Electronics > Beginners

Laser driver

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IanMacdonald:
Also since you posted in the Beginners section, I think it ought to be added that experimenting with this kind of unit is best left to those with some experience of high power optics. You need highly effective eye protection which precludes the beam or a reflection entering your eye from any angle, for a start.  8)

Raj:
I do have a Google for the specified wavelength of od 4+

janoc:

--- Quote from: jmelson on November 11, 2017, 03:58:12 am ---
--- Quote from: janoc on November 08, 2017, 03:12:39 pm ---
Eeeep! Do not drive a laser diode with a simple resistor! That will work for a short term test but it is a very poor solution. It is the best way how to turn your laser diode into a crappy LED

--- End quote ---
Well, I've been doing exactly that with an old 670 nm laser diode in my photoplotter for the last ** 20 ** years, without damage.  I don't need to push it to the maximum output level (5 mW) so it has some margin.

Jon

--- End quote ---

You do realize we were talking about a laser with 4W+ of optical output power, right? That is going to be cutting stuff. There you don't have a lot of margin between the current at which it starts to lase and current where it blows up already. Your 5mW diode from a laser pen kinda doesn't compare here.

Raj:
Don't worry guys, that's why I came here, to get my design checked by experts.
And I'll be wearing my glasses while testing it, fitting it into the air.
And when the time comes to install it on CNC, I'll have it in a room, in which I am absent, controlling via camera and motors. And still I'll eat the glasses

janoc:

--- Quote from: Raj on November 12, 2017, 11:58:08 am ---Don't worry guys, that's why I came here, to get my design checked by experts.
And I'll be wearing my glasses while testing it, fitting it into the air.
And when the time comes to install it on CNC, I'll have it in a room, in which I am absent, controlling via camera and motors. And still I'll eat the glasses

--- End quote ---

A much better idea is to build a proper enclosure for the machine, so that any stray reflections cannot escape and with an interlock/safety switch on the doors that cuts the power to the laser when opened.

Those "naked" gantry-style CNC engravers/cutters so popular on AliExpress and elsewhere are an accident waiting to happen.

It also saves you from indigestion from those glasses.

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