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Old 03-02-2017, 12:10 AM #1
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Default How to power a 5mW green laser with the least bulk?

I'm intending to buy a 5mW 532nm laser diode to use in pretty small housing(unconventional, not at all like a pointer), but all the ones I've seen for a reasonable price require 3V to function. Should I just buy a laser pointer, dissect it, and use the power supply from it, or is there a better way?

For that matter, will a simple 3V watch battery work for this purpose? How would I go about powering the diode with it?



Last edited by WhiteFang; 03-02-2017 at 12:17 AM.
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Old 03-02-2017, 12:43 AM #2
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Default Re: How to power a 5mW green laser with the least bulk?

Some more details about your project might help us give you more information.

FYI - 532nm is DPSS, so not just a diode, although it does have a pump diode.

Those 3V modules may run at a somewhat lower voltage, maybe down to 2.5V or so but how well it works will depend on the driver. The pump diode only needs ~1.8V but you need a constant current driver to drive it properly and prevent damage, that bumps your supply voltage up some due to the requirements of a linear driver. I.e. the input voltage needs to be higher than the output. Not sure you'll get a boost driver that goes any lower, at least not off the shelf.

A coin cell may not be able to provide enough current either, not sure what sort of currents they are rated for typically...
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532nm | Gearbest JD.850 Pointer | 30mW Metered (I think, need to re-test).
633nm | HeNe | 6mW
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2

Last edited by diachi; 03-02-2017 at 12:44 AM.
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532nm 5mw, green laser diode, laser diode, power supply





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