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New 520nm 500mw Build

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Just completed a new build,

520nm, 500mw (driver set to 600ma output) buck boost driver off a single 18650.

I won the Nichia NUGM01 diode for 35$ shipped on ebay, so I absolutely had to build a new handheld solid state green laser.

Used a stainless waterproof Cree 3W flashlight host, also won for a few dollars on ebay. The LDSE500 boost driver was set to output 600ma, and all the major chips were heatsunk using thermal epoxy and copper heatsinks. Duty cycle is around 80/20 with 1m operation time, the diode heatsink reaches about 30c.



zcwFLd6.jpg

Cap negative for case negative.
DFNxeXu.jpg

Full host build, with the rocker switch.
BiPAZNB.jpg
Beam shot along with a 1050ma 638nm red build. Immediate exposure, no long takes.
HW8iDq1.jpg
 

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Yeah, I haven't modded the diode in any way shape or form, other than pressing it into the heatsink using very nice thermal compound.

The divergence isn't great, but I purposefully focused the beam to produce a fatter beam than typical. Properly focused, the dot @ 20ft actually isn't too bad. In this installation it's quite a large dot at 20ft, though.
 

LewDude

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Nicely done, and what a nice bargain for the amount of output you're getting. Thanks for sharing!!
 

RedCowboy

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Hey...Very nice. :D

I have scored a few for under 50 each as well, I have a brand new nugm03 sitting here right now and I am thinking if I can get a few more I might do a 6 beam portable and signal the :alien: :alien: :alien:
 

paul1598419

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That was a good price. Looks like you could do with a better solder station, but if everything works, it doesn't matter. I have heard that these green diodes do okay when the ball lens is removed. If that is the case, I would want to decan the diode and add my own lens to the build. Thanks for sharing your new laser.
 
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My "soldering station" is literally a stainless steel tiled outdoor bar, on a balcony, 22 floors above the city streets of Toronto. I would kill for a more pristine workstation. I downsized from a massive metal and wood workshop (forced dust collection etc.) to a city condo and it hurts.

I may look into changing or removing the ball lens, and re-can. But I have a 473nm diode coming in next, so that's the next priority.

Cheers!
 

RedCowboy

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I have been metering a ndg7475 and a nugm01 that I bought months ago and I am running it ( nugm01 ) de-canned @ 1.8a via a super X drive and 2 x 26650 cells, so far it's still doing 800mw months later, the same output as when I 1st de-canned it. The ndg7475 is also holding up just fine, I test both each time so I know my meter is reading accurately.

I power it on most days sometimes a lot, it seems like it is holding up de-canned very well so far, much better than the de-canned nubm08 I wore down to half brightness after only 6 weeks of heavy daily use, maybe it's because of the lower power that it appears to be undamaged ?
 
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paul1598419

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Which 473nm diode do you have coming? We had Sharp diodes that came out around a year ago, but they were just a small supply of diodes that failed to reach 488nm. I have one in a build that measures 477nm. It is a unique light blue color. Not nearly as light as my 488nm diode, but still very blue.
 

RedCowboy

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I mounted my new nugm03 and the factory intact GBall is focused almost perfect....almost, it's actually useable although I might pull it although it is an efficient longer FL lens.

I am getting 1200mw @ 2.0a and 1250mw @ 2.1a and that was holding steady in my heavy test heat sink pressed into a 12mm copper module, it would likely take more but 1250 @ 2.1a is not bad for holding steady. :)
 

paul1598419

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I would be curious to know how long it lasts if you decide to remove the ball lens and use one of the standard lenses we use. I am not that interested in a diode that can't be focused; or needs two extra lenses to do so. If it can survive decanned I would look for one to bid on.
 




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