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Can 445 set white paper on fire easily?

oic0

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Asked youtube to swap the audio, if it doesnt yet, just mute it lol. I was on the phone with a friend trying to pretend I was listening.

I just got my new lens and new glasses. Wanted to see if they were good enough to keep it from reflecting when hitting a white surface (thats actually the printout reciept from my lens). I turned it on an POOF caught on fire. Went and got the camera to repeat it. Took me a second to get it focused and the first spot just went straight through. Second did what I wanted it to again.

I knew it could set black paper on fire, didnt know it would do white so easily!
Most of the video is spent with my focusing it, it actually catches fire pretty much instantly when focused well. You just cant see the dot too well because the video is shot through my ol crappy Wicked lasers goggles. I love my new ones, I can actually see the dot as a faint dim dot and easily focus it.


YouTube - P1010542.MOV
 
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ElektroFreak

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Sure it burn white paper no problem.. short-wavelength lasers are pretty indiscriminate about what color objects they can burn. Focusing the beam only makes it more intense, which pretty much guarantees that effect.
 

oic0

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Sure it burn white paper no problem.. short-wavelength lasers are pretty indiscriminate about what color objects they can burn. Focusing the beam only makes it more intense, which pretty much guarantees that effect.
I knew 405s would do it since they are short wavelength and focus down real tight. Didn't know 445 would though. I remember people being real surprised when someones set a black magazine on fire pretty quickly so I wasn't expecting the same with white paper.
 

ElektroFreak

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They'll burn just about anything that can be burned given enough time. When the object to be burned is held at the focal point of a focused beam that time frame is reduced considerably.. I haven't spent much time burning things with these diodes myself, but they're not too far off from 405nm so I would expect their performance to be similar.
 

Cenobite9

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Wow!!! Your laser reached at least 451 degrees Fahrenheit!!!
 

CrazyMonkey

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I've done paper, but I also melted solder as well. I would have assumed the reflective looking surface would have made it impossible, but I can do it pretty easily. works on both my .015 and .032 diameter. the .015 being easier of course.
 

qumefox

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The main thing I see this being a demonstration of is how crappy the WL goggles are heh. If the dot was that visible through them, then they aren't protecting your eyes very well.
 

Benm

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It may obscure what actually happens though. With short wavelengths you can char paper so it turns dark from the stokes losses. Once darkened it will directly absorb the laser output and catch fire or allow a hole to be burnt though.

Doing this with a non-flourescent white materal would prove very difficult, but most white paper has fluorescent dyes in it to make it appear whiter than white in normal use.
 




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