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Old 10-17-2012, 05:00 PM #1
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Default DIY Laser Engraving Pen using 120mW 780nm diode

Hello

I want to show you my laser engraving pen which can write on dark plastic and wood. This idea came me when I saw my 780nm laser diodes lying around which I salvaged out from DVD burners. The advantage of 780nm is the human eye almost isn't sensitive to this wavelength, but is dangerous if you shine this diode to your eyeballs (no blink effect). Other advantage of this laser project is very low cost of components (old CD/DVD burner, LM317 Voltage Regulator and some resistors/caps). It's easy to make and it's made mainly from PC scrap parts lying around.

You will need: old metal pen, focusing lens (eg. from CD/DVD burner), 780nm laser diode from CD/DVD burner, LM317, 15ohm resistor, small power supply which can provide 12V and current more than 200mA and finally freetime

You can see prototype of my laser engraving pen (sorry for poor quality, but it was filmed 4 months ago and I wasn't have a HD camera):

Laser Engraving Pen 120mW@780nm [PL]

Comment & subscribe on my You Tube channel

rafalrrrr, Rafał Rdzanek


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650nm ~260mW@420mA 16X GGW-H20L Long Closed Can red laser in 3$ red flashlight host

405nm ~60mW@90mA Blu-Ray laser from laptop BD-ROM combo drive laser in 3$ blue flashlight host

780nm ~105mW@125mA CD-Burner self-made laser pen in metal pen host


780nm ~120mW@150mA CD-Burner diode laser lighter <almost as kipkay's cheapy lighter laser burner>

Last edited by rafalrrrr; 10-17-2012 at 05:08 PM.
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