Old 09-20-2013, 09:34 PM #33
Atomicrox's Avatar
Class 3R Laser
 
Join Date: Jun 2011
Posts: 2,341
Rep Power: 174345
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: 2,341
Rep Power: 174345
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: What is the longest wavelength of laser light you have seen?

I forgot to post here when I finished my 685nm laser.
I'm convinced it is slightly more crimson (i.e. less orange) than regular 650/660nm lasers. The difference is very small, though. Only barely noticeable and only on the right surfaces...
Brightness wise, 30mW looks very similar to 3.5mW of regular red.

Now we need something slightly abov 700nm to compare.


__________________
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)
~462-476nm "Tunablue" by Atomic (1.5W pk)
480nm: hostless by Atomic (125mW pk)
505nm: hostless by Atomic (103mW pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (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

Last edited by Atomicrox; 09-20-2013 at 09:35 PM.
Atomicrox is offline   Reply With Quote


















Old 09-28-2013, 04:31 AM #34
zyxwv99's Avatar
Class 1M Laser
 
Join Date: May 2013
Location: California
Posts: 178
Rep Power: 34
zyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond repute
zyxwv99 zyxwv99 is offline
Class 1M Laser
zyxwv99's Avatar
 
Join Date: May 2013
Location: California
Posts: 178
Rep Power: 34
zyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond repute
Default Re: What is the longest wavelength of laser light you have seen?

I found out the highest wavelength that anyone can safely see and still see the color. It's about 1140nm.

Assuming your eyes are photopically (color vision) dark-adapted, that the laser shining in your eye has a 3 mm beam, and that it's shining in your eye for 1 second, if it was 850 nm it would need 8 nanowatts of output measured at the pupil for the average person to see it and see pure saturated color.

At 905 nm you would need 100 nanowatts. At 1064 nm you would need 69 microwatts. At 1152 nm you would need 3 to 4 mW. The only problem is, 2.5 mW is the maximum safe limit, so you can't safely see 1152. However, since the power needed rises by about 1.5 orders of magnitude for every 50 nm, going down to about 1140 nm should do the trick.
__________________
405 nm 5 mW
405 nm 100 mW focusing
532 nm 50 mW
650 nm 5 mW
808 nm 300 mW
980 / 490 nm 5 mW
Flashlights
365 nm 1 W UV Tank007 TK-566
940 nm 5 W Infrared Ultrafire 501B

http://lightcolorvision.wordpress.com/
zyxwv99 is offline   Reply With Quote
Old 09-28-2013, 02:07 PM #35
Atomicrox's Avatar
Class 3R Laser
 
Join Date: Jun 2011
Posts: 2,341
Rep Power: 174345
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: 2,341
Rep Power: 174345
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: What is the longest wavelength of laser light you have seen?

How did you find that out?
__________________
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)
~462-476nm "Tunablue" by Atomic (1.5W pk)
480nm: hostless by Atomic (125mW pk)
505nm: hostless by Atomic (103mW pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (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 09-28-2013, 02:24 PM #36
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,759
Rep Power: 181117
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
steve001 steve001 is offline
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,759
Rep Power: 181117
steve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond reputesteve001 has a reputation beyond repute
Default Re: What is the longest wavelength of laser light you have seen?

Quote:
Originally Posted by zyxwv99 View Post
I found out the highest wavelength that anyone can safely see and still see the color. It's about 1140nm.

Assuming your eyes are photopically (color vision) dark-adapted, that the laser shining in your eye has a 3 mm beam, and that it's shining in your eye for 1 second, if it was 850 nm it would need 8 nanowatts of output measured at the pupil for the average person to see it and see pure saturated color.

At 905 nm you would need 100 nanowatts. At 1064 nm you would need 69 microwatts. At 1152 nm you would need 3 to 4 mW. The only problem is, 2.5 mW is the maximum safe limit, so you can't safely see 1152. However, since the power needed rises by about 1.5 orders of magnitude for every 50 nm, going down to about 1140 nm should do the trick.

Interesting.
steve001 is offline   Reply With Quote
Old 09-28-2013, 02:25 PM #37
MorgothV8's Avatar
Junior Member
 
Join Date: Apr 2013
Location: Poland, MInsk Mazowiecki
Posts: 27
Rep Power: 0
MorgothV8 is on a distinguished road
Send a message via Skype™ to MorgothV8
MorgothV8 MorgothV8 is offline
Junior Member
MorgothV8's Avatar
 
Join Date: Apr 2013
Location: Poland, MInsk Mazowiecki
Posts: 27
Rep Power: 0
MorgothV8 is on a distinguished road
Send a message via Skype™ to MorgothV8
Default Re: What is the longest wavelength of laser light you have seen?

So what power would be needed to "see" CO2 ?? 10000 nm ?? :P
Of course just kidding - this IR wound not reach retina - eye is not transparent to this termal IR ....
__________________
The sun has cast its final rays over the Northern Skies.
MorgothV8 is offline   Reply With Quote
Old 09-28-2013, 04:36 PM #38
zyxwv99's Avatar
Class 1M Laser
 
Join Date: May 2013
Location: California
Posts: 178
Rep Power: 34
zyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond repute
zyxwv99 zyxwv99 is offline
Class 1M Laser
zyxwv99's Avatar
 
Join Date: May 2013
Location: California
Posts: 178
Rep Power: 34
zyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond reputezyxwv99 has a reputation beyond repute
Default Re: What is the longest wavelength of laser light you have seen?

My source for this:

Visual sensitivity of the eye to infrared laser radiation
David H. Sliney, Robert T. Wangemann, James K. Franks, and Myron L. Wolbarsht
JOSA, Vol. 66, Issue 4, pp. 339-341 (1976)
Optics InfoBase: Journal of the Optical Society of America - Visual sensitivity of the eye to infrared laser radiation
Optics InfoBase: Journal of the Optical Society of America - Table of Contents

You can read it online if you're willing to pay money. I just went to the library and special ordered it. They had it in a warehouse across the street so it only took one day. For 30 cents I got a photocopy of the three-page article.

It reviews all the previous major studies. Turns out the earlier ones were not taken seriously because of inadequate precautions to guarantee what wavelengths people were really seeing. In this study they went to extreme lengths. On the 1064nm laser, they used 4 filters, each with 5 nm bandwidth and 0.1% transmission outside the bandwidth. Then they ran tests and cross-checks.

Now I'm trying to look up archives of laser eye accidents to find out the highest wavelength anyone has ever seen even with eye injury. I'm guessing it's about 1250 nm for long duration, maybe 1342 for a femtosecond pulse.

As for seeing 10600 nm, the problem is not the opacity of the eye, since with enough power the light would still get through. The real problem would be your brain instantly turning into a ball of steam. The ensuing explosion would send bits of skull, scalp and hair flying all over the place. What was left of your head would instantly burst into flames.

Which wouldn't be so bad had you actually seen the light, only here's the problem: all this would happen before your eye had a chance to send a signal to your brain.
__________________
405 nm 5 mW
405 nm 100 mW focusing
532 nm 50 mW
650 nm 5 mW
808 nm 300 mW
980 / 490 nm 5 mW
Flashlights
365 nm 1 W UV Tank007 TK-566
940 nm 5 W Infrared Ultrafire 501B

http://lightcolorvision.wordpress.com/
zyxwv99 is offline   Reply With Quote
Old 09-28-2013, 07:01 PM #39
Atomicrox's Avatar
Class 3R Laser
 
Join Date: Jun 2011
Posts: 2,341
Rep Power: 174345
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: 2,341
Rep Power: 174345
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: What is the longest wavelength of laser light you have seen?

I'd +1 you but the forum won't let me.
__________________
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)
~462-476nm "Tunablue" by Atomic (1.5W pk)
480nm: hostless by Atomic (125mW pk)
505nm: hostless by Atomic (103mW pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (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

Last edited by Atomicrox; 09-28-2013 at 07:01 PM.
Atomicrox is offline   Reply With Quote
Old 10-16-2013, 02:32 AM #40
Class 2M Laser
 
Join Date: May 2009
Posts: 962
Rep Power: 48115
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
LSRFAQ LSRFAQ is offline
Class 2M Laser
 
Join Date: May 2009
Posts: 962
Rep Power: 48115
LSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond reputeLSRFAQ has a reputation beyond repute
Default Re: What is the longest wavelength of laser light you have seen?

When installing and tuning pulsed OPOs my eye response falls off sharply at 856 nm at the long end and about 410 at the short end. I'm the company LSO and I have the needed goggles and Joule meters to do this safely. We actually do the math for this. Viewing near UV is on my serious no-no list.

Our products tune about 214 to 2100 nm, unless you order the longer wavelength extenders, and then the IR goes out to 11 microns. . We throttle things back sharply, put on goggles to block the 1064 fundamental, 532, and 355. Then when training customers we can carefully play " Guess that Line" in the visible.

At the short end, with 7 nanosecond pulses, its hard to find things that don't fluoresce to determine the short end.

Steve
LSRFAQ is offline   Reply With Quote
Old 10-03-2014, 10:02 PM #41
Atomicrox's Avatar
Class 3R Laser
 
Join Date: Jun 2011
Posts: 2,341
Rep Power: 174345
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: 2,341
Rep Power: 174345
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: What is the longest wavelength of laser light you have seen?

Confirmed that I can see the dot of a 9mW 850nm laser on the wall - across the room in the dark, ~40cm away in a room with lights on (paying a lot of attention, it's easy to miss and hard to focus on).

It's faint and looks "dull red", duller than anything I've seen up to 808nm.

Now my upper limit has been limited (no pun intended) to the 850-980nm range, at least for safe viewing of the dot.

Edit: anyone knows a cheap source for lasers in that range?
__________________
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)
~462-476nm "Tunablue" by Atomic (1.5W pk)
480nm: hostless by Atomic (125mW pk)
505nm: hostless by Atomic (103mW pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (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

Last edited by Atomicrox; 10-03-2014 at 10:03 PM.
Atomicrox is offline   Reply With Quote
Old 10-03-2014, 11:13 PM #42
Hap's Avatar
Hap Hap is online now
Super Moderator
 
Join Date: Sep 2013
Location: Morro Bay, CA, USA
Posts: 8,174
Rep Power: 1008658
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, CA, USA
Posts: 8,174
Rep Power: 1008658
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: What is the longest wavelength of laser light you have seen?

Wow, I haven't even participated in this.

Well...the longest I have seen would have to be my 654nm LaserGlow pointer....ya.....um....

Edit: Actually, Freshman year in HS I was working on a project and saw a 808nm I believe or 1064nm 10 Watt laser etching a piece of wood

-Alex
__________________
635nm: Laserglow Libra 5mW *North Pole Edition*



"Open your eyes, look within. Are you satisfied with the life you're living?" -Bob Marley
"The stars should fall and the earth be riddled, imagine all your problems be seem so little, funny how the world so brittle." -Tribal Seeds
“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


Last edited by Hap; 10-03-2014 at 11:16 PM. Reason: Added longer wavelength seen.
Hap is online now   Reply With Quote
Old 10-04-2014, 08:48 PM #43
Alaskan's Avatar
Super Moderator
 
Join Date: Jan 2014
Location: Great White Frozen North
Posts: 9,173
Rep Power: 1048339
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
Super Moderator
Alaskan's Avatar
 
Join Date: Jan 2014
Location: Great White Frozen North
Posts: 9,173
Rep Power: 1048339
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: What is the longest wavelength of laser light you have seen?

The a 808nm laser, what are you actually seeing with the red dot? It doesn't appear to be that difficult to see to me, a normal red, although not much intensity. My assumption has been that the red dot isn't 808nm but some other product from the laser, was that a wrong assumption?
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
Alaskan is offline   Reply With Quote
Old 10-04-2014, 09:30 PM #44
Atomicrox's Avatar
Class 3R Laser
 
Join Date: Jun 2011
Posts: 2,341
Rep Power: 174345
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: 2,341
Rep Power: 174345
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: What is the longest wavelength of laser light you have seen?

808nm looks like 650nm to me, but far less bright and "duller". I can see it easily as well.

If the dot is full of tiny bright and dark "speckles" (interference pattern) you're seeing the actual laser and not some LED emission (don't look at the dot of the 10W laser on your sig, you'll hurt your eyes!).
__________________
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)
~462-476nm "Tunablue" by Atomic (1.5W pk)
480nm: hostless by Atomic (125mW pk)
505nm: hostless by Atomic (103mW pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (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 10-04-2014, 10:23 PM #45
paul1598419's Avatar
Class 4 Laser
 
Join Date: Sep 2013
Location: Washington State
Posts: 8,322
Rep Power: 1055059
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
paul1598419 paul1598419 is online now
Class 4 Laser
paul1598419's Avatar
 
Join Date: Sep 2013
Location: Washington State
Posts: 8,322
Rep Power: 1055059
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
Default Re: What is the longest wavelength of laser light you have seen?

I built a 500mW 808nm laser some time ago and noticed right off that when it was focused I could see a small faint dot of red collimated light. However, when I use my IR camera to focus the beam, it is a huge bright beam. My conclusion was that the 808nm laser diode output a small amount of higher frequency light along with the infrared light that I could not actually see. With an IR camera the 500mW beam is green ( a function of how the camera works ) but is much brighter than the vestigial red dot that I could see with my own eyes.
__________________
405nm Laser Pointer 45mW
405nm C11 700mW
405nm Laser Shack Pointer 80mW
Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
493nm 120 mW 501B
502nm 110 mW 501B Lifetime
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
Ocean Optics USB2000 Spectrometer
B&W TEK BTC100 Spectrometers X3
Scientech Vector S310 with AC2500 10 Watt LPM/ Hyperion 6 Watt & 20 Watt LPM/ Radiant X4 3.7 Watt LPM
paul1598419 is online now   Reply With Quote
Old 10-05-2014, 12:05 AM #46
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 2560
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Things Things is offline
Class 4 Laser
 
Join Date: May 2007
Location: Queensland, AU
Posts: 7,549
Rep Power: 2560
Things has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond reputeThings has a reputation beyond repute
Default Re: What is the longest wavelength of laser light you have seen?

Why? Cameras are great at seeing 808nm light too. However it'll show up different colours between cameras and depending on settings such as white balance.

If the laser is burning then yes, you will see the incandescent material, but the dim red dot IS the 808nm light.
Things is offline   Reply With Quote
Old 10-05-2014, 12:37 AM #47
paul1598419's Avatar
Class 4 Laser
 
Join Date: Sep 2013
Location: Washington State
Posts: 8,322
Rep Power: 1055059
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
paul1598419 paul1598419 is online now
Class 4 Laser
paul1598419's Avatar
 
Join Date: Sep 2013
Location: Washington State
Posts: 8,322
Rep Power: 1055059
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
Default Re: What is the longest wavelength of laser light you have seen?

That red dot that I can see is of a small diameter. Very small. It is also very dim, which could be explained by the eye's inferior visual acuity at that wavelength. However, since the 500mW beam is so easily seen with an IR camera and is much brighter and by extension, of greater diameter, is there an abstract you can site to give more weight to your argument?
__________________
405nm Laser Pointer 45mW
405nm C11 700mW
405nm Laser Shack Pointer 80mW
Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
493nm 120 mW 501B
502nm 110 mW 501B Lifetime
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
Ocean Optics USB2000 Spectrometer
B&W TEK BTC100 Spectrometers X3
Scientech Vector S310 with AC2500 10 Watt LPM/ Hyperion 6 Watt & 20 Watt LPM/ Radiant X4 3.7 Watt LPM
paul1598419 is online now   Reply With Quote
Old 10-05-2014, 12:41 AM #48
Atomicrox's Avatar
Class 3R Laser
 
Join Date: Jun 2011
Posts: 2,341
Rep Power: 174345
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: 2,341
Rep Power: 174345
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: What is the longest wavelength of laser light you have seen?

Do you see the interference speckles on the dot? If you do then it's coherent (laser emission, not residual LED emission).
Then you can use a diffraction grating in front of your camera to see if there is only one line. Then you'll be sure you're seeing the 808nm.

As Things said I bet you are.
__________________
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)
~462-476nm "Tunablue" by Atomic (1.5W pk)
480nm: hostless by Atomic (125mW pk)
505nm: hostless by Atomic (103mW pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (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
Reply

Tags
1064nm, 1342nm, 780nm, 808nm, 980nm





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

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 10:02 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC