, and without which we would quickly fall ill and be forced to discontinue the pilot study. Unfortunately, RA has not been shown to synthesize from vitamin A2 in mammals; luckily, however, it appears that there is severely limited intraconvertibility between RA and vitamin A, if any, and so we don’t expect this additional supplementation to sabotage our attempts to hack the visual pathway."

Pretty cool Idea---no?

Why are you interested in attempting to "see", if it can be called that, or detect photon wavelengths outside the visible spectrum?
It is an interesting subject for sure. In any case good luck to you.

Last edited by Encap; 12-05-2016 at 06:20 PM.
Encap is offline   Reply With Quote
Old 12-05-2016, 06:44 PM #7
Hap's Avatar
Hap Hap is online now
Super Moderator
 
Join Date: Sep 2013
Location: Morro Bay, California
Posts: 6,858
Rep Power: 11622
Hap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond repute
Send a message via Skype™ to Hap
Hap Hap is online now
Super Moderator
Hap's Avatar
 
Join Date: Sep 2013
Location: Morro Bay, California
Posts: 6,858
Rep Power: 11622
Hap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond reputeHap has a reputation beyond repute
Send a message via Skype™ to Hap
Default Re: Visiblity help!

Okay folks, it's going to be a no-go

-Alex
__________________
650nm: (laserbtb) LP650-5 6mW
635nm: (eBay) Generic "Laser Pointer Pen 5mW
532nm: (Z-Bolt) BTG-2-S 3mW | (eBay) CNI MGL-F-532 2.6W
515nm: (eBay) Generic "Laser Pointer Pen" 14mW
473nm: (eBay) CNI GLP-473 6mW
447nm: (ReadyLasers) CNI GLP-447 3mW
405nm: (Roithner) CNI GLP-405 12mW

"Open your eyes, look within. Are you satisfied with the life you're living?" -Bob Marley
“The universe is a pretty big place. If it's just us, seems like an awful waste of space.” -Carl Sagan
You are important: Pale Blue Dot

Hap is online now   Reply With Quote
Old 03-29-2017, 08:30 PM #8
CurtisOliver's Avatar
Class 3R Laser
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
CurtisOliver CurtisOliver is online now
Class 3R Laser
CurtisOliver's Avatar
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
Default Re: Visiblity help!

Can you stop necro posting without adding anything useful to the thread.
__________________
View my laser collection



Please make a post in our Member Collections Section. Where you can share your laser collection in one place for all of the forum to see.

Useful Links:
http://darekk.com/kalkulator/wavelength-to-rgb


Feel free to use this +rep icon.
Just right click and open image in new tab,
and then copy and paste the link into those IMG tags.
CurtisOliver is online now   Reply With Quote
Old 03-29-2017, 08:51 PM #9
diachi's Avatar
Class 4 Laser
 
Join Date: Feb 2008
Location: Yellowknife, NT, Canada
Posts: 7,578
Rep Power: 12369
diachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond repute
Send a message via Skype™ to diachi
diachi diachi is online now
Class 4 Laser
diachi's Avatar
 
Join Date: Feb 2008
Location: Yellowknife, NT, Canada
Posts: 7,578
Rep Power: 12369
diachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond reputediachi has a reputation beyond repute
Send a message via Skype™ to diachi
Default Re: Visiblity help!

Quote:
Originally Posted by CurtisOliver View Post
Can you stop necro posting without adding anything useful to the thread.

Heh, banned!
__________________


445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1W(?) | Review Unit - Awaiting Arrival | >>LaserPointerStore Thread<<
488nm | Spectra Physics 163 Argon | ~30mW Metered
515nm | PL515 Pen Build | 50mW Metered | >>Build Thread<<
520nm | Laserlands 520 | 5mW | Review Unit | 3mW metered | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD.850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2



Check out my Reddit Subreddit! >>/r/laserpointers<<

diachi is online now   Reply With Quote
Old 03-30-2017, 05:41 AM #10
CurtisOliver's Avatar
Class 3R Laser
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
CurtisOliver CurtisOliver is online now
Class 3R Laser
CurtisOliver's Avatar
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
Default Re: Visiblity help!

I had a feeling it was coming. I saw him necroposting a few times along with multiple pointless posts.
__________________
View my laser collection



Please make a post in our Member Collections Section. Where you can share your laser collection in one place for all of the forum to see.

Useful Links:
http://darekk.com/kalkulator/wavelength-to-rgb


Feel free to use this +rep icon.
Just right click and open image in new tab,
and then copy and paste the link into those IMG tags.
CurtisOliver is online now   Reply With Quote
Old 03-30-2017, 05:50 AM #11
Radim's Avatar
Class 2M Laser
 
Join Date: Aug 2016
Location: European Union
Posts: 644
Rep Power: 7187
Radim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond repute
Radim Radim is online now
Class 2M Laser
Radim's Avatar
 
Join Date: Aug 2016
Location: European Union
Posts: 644
Rep Power: 7187
Radim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond reputeRadim has a reputation beyond repute
Default Re: Visiblity help!

I wanted to mention, what Encap mentioned already. It depends on your eyes. I do not have 808 nm laser yet (except as internal pumping), but you can maybe do some experiment by seeing TV IR remote for example and compare it with view via camera. The wavelength is slightly different however. Just to get some idea how much IR you can see.

Edit: Damn it! I did not noticed the date - just that Alex is considering new laser. Sorry guys.
__________________
"Lasers are s3xy."
"That feeling when you see colours as their wavelengths."
"Laserpainting is a drug. Do not try it."


Current collection:
405 nm | 500 mW | Wicked Lasers Lunar
445 nm | 3.5 W | Wicked Lasers Arctic
473 nm | 100 mW | Jet Lasers PL-E Pro (Review)
520 nm | 1 W | Wicked Lasers Krypton
532 nm | 100 mW | Wicked Lasers Evo
532 nm | 800 mW | Sky Lasers PL

589 nm | 50 mW | Dragon Lasers Spartan
635 nm | 750 mW | Wicked Lasers Inferno
1 W RGB projector
(+ some laser pointers)

Laserpainting artworks:
LPF thread: Radim's laser painting
Latest laserpainting: The Portal
Instagram: @radimmatera

Please use hashtag #laserpointerforums for laser related stuff when you post on social media to help us promote LPF. Thank you.

Last edited by Radim; 03-30-2017 at 05:52 AM.
Radim is online now   Reply With Quote
Old 03-30-2017, 05:55 AM #12
CurtisOliver's Avatar
Class 3R Laser
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
CurtisOliver CurtisOliver is online now
Class 3R Laser
CurtisOliver's Avatar
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
Default Re: Visiblity help!

necro ^^^^
Don't worry you are contributing.
__________________
View my laser collection



Please make a post in our Member Collections Section. Where you can share your laser collection in one place for all of the forum to see.

Useful Links:
http://darekk.com/kalkulator/wavelength-to-rgb


Feel free to use this +rep icon.
Just right click and open image in new tab,
and then copy and paste the link into those IMG tags.
CurtisOliver is online now   Reply With Quote
Old 03-30-2017, 07:46 AM #13
CurtisOliver's Avatar
Class 3R Laser
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
CurtisOliver CurtisOliver is online now
Class 3R Laser
CurtisOliver's Avatar
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
Default Re: Visiblity help!

Quote:
Originally Posted by Lazer6700k View Post
No it wouldn't really be visible. However, you may be able to see the beam by looking at the line of it. If you want something that is visible go for a 532nm or 450nm. Those two are most visible to the human eye!
Never try to see the beam of a 808 or any other IR laser! That is a sure fire way of going blind.


The wavelength that is closer to the photopic peak of 555nm is always going to be brighter per mW. 532nm brighter than 450nm for example. The brightest wavelengths we currently have available to us are: 532 (DPSS) ,543 (HeNe), 556 (DPSS), 561 (DPSS),568.2 (Kr+), and 577 (OPSL). Another factor is Rayleigh scattering which favours shorter wavelengths. So a wavelength on the <555nm side of the peak will have a brighter beam in comparison to a >555nm wavelength.
__________________
View my laser collection



Please make a post in our Member Collections Section. Where you can share your laser collection in one place for all of the forum to see.

Useful Links:
http://darekk.com/kalkulator/wavelength-to-rgb


Feel free to use this +rep icon.
Just right click and open image in new tab,
and then copy and paste the link into those IMG tags.
CurtisOliver is online now   Reply With Quote
Old 04-01-2017, 12:46 PM #14
Atomicrox's Avatar
Class 3R Laser
 
Join Date: Jun 2011
Posts: 2,151
Rep Power: 1944
Atomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond repute
Atomicrox Atomicrox is offline
Class 3R Laser
Atomicrox's Avatar
 
Join Date: Jun 2011
Posts: 2,151
Rep Power: 1944
Atomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond reputeAtomicrox has a reputation beyond repute
Default Re: Visiblity help!

I will chime in even though it's an old post. I can see 7mW of 850nm as a dull red dot on the (nearby) wall of a dark room. You'll very likely be able to see 5mW of 808nm, but it won't be bright. And forget about getting a visible beam or seeing the dot from far away.
__________________
405nm: NewWish (29.1mW avg|5mW rtd) | Dilda (81.5mW avg|200mW rtd) | 501B by Blord (633mW pk)
low 445nm: C6 from Survival Lasers (1351mW pk|1289mW avg|1100mW rtd)
high 450nm: NewWish (12.6mW pk|5mW rtd) | Dominator by Blord (3010mW pk|2779mW avg during 5min)
462nm: 501B by Atomic (1507mW avg)
473nm: BWB-10-OEM labby by CNI (10mW rtd)
520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
532nm: NewWish (28.6mW pk|26.8mW avg|10mW rtd) | Dapper (30.3mW pk) | Classic (120.0mW pk|103.1mW avg|100mW rtd) | "The Green Box" by Atomic (176.7mW pk|140.0mW avg)
589nm: Spartan from Dragon Lasers (58.4mW pk|37mW avg|50mW rtd)
632.8nm: HeNe pointer by Atomic (0.68mW rtd)
635nm: NewWish (4.6mW avg|5mW rtd)
638nm: Classic from Lazerer (409.3mW pk|389.4mW avg|415mW rtd)
650nm: NewWish (10.6mW pk|5mW rtd) | Dilda (216.3mW avg|200mW rtd)
685nm: laser-in-a-box by Atomic (30.4mW pk|29.3mW avg) | 501B by Atomic (32.4mW avg)
780nm: module (2.7mW avg|5mW rtd)
808nm: Classic modded from a 532nm (162mW avg)
850nm: module (8.8mW avg|7mW rtd)
980nm: NewWish (81mW pk|5mW rtd) | 2nd line around 490nm

5W Ophir LPM

HV: Flyback, Plasma Speaker, The Arcsynth and SSTC
Atomicrox is offline   Reply With Quote
Old 04-01-2017, 01:15 PM #15
Alaskan's Avatar
Class 4 Laser
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,449
Rep Power: 13304
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Alaskan Alaskan is offline
Class 4 Laser
Alaskan's Avatar
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,449
Rep Power: 13304
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Default Re: Visiblity help!

I'm surprised you see a dot from 7mw of 850nm, unless focused to a very tiny point, or was it?
__________________

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

Laser Safety: http://www.laserpointersafety.com/index.html

Sam's Laser FAQ: Sam's Laser FAQ: Welcome Page

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

To shorten my signature I have moved most of my laser related web links to this forum page, the second post in that thread shows most of my builds... Alaskan's Laser Links: http://laserpointerforums.com/f44/al...ml#post1449395


Sincerely investigate any of these three short quotes as new concepts and you've taken your first step into a larger world:

"I regard consciousness as fundamental. I regard matter as derivative from consciousness..." - Max Planck. "Everything we call real is made of things that cannot be regarded as real" - Neils Bohr. "What we call physical things and events do not exist independently of subjective experience..." - Deepak Chopra.

Each of these three rabbit holes go deep, ending up in the same place.

Useless troll fighting.
Alaskan is offline   Reply With Quote
Old 04-01-2017, 01:18 PM #16
CurtisOliver's Avatar
Class 3R Laser
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
CurtisOliver CurtisOliver is online now
Class 3R Laser
CurtisOliver's Avatar
 
Join Date: Jun 2015
Location: Brentwood, England (Near London)
Posts: 2,471
Rep Power: 12178
CurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond reputeCurtisOliver has a reputation beyond repute
Default Re: Visiblity help!

850nm really is hitting the edge of what our eyes can see. And 7mW is not much. Have you got IR vision Atomicrox?
Exactly how dull are we talking? 10W of 808 appears dimmer than around 1-2mW. 7mW of 850 would probably be like looking at 60-70nW (0.06-0.07 µW) of 650nm.
__________________
View my laser collection



Please make a post in our Member Collections Section. Where you can share your laser collection in one place for all of the forum to see.

Useful Links:
http://darekk.com/kalkulator/wavelength-to-rgb


Feel free to use this +rep icon.
Just right click and open image in new tab,
and then copy and paste the link into those IMG tags.

Last edited by CurtisOliver; 04-01-2017 at 01:26 PM.
CurtisOliver is online now   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading












Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 12:34 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC