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Old 06-01-2008, 09:23 PM #1
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Default White flashes with Red laser

ok, i know there is a video from a member that showed white flashes with a red dilda, i tried it myself with my dilda

but WHY does it happen? do our eyes perceive white because of an enormously high concentration of colour?


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Old 06-01-2008, 09:28 PM #2
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Default Re: White flashes with Red laser

its not because of the enormously high concentration of colour.That only happens with a camera.Hows this
http://www.laserpointerforums.com/fo...m=1204963819/0
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Old 06-01-2008, 09:51 PM #3
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Default Re: White flashes with Red laser

When you are burning wood(not with laser, lol) with a format of bunker and put another wood in the middle you can see the wood sometimes becoming white.

I guess its not related to the diode.
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Old 06-01-2008, 10:56 PM #4
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Default Re: White flashes with Red laser

Something interesting, is that when i'm burning with my 6x blu-ray, I get weird PINK flashes. Crazy!!

No idea on why, other than I think it has more to do with the material that is burning rather than the laser light itself.
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Old 06-01-2008, 11:12 PM #5
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Default Re: White flashes with Red laser

I heard that it's because you are heating up the material like an incandescent light filament causing it to emit light. It only happens when you have the laser focused down to a tiny pinpoint.
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Old 06-01-2008, 11:21 PM #6
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Default Re: White flashes with Red laser

Quote:
Originally Posted by jamilm9
its not because of the enormously high concentration of colour.That only happens with a camera.Hows this
http://www.laserpointerforums.com/fo...m=1204963819/0
it's not because of the camera, i could see the white flashes with my bare eyes..
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Old 06-02-2008, 02:49 AM #7
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Default Re: White flashes with Red laser

Quote:
Originally Posted by nikokapo
[quote author=jamilm9 link=1212355402/0#1 date=1212355684]its not because of the enormously high concentration of colour.That only happens with a camera.Hows this
http://www.laserpointerforums.com/fo...m=1204963819/0
it's not because of the camera, i could see the white flashes with my bare eyes..[/quote]
Same here... bare eyes
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Old 06-02-2008, 08:47 AM #8
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Default Re: White flashes with Red laser

I've seen it (with my eyes + goggles) with a YAG-laser (1064nm, 25W) and it makes a VERY bright incandescent glow. That's pretty cool, because the laser it self is invisible.
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Old 06-02-2008, 04:36 PM #9
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Default Re: White flashes with Red laser

cool! didnt know that you could do it with a laser which is invisible to the human eye

but still, why does this happen?!?!?
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Old 06-03-2008, 09:30 PM #10
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Default Re: White flashes with Red laser

jamilm9 was saying that only camera sensors become oversaturated and see white instead of colour, not that the white flashes are only visible with a camera.Most of us have seen the white flashes.These were disscused in kenom's thread.There were 2 major theories: incandescence or plasma.We concluded it was incandescence.But there is a 3D scanner(also posted about in kenom's thread) that uses 2 stepper motors , another mottor for ultra fast focusing(adjusting the focal point) of a high powered pulsed YAG laser that makes tiny plasma balls(that look like white flashes) in thin air to project a true 3D image. :P
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Old 06-04-2008, 01:07 AM #11
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Default Re: White flashes with Red laser

Quote:
Originally Posted by Switch
jamilm9 was saying that only camera sensors become oversaturated and see white instead of colour, not that the white flashes are only visible with a camera.Most of us have seen the white flashes.These were disscused in kenom's thread.There were 2 major theories: incandescence or plasma.We concluded it was incandescence.But there is a 3D scanner(also posted about in kenom's thread) that uses 2 stepper motors , another mottor for ultra fast focusing(adjusting the focal point) of a high powered pulsed YAG laser that makes tiny plasma balls(that look like white flashes) in thin air to project a true 3D image. :P
ok, if it is incandescence, WHY does it happen (i dont really know the exact definition of incandescence)
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Old 06-06-2008, 04:13 AM #12
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Default Re: White flashes with Red laser

incandescence is a object emitting light because of its heat, heating elements use this effect but mostly emit ir whereas a bulb emits whitish light because of the much higher temperatures that pinpoint of a laser is damn hot and so incandescent aswell the best object for this is graphite becuse of its colour and ti wont really burn much
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Old 06-07-2008, 12:14 AM #13
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Default Re: White flashes with Red laser

I think heating elements heat up your house through direct thermal contact and heat transfer with the air in the room, not through blackbody radiation. :P Anything and everything(as long as it's temp is not 0K ,I would guess) emits IR.
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Old 06-07-2008, 07:03 PM #14
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Default Re: White flashes with Red laser

I agree, black body radiation isnt what causes it..


i'm guessing as a camera lens can saturate, our own eyes can saturate too.

i cant really compare it to something else because we dont see 200mW of red light focused on a <1mm spot at 15cm of distance everyday :
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Old 06-07-2008, 11:34 PM #15
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Default Re: White flashes with Red laser

Quote:
Originally Posted by Razako
I heard that it's because you are heating up the material like an incandescent light filament causing it to emit light. *It only happens when you have the laser focused down to a tiny pinpoint.
Exactamundo! I've recently been having to focus a red laser to a very very fine <50micrometer spot to burn into nanotube forest. The spots too small for my eyes to tell the difference, so the only way I know I've got it right is when I start seeing whitish-purplish flashes on the forest.

http://en.wikipedia.org/wiki/Incandescence
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Old 06-07-2008, 11:55 PM #16
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Default Re: White flashes with Red laser

What are you burning into the nanotube structure for?
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