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High pitched noise while burning?

VLC18

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Sep 7, 2021
Messages
38
Points
8
I was doing some burning with my 1w 445nm laser and I noticed something.every time I would put the focal point on something I would hear a very high pitched noise. Does anyone know why this is?
 



CurtisOliver

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Jun 12, 2015
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7,445
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I've noticed this phenomena on coated steel before.
My best guess is that for best results it has something to do with laser pulsing and laser intensity. Fibre laser engravers can also produce sound on metals and certain plastic materials depending on their frequency and pulse width.
I can confirm that when I observed the phenomena, the sound originated at the material. Not the laser itself. So internal electronics wasn't responsible for the buzzing sound. It sounds like it has something to do with the photoacoustic effect.
 

kecked

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Jun 18, 2012
Messages
734
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63
Steam…..sap….some other volatile. When wood burns it releases gases which expand.
 




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