Old 01-06-2009, 10:13 PM #1
Traveller's Avatar
Class 3R Laser
 
Join Date: Dec 2008
Location: curr. Vienna, AT
Posts: 1,223
Rep Power: 74
Traveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond repute
Traveller Traveller is offline
Class 3R Laser
Traveller's Avatar
 
Join Date: Dec 2008
Location: curr. Vienna, AT
Posts: 1,223
Rep Power: 74
Traveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond repute
Default How to test / check for IR Emission?

Hi2all!

Like many of you here, I own a 532nm laser which theoretically uses an IR filter. I plan to purchase safety goggles to protect against 532nm wavelengths but such goggles generally do not protect against IR wavelengths.

So clearly I'd like to verify that my laser is indeed equipped with an IR filter. Is there any simple way, without an IR card, to check for (heavy) IR emissions?

FWIW, I have a Sony Cybershot DSC-V1 that has the ability to take shots in IR mode (the camera basically removes the internal IR filter and also emits an IR beam). I figured that if a laser were to emit excessive IR, then it should be considerably brighter when viewed by the camera in Nightshot mode (IR) then when viewed in standard mode... .

What do you think and/or can you recommend a fool-proof test please?

Your $0.02 will be much appreciated *


__________________
Traveller - Geneva * Melbourne * Miami * Vienna

lasers * Reviews
Traveller is offline   Reply With Quote










Old 01-06-2009, 10:23 PM #2
Class 1M Laser
 
Join Date: Nov 2008
Posts: 120
Rep Power: 9
ska8r411 is on a distinguished road
ska8r411 ska8r411 is offline
Class 1M Laser
 
Join Date: Nov 2008
Posts: 120
Rep Power: 9
ska8r411 is on a distinguished road
Default Re: How to test / check for IR Emission?

Try this:

Get 1 or 2 negitive film cards,then things that come in disposible camera prints along with your pictures.

Cut into 5 prices and gather them up

Then shine your laser through the film negitives.

While doing that take a picture of video with your camera

If you see a purpleish dot their then that means it's leaking IR

Hope that helps! *
ska8r411 is offline   Reply With Quote
Old 01-06-2009, 11:31 PM #3
phoenix77's Avatar
Class 3B Laser
 
Join Date: Apr 2008
Location: INDIANA
Posts: 3,929
Rep Power: 516
phoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond repute
phoenix77 phoenix77 is offline
Class 3B Laser
phoenix77's Avatar
 
Join Date: Apr 2008
Location: INDIANA
Posts: 3,929
Rep Power: 516
phoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond reputephoenix77 has a reputation beyond repute
Default Re: How to test / check for IR Emission?

You don't need to go through all that. Just turn on your laser, & look through the LCD screen while pointing the camera at the laser FROM AN ANGLE. If it's leaking IR, you should see purplish colored rays coming out of the laser
__________________

phoenix77 is offline   Reply With Quote
Old 01-07-2009, 04:06 AM #4
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,475
Rep Power: 1309
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,475
Rep Power: 1309
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: How to test / check for IR Emission?

The green light is going to swamp out the IR, and most Sony cameras have detectors to switch out of night vision mode if there is too much visible light (to prevent them from seeing through clothing). *You'll need an IR-pass filter to block out the visible light and allow only the IR to pass through.

Even so, these green laser pointers nearly ALL produce noticeable amounts of IR compared to "real" IR-filtered lasers like the PGL-III (Alpha series) lasers, even if "filtered." *When I did some visual tests with my IR camera and an IR-pass filter, even the 5mW laser pointers still produced more IR than the PGL-III I have (~80mW). *Still, that doesn't mean the amount of IR emitted is dangerous; they nearly all leak some. *To test for a definitive amount, you'll need a meter and a way of blocking the green light. *A red-pass filter can work, just make sure it doesn't melt from absorbing the green.

You can always pay more for some broadband 532nm + IR protecting goggles.
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is offline   Reply With Quote
Old 01-08-2009, 12:17 PM #5
Traveller's Avatar
Class 3R Laser
 
Join Date: Dec 2008
Location: curr. Vienna, AT
Posts: 1,223
Rep Power: 74
Traveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond repute
Traveller Traveller is offline
Class 3R Laser
Traveller's Avatar
 
Join Date: Dec 2008
Location: curr. Vienna, AT
Posts: 1,223
Rep Power: 74
Traveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond repute
Default Re: How to test / check for IR Emission?

Thanks to all for the kind support and innovative suggestions

Phoenix, I tried your &quot;quicktest&quot; but I can't say that I saw anything... *:-/

Bionic Badger, sounds to me like you've done some IR photography in your time... *

Although I'd still like to try out the other options you've presented, in the meantime I figured out a way to check my own LP for an IR filter &amp; yes, it has one! What I did was to remove the batteries and shine a powerful light source into the back-end of the host and I was able to clearly see the square blue-greenish filter that was glued in place.

As a matter of fact, I even managed to clearly see the KTP holder and the purplish Vanadate crystal (Nd:YVO4) attached to / behind the KTP *

But I will still try to run those test(s) because I think it's important to know when a pair of 532nm goggles will be enough or not. Bionic Badger, thanks for the link to the multi-wavelength googles, that would probably be the smartest move &amp; I might even be able to swallow the $160 (+ shipping + 16% customs + 20% VAT - EU taxes...), but I don't want to loose to much visibility by blocking out too much light... *:-/

__________________
Traveller - Geneva * Melbourne * Miami * Vienna

lasers * Reviews
Traveller is offline   Reply With Quote
Old 01-29-2009, 08:30 PM #6
Class 3B Laser
 
Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 219
Hallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond repute
Send a message via MSN to Hallucynogenyc
Hallucynogenyc Hallucynogenyc is offline
Class 3B Laser
 
Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 219
Hallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond repute
Send a message via MSN to Hallucynogenyc
Default Re: How to test / check for IR Emission?

Just use a red plastic (like the one in a 3D glasses)

http://images.google.com/images?clie...a=N&amp;tab=wi

Then just look after the filter with a digital camera (to test if it see IR just push the remote control of your TV and look at the light bulb with the camera).
__________________
The difference between an ignorant and a wise is that the wise knows the limits of his knowledge while the ignorant ignores the limits of his ignorance.
Learn how to use Opera and tell me about your experience here!


Wicked Lasers Evolution Pro 130mW ------------------> Review
Rayfoss 150mW waterproof
Rayfoss 200mW focusable torch -----------------------> Review
Dealextreme 5mW true laser pointer
Dealextreme 50mW true laser pointer
Dealextreme 100mW true laser pointer
Laserlands 30mW disco laser --------------------------> Review
5mW pointers (many of them)
DX 200mW Red laser (Dilda) --------------------------> Review
120mW PHR custom build
200mW GGW custom build

Focalprice 7$ green&bluray laser goggles
Dealextreme tripod and clamp for laser holding -----> Review
DIY 3 motor Spirograph --------------------------------> Review
HLPM-2 laser power meter
Hallucynogenyc is offline   Reply With Quote
Old 02-10-2016, 06:46 AM #7
Junior Member
 
Join Date: Feb 2016
Posts: 3
Rep Power: 0
Halfy is just really niceHalfy is just really niceHalfy is just really niceHalfy is just really niceHalfy is just really nice
Halfy Halfy is offline
Junior Member
 
Join Date: Feb 2016
Posts: 3
Rep Power: 0
Halfy is just really niceHalfy is just really niceHalfy is just really niceHalfy is just really niceHalfy is just really nice
Default Re: How to test / check for IR Emission?

Quote:
Originally Posted by Hallucynogenyc View Post
Just use a red plastic (like the one in a 3D glasses)

Google Images

Then just look after the filter with a digital camera (to test if it see IR just push the remote control of your TV and look at the light bulb with the camera).
Well I did the test, verified that my cell phone will pick up IR light (much better than I expected) and shined the laser through the red lens of a pair of 3D glasses. The majority of the green light was filtered out, so to the naked eye it was just a very small and dim green point. On the camera though, it was a purplish-white light. Much larger than the dim green light, but not nearly as bright as the green laser itself was on camera.
Halfy is offline   Reply With Quote
Old 02-10-2016, 02:29 PM #8
diachi's Avatar
Class 4 Laser
 
Join Date: Feb 2008
Location: Yellowknife, NT, Canada
Posts: 7,622
Rep Power: 13138
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: 7,622
Rep Power: 13138
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: How to test / check for IR Emission?

Quote:
Originally Posted by Halfy View Post
Well I did the test, verified that my cell phone will pick up IR light (much better than I expected) and shined the laser through the red lens of a pair of 3D glasses. The majority of the green light was filtered out, so to the naked eye it was just a very small and dim green point. On the camera though, it was a purplish-white light. Much larger than the dim green light, but not nearly as bright as the green laser itself was on camera.
That works - although it's not a good measure of how much IR is leaking! You need a power meter for that.

Also - this thread was last posted to in 2009, over 7 years ago. Please avoid bringing back old threads from the dead.

Thanks!
__________________


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 02-10-2016, 03:52 PM #9
RedCowboy's Avatar
Class 3B Laser
 
Join Date: Jul 2015
Location: Suburbs of Atlanta Georgia
Posts: 4,441
Rep Power: 12608
RedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond repute
RedCowboy RedCowboy is online now
Class 3B Laser
RedCowboy's Avatar
 
Join Date: Jul 2015
Location: Suburbs of Atlanta Georgia
Posts: 4,441
Rep Power: 12608
RedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond reputeRedCowboy has a reputation beyond repute
Default Re: How to test / check for IR Emission?

Shine the laser through green blocking laser glasses and use a ccd camera to see if any ir is on the other side? Striking a black sheet of paper maybe?

Yes, web cams, security cams, all but photography cameras usually don't have the ir filter.

If you have a power meter you can use an ir filter and see if the output drops.
__________________
You can not put freedom in a bag.
It is in fact an abstract concept.
Yet it is the single most valuable thing anyone has ever had.

Last edited by RedCowboy; 02-10-2016 at 03:55 PM.
RedCowboy is online now   Reply With Quote
Old 02-10-2016, 03:57 PM #10
OVNI's Avatar
h new guy
 
Join Date: Oct 2015
Location: Los Angeles
Posts: 499
Rep Power: 513
OVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond repute
OVNI OVNI is offline
h new guy
OVNI's Avatar
 
Join Date: Oct 2015
Location: Los Angeles
Posts: 499
Rep Power: 513
OVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond reputeOVNI has a reputation beyond repute
Default Re: How to test / check for IR Emission?

You can also look for the IR 'dot' or beam width on a nearby wall using the CCD camera. IR, with its much longer wavelength, will have a much larger circle surrounding the 'dot' made by the green wavelength.
OVNI is offline   Reply With Quote
Old 02-10-2016, 04:15 PM #11
diachi's Avatar
Class 4 Laser
 
Join Date: Feb 2008
Location: Yellowknife, NT, Canada
Posts: 7,622
Rep Power: 13138
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: 7,622
Rep Power: 13138
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: How to test / check for IR Emission?

Quote:
Originally Posted by RedCowboy View Post
Shine the laser through green blocking laser glasses and use a ccd camera to see if any ir is on the other side? Striking a black sheet of paper maybe?

Yes, web cams, security cams, all but photography cameras usually don't have the ir filter.

If you have a power meter you can use an ir filter and see if the output drops.
Drops significantly at least - 532nm output will drop a little bit too with an IR filter.
__________________


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 02-11-2016, 12:32 AM #12
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,164
Rep Power: 5395
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,164
Rep Power: 5395
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: How to test / check for IR Emission?

Even cameras that DO have IR filters on them will be able to see near-IR light to some degree. You can easily verify this by pointing the camera at the tv remote and pressing a button. This will usually display flashes of light in some odd color (often purple-ish).

The wavelength of remote controls varies, it can be 850 to 980 nm, but is comparable to the IR light leaked from your typical green DPSS (808 and 1064 nm). The 808 nm pump light usually isn't collimated with the green light though, so at a distance it's not that much of a problem. The 1064 nm light may be more co-collimated, but if it's leaking a lot of that, the laser probably isn't working all that well (most modern dpss use intra-cavity doublers so leakage of 1064 also means loss of 532).
Benm is online now   Reply With Quote
Old 02-14-2016, 08:30 PM #13
Alaskan's Avatar
Class 4 Laser
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,487
Rep Power: 14169
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: 6,487
Rep Power: 14169
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: How to test / check for IR Emission?

I think the best method is using a filter which passes IR but blocks green with a power meter, but without the meter maybe use a security camera without the IR filter to look for the presence of IR after the visual spectrum light has been removed, as an indicator, but of course that won't tell you how much is there in terms of power.

The general consensus is not to bring old threads alive, but my thought is either you add to an old thread, if a reasonable amount of time has been spent searching, or make a duplicate thread all over again making future searches more difficult for the specific question. But.... I suspect some trolls post to old threads on purpose to get a rise out of members who have issue with it. Best not to post to old threads if a new member so as not to be mistaken as one.
__________________

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.

Last edited by Alaskan; 02-14-2016 at 08:34 PM. Reason: Fat fingers on iphone
Alaskan is offline   Reply With Quote
Old 02-15-2016, 12:37 AM #14
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,164
Rep Power: 5395
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,164
Rep Power: 5395
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: How to test / check for IR Emission?

As long as it's a sensible continuation or contribution i don't really see any problem with pickup up old threads.

That said, using cameras can verify that there is IR light emitted, and to some degree how well it's collimated with the desired green light. This is never quantitative as the sensitivity of cameras to near-IR light is extremely variable.

One thing that commonly leaks from 532 nm lasers is the 808 nm pump light, but that is rarely collimated with the green, so at a distance poses little danger. With intracavity doubling the amount of 1064 nm leaked is typically very low when the laser is working properly. If it is defective (e.g. due to a failed doubler), however, it might be signficant.
Benm is online now   Reply With Quote
Old 02-15-2016, 02:45 AM #15
Alaskan's Avatar
Class 4 Laser
 
Join Date: Jan 2014
Location: Southwest Asia
Posts: 6,487
Rep Power: 14169
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: 6,487
Rep Power: 14169
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: How to test / check for IR Emission?

My iPhone appears to have a IR filter in it as it isn't very sensitive to that wavelength, but I bought a cheap CCD camera and removed the filter and it is sensitive enough now. I've made some measurements of the IR alone from a cheap 8 dollar 50-100mw 532nm laser pointer from China and found the IR to typically be 20-25 percent of the total power, that is quite a lot, probably far more than better pointers, but they have no IR filter in them, some of the 532nm pointers do.
__________________

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
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








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 07:19 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