Old 08-09-2018, 01:57 AM #1
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Default Driving 505 35 mW diode correctly

Hey everyone

I'm attempting to get a 505 diode working (sharp GH05030C2LM) correctly. I haven't found any specific info for this purpose so I thought I'd ask more experienced members.

I'm working on multispectral laser imaging techniques, and this wavelength is one among many that I have set up and already imaged with.

I have the actual diode (replacement), but not the original driver it came with (Lazeerer nano buck/boost) as we had a mishap with a supply.

However, I have on hand a Blackbuck 8M as well as can salvage a SXD v3.

I don't need this diode to last very long, just a day or two for imaging. However, I need it for yesterday.

Other means would be to image with what I've got (sequentially), and steal a nano buck/boost from one of my other diodes to get the 505 wavelength image.

Thoughts?

Thanks
MB


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Old 08-09-2018, 02:49 AM #2
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Default Re: Driving 505 35 mW diode correctly

That diode has a high forward voltage. That is the reason for a boost driver. It can't take much more than 350 mA, so the drivers you have will cause it to fail immediately if you supply them with enough voltage to overcome the Vf of the diode. The Nano Boost/Buck driver supplies 275 mA at ~6.3 volts. This should give you over 100 mW of optical power with most lenses. The only other option I can think of is to build a linear driver for it. You can do this with an LM317. You'll need to supply the driver with ~9 VDC and use the current sense resistor to adjust the output current. Make sure you use the control pin as the output so it will become a constant current source instead of a constant voltage source.
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Old 08-10-2018, 03:05 PM #3
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Default Re: Driving 505 35 mW diode correctly

Hi Paul

thanks for the information. While we had to proceed without the 505 due to time constraints, I will look into the option you suggested (diy driver) and stock up on driver and diode parts in the future. I will surely have to become (with or without my consent) a laser diode expert to go through my PhD.

I'll be sure to check here when I have questions. Thanks for the quick reply.

MB
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Old 08-10-2018, 07:51 PM #4
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Default Re: Driving 505 35 mW diode correctly

Good luck.
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473nm 50 mW BWB-10-OEM DPSS
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493nm 120 mW 501B
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520nm LaserLands pointer Measures 510nm
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532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
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574nm OptLaser DPSS Laser 36 mW
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