Old 03-08-2008, 08:10 AM #1
Kenom's Avatar
Class 4 Laser
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Kenom Kenom is offline
Class 4 Laser
Kenom's Avatar
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Default 250mw red to white flashes.

we've all commented how when a red laser is focused perfectly you get white light. Nobody really knows what causes it but the most popular argument being that your eyes become over saturated with light. Well, I was playing tonight and saw it even through my laser shades, so I figured I'd film it. Here it is.

http://s270.photobucket.com/albums/j...nt=flashes.flv


Kenom is offline   Reply With Quote


















Old 03-08-2008, 08:20 AM #2
yobresal's Avatar
Class 3B Laser
 
Join Date: Nov 2007
Location: Napa, CA, USA
Posts: 4,923
Rep Power: 652
yobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond repute
yobresal yobresal is offline
Class 3B Laser
yobresal's Avatar
 
Join Date: Nov 2007
Location: Napa, CA, USA
Posts: 4,923
Rep Power: 652
yobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond reputeyobresal has a reputation beyond repute
Default Re: 250mw red to white flashes.

Love the vid. I just tried the same thing. I am clearly seeing some white light when I get the laser focussed all the way down. I bet you wish you had those goggles on you instead of the camera. That white dot is intense.
__________________
Looking for 445nm diodes? modules? drivers? lenses? Contact DTR!!!! He is the man.
https://sites.google.com/site/dtrlpf/home
yobresal is offline   Reply With Quote
Old 03-08-2008, 03:46 PM #3
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: 250mw red to white flashes.

I get that too....Even get some purple-ish flashes when I burn some black rubber.Maybe the material is so overwhelmed with energy that it turns to plasma? :-/ Do you guys only get this with red?
Switch is offline   Reply With Quote
Old 03-08-2008, 03:59 PM #4
FireMyLaser's Avatar
Class 3B Laser
 
Join Date: Jan 2008
Location: Sweden
Posts: 3,059
Rep Power: 6581
FireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond repute
Send a message via MSN to FireMyLaser
FireMyLaser FireMyLaser is online now
Class 3B Laser
FireMyLaser's Avatar
 
Join Date: Jan 2008
Location: Sweden
Posts: 3,059
Rep Power: 6581
FireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond repute
Send a message via MSN to FireMyLaser
Default Re: 250mw red to white flashes.

Maybe when focused it makes allot of heat. Heat=IR which the camera can see as white?
__________________
Niko likes cereal.
FireMyLaser is online now   Reply With Quote
Old 03-08-2008, 04:11 PM #5
styropyro's Avatar
Class 4 Laser
 
Join Date: Jun 2007
Location: Carbondale, IL
Posts: 5,348
Rep Power: 201029
styropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond repute
styropyro styropyro is online now
Class 4 Laser
styropyro's Avatar
 
Join Date: Jun 2007
Location: Carbondale, IL
Posts: 5,348
Rep Power: 201029
styropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond reputestyropyro has a reputation beyond repute
Default Re: 250mw red to white flashes.

My 100mW 780nm laser does the exact same thing, it makes flashes of white light when you find the sweet spot.
__________________

Always protect your seeing balls!
styropyro is online now   Reply With Quote
Old 03-08-2008, 04:18 PM #6
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,623
Rep Power: 210024
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 offline
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,623
Rep Power: 210024
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: 250mw red to white flashes.

It IS just heat, nothing special about it. When you focus 200 mW of light on a tiny spot on that cigarette, that part just heats up to the point of thermal emission. The goggles make this visible on camera, as the red light is blocked out for the most part and thus the blackbody radiation of the target becomes more visible.

I think you'd find it very difficult to reproduce this effect using for example a black anodized heatsink as the target - it just doest heat up enough.

The effect has nothing to do with 'overloading' your eyes, the inner workings of the eye are such that you will always see red as red, all the way up to the point where the intensity will damage your eyes. This is completely different from a camera, where it is quite usual to overload the sensor and make the dot look white with a red corona around it.

Benm is offline   Reply With Quote
Old 03-08-2008, 04:47 PM #7
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: 250mw red to white flashes.

But this isn't just heat....It's white light! you can see it with your eyes , not only the camera.
Quote:
This is completely different from a camera, where it is quite usual to overload the sensor and make the dot look white with a red corona around it.
Actually I kinda see my red dot on a white wall the same way with bare eyes.It kinda has a white or orange center....but maybe that's just the way really bright red looks like :-/
Switch is offline   Reply With Quote
Old 03-08-2008, 04:54 PM #8
Class 3R Laser
 
Join Date: Sep 2007
Posts: 1,591
Rep Power: 97
toked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond repute
toked323 toked323 is offline
Class 3R Laser
 
Join Date: Sep 2007
Posts: 1,591
Rep Power: 97
toked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond reputetoked323 has a reputation beyond repute
Default Re: 250mw red to white flashes.

yea its not IR because the human eye can see it, it also meens its focused to burn like hell
toked323 is offline   Reply With Quote
Old 03-08-2008, 06:44 PM #9
Kenom's Avatar
Class 4 Laser
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Kenom Kenom is offline
Class 4 Laser
Kenom's Avatar
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Default Re: 250mw red to white flashes.

Quote:
Originally Posted by Benm
It IS just heat, nothing special about it. When you focus 200 mW of light on a tiny spot on that cigarette, that part just heats up to the point of thermal emission. The goggles make this visible on camera, as the red light is blocked out for the most part and thus the blackbody radiation of the target becomes more visible.

I think you'd find it very difficult to reproduce this effect using for example a black anodized heatsink as the target - it just doest heat up enough.

The effect has nothing to do with 'overloading' your eyes, the inner workings of the eye are such that you will always see red as red, all the way up to the point where the intensity will damage your eyes. This is completely different from a camera, where it is quite usual to overload the sensor and make the dot look white with a red corona around it.
Well, I don't know if I agree with the IR from heat explanation cause I can see it with my naked eye. however, I was UNABLE to produce the effect on a black heatsink as you suggested. so your explanation has merit. I believe that this is from intense heat from the laser that part I can believe and I certainly am not arguing with you not having the knowledge to form a hypothesis.
Kenom is offline   Reply With Quote
Old 03-08-2008, 07:22 PM #10
FireMyLaser's Avatar
Class 3B Laser
 
Join Date: Jan 2008
Location: Sweden
Posts: 3,059
Rep Power: 6581
FireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond repute
Send a message via MSN to FireMyLaser
FireMyLaser FireMyLaser is online now
Class 3B Laser
FireMyLaser's Avatar
 
Join Date: Jan 2008
Location: Sweden
Posts: 3,059
Rep Power: 6581
FireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond repute
Send a message via MSN to FireMyLaser
Default Re: 250mw red to white flashes.

Yeah this is weird.
Well, when I was at my dads work, he tested a 25w, 1064mn laser burning some paper and wood. When it burned the wood was like a firework-fuse. The light is invisible, but i could clearly see that mysterius white light and the sparks flying from it.
__________________
Niko likes cereal.
FireMyLaser is online now   Reply With Quote
Old 03-08-2008, 07:26 PM #11
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: 250mw red to white flashes.

I still think it's hot ionized matter due to a lot of energy in little time on a small spot.
Switch is offline   Reply With Quote
Old 03-08-2008, 08:19 PM #12
Class 2M Laser
 
Join Date: Jan 2008
Posts: 606
Rep Power: 16
clwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the rough
clwatkins10 clwatkins10 is offline
Class 2M Laser
 
Join Date: Jan 2008
Posts: 606
Rep Power: 16
clwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the rough
Default Re: 250mw red to white flashes.

ya, ive noticed that too, its weird, ive always assumed that it was because there is so much red light that it appears white, kinda like how some stars seem white even though they might be a yellowish orange :-? just an idea...
clwatkins10 is offline   Reply With Quote
Old 03-08-2008, 09:25 PM #13
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 14
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 14
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: 250mw red to white flashes.

Benm is correct but didn't say the word.. *The effect is "incandescence".
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 03-09-2008, 03:03 AM #14
Switch's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Switch Switch is offline
Class 3B Laser
Switch's Avatar
 
Join Date: Dec 2007
Posts: 3,327
Rep Power: 2795
Switch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond reputeSwitch has a reputation beyond repute
Default Re: 250mw red to white flashes.

Quote:
Originally Posted by clwatkins10
ya, ive noticed that too, its weird, ive always assumed that it was because there is so much red light that it appears white, kinda like how some stars seem white even though they might be a yellowish orange :-? just an idea...
That can't be right since it passes through goggles.

Quote:
Benm is correct but didn't say the word.. The effect is "incandescence".
Are you sure? No plasma? :'(
Switch is offline   Reply With Quote
Old 03-09-2008, 03:08 AM #15
Class 2M Laser
 
Join Date: Jan 2008
Posts: 606
Rep Power: 16
clwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the rough
clwatkins10 clwatkins10 is offline
Class 2M Laser
 
Join Date: Jan 2008
Posts: 606
Rep Power: 16
clwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the roughclwatkins10 is a jewel in the rough
Default Re: 250mw red to white flashes.

ya, the plasma thing makes more sense
clwatkins10 is offline   Reply With Quote
Old 03-09-2008, 05:55 AM #16
Schrecken_Licht's Avatar
Class 2M Laser
 
Join Date: Feb 2008
Location: Maryland, USA
Posts: 573
Rep Power: 33
Schrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond repute
Schrecken_Licht Schrecken_Licht is offline
Class 2M Laser
Schrecken_Licht's Avatar
 
Join Date: Feb 2008
Location: Maryland, USA
Posts: 573
Rep Power: 33
Schrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond reputeSchrecken_Licht has a reputation beyond repute
Default Re: 250mw red to white flashes.

I've not seen it with my 173mw red, but I have seen it with my CO2 laser. On certain materials (generally a focused beam) the target will glow white-hot like the filament of a clear 150 watt light bulb - almost too bright to look at comfortably (for CO2 lasers all you need are ordinary plastic safety goggles and while they fully block the CO2 wavelength they don't of course block visible light at all).
__________________
Ultimate Laser Destruction! http://www.youtube.com/watch?v=wEaB7rwnyZc
The Beast: http://www.youtube.com/watch?v=0xl4c1B5Kao
Schrecken_Licht 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

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 08:01 PM.


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