Dual 487 - 493nm laser flashlight

[FivosGR]

It's finally finished!
A dual Sharp GH04850B2G diode running on a simple lm317t circuit, powered by 2 18350 cells, outputting 60mw at 487nm, and when switched to the secondary boost driver, it is driven 12.5+ volts at @450ma which results in enormous wavelength shift at 493nm and 180mw of power.

The wavelength color is calculated through a diffraction grating calibrated with 532nm green so it might not perfect but the difference is really obvious (not that well for the camera though).

Also the output power is measured by an lpfstore power meter so I removed approximately 10% from the readings I got.





Here it is compared to another 491nm laser build running with a boost driver from @Giannis_TDM at 100mw
First to the left with low power 487nm and to the right full power on 493nm switch


Ik the dual alternation switch is kinda ghetto and pointy but I couldn't find a dual wiring button one


Ps: I'm member here from 2010 but I completely forgot my passwords so i made a new account
(

 

[Ricker]

Pretty sweet!!

 

[aaronnoraa]

Hey this is pretty awesome, sorry for the late feedback but I must have missed your post back when you made it. Curious why you used a boost driver instead of using a second switchable resistor (as a current set resistor on the adjustment pin) to run the lm317 at the higher current? Also curious to how that diode lasts running at such a high current, that's the most output I've heard of someone getting out of those diodes!

 

[RedCowboy]

Neat concept and build.

 

[RA_pierce]

Very cool. Do you mind sharing details about how you wired everything up? Maybe pics of the guts? I've been meaning to try something similar but was worried it wouldn't work well.
It's nice to see people are still building things!

 

[FivosGR]

I used an lm317 with an 2.8 ohk resistor.
The dual button switches the power from the 2x18350 to a boost driver that converts to 12v+ and then this voltage is driven to the lm317.
Without the boost the 8v voltage from the batteries straight to the transistor isn't enough and so it can't go more than 100mah. When switched to boost it is working at 0.45a approximately.

At this current it peaks 205mw at my lps meter. I corrected a 10% error rate.
Unfortunately a didnt keep photos of the process, but it's really simple wiring.