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What wave lenght for white

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trickyrick

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having a hard time finding out what wave lenght would be best to burn the colour white and how strong it would have to be at about 2 ft
Thanks Guys
 





Make sense fine enough. He wants to know what wavelength laser he would need to burn a white object the best.
 
I think a nice powerful 405nm would be your best options. 445nm (blue) are actually more powerful but you can't focus the power down to a nice clean dot like a 405.

Make sure you get a good set of laser protective goggles for the specific wavelength before you try though. Close up work with white paper will be very dangerous to your vision.

I'm assuming you are talking about viisable wavelengths, so I've left out all the IR lasers.
 
Last edited:
jcranmer said:
Make sure you get a good set of laser protective goggles for the specific wavelength before you try though. Close up work with white paper will be very dangerous to your vision.
Click to expand...

This.

405nm is very dangerous, goggles is a must
 
You will probably need about 1,5W - 2W 405nm laser to burn white paper, as 405nm is the most energetic wavelength (Learned this in science class so if I'm wrong don't judge me, judge my teacher!)
 
@cube777 I wouldn't judge your teacher, but you're VERY lucky for a 405nm to reach 1W power. My 500mW one can put holes in white paper. But, you're right, 405nm has more energy per photon, however it's not really that characteristic that makes it burn better, 405nm is absorbed much more easily in most materials than other colors, and the diode itself it single-mode, which allows for a much more tight beam (higher energy density)

Everything has been covered for the OP in my (remaining two) eyes.
 
Thanks Guys
What kind of power (mw) can you get out of a blue ray burner. There are a few 405nm at 600mw on ebay. I didn't know you could get that strong of a laser from a burner. If thats correct then what keeps the laser from burning through the disk
 
The laser is on for such a short time, and the disk is spinning so fast, that everything is kept intact.

Btw, in case you didn't know, the way that disks (CD, DVD, Blu-Ray) work is that a laser makes tiny etchings on the surface that correspond to 1's and 0's.

Every wonder why the disk is warm after burning or being in the reader for a while? This is why.
 
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