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White flashes with Red laser

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nikokapo

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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?
 





N

NovoRei

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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.
 
GooeyGus

GooeyGus

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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.
 
Razako

Razako

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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.
 
FireMyLaser

FireMyLaser

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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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nikokapo

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

but still, why does this happen?!?!?
 
Switch

Switch

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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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nikokapo

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Switch said:
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
Click to expand...

ok, if it is incandescence, WHY does it happen (i dont really know the exact definition of incandescence)
 
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tomcat

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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
 
Switch

Switch

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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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nikokapo

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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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pseudonomen137

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Razako said:
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.
Click to expand...
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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