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  1. DrMario

    Osram PLPVQ-940A driver question

    Why do I want to use laser? Better optical quality especially for Infrared lights. But you do have few good point though. Following the datasheet, VCSEL is already heatsunk (Cathode tab on the DFN-2 package is where I'd solder the VCSEL on the LED MCPCB heatsink pad along with Cathode pad - the...
  2. DrMario

    Osram PLPVQ-940A driver question

    Yep. Laser diodes are naturally sensitive to everything including ESD and spikes (funny enough, some lower power Gallium Nitride LEDs can be murdered this way too), I killed a VCSEL due to spikes from cobbled-together laser driver when I was younger - I didn't know better back then. However, now...
  3. DrMario

    Osram PLPVQ-940A driver question

    This is true, and I totally agree, which is why I wanted to double- or triple-check to be sure. VCSEL diodes are supposed to be more resistant to COD (Catastrophic Optical Damage) owing to the more wide laser cavity face, meaning the heat is simply spread out. In my experience, VCSEL is kinda...
  4. DrMario

    Osram PLPVQ-940A driver question

    I decided I will just gamble - I am going to use the modified Nanjg AK-47A LED driver with one AMC7135 LED driver LDO regulator deleted. It has soft-modded firmware for 15 - 50 - 100% modes (just so I can control how much Infrared light I will need for the digital camera night vision). The...
  5. DrMario

    Osram PLPVQ-940A driver question

    Another update - I ordered SJ9000 generic GoPro rip-off specifically for the all-spectrum imaging so it will be handy for viewing in the Infrared if my other cameras won't see it well. It's cheap enough to perform the hardware mod - removing the Infrared filter from the lens assembly.
  6. DrMario

    Osram PLPVQ-940A driver question

    Hey all. I got my hands on an interesting VCSEL diode (Osram PLPVQ-940A) from Digikey website for almost $10 for the DIY Infrared illuminator for some of my digital camera so I can use it for certain night shoots without disturbing anything in the dark. It's powerful for such a tiny laser -...
  7. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    It would be a nice deal, even though a bit rich for my blood - still, new Ocean Optics spectrometers go over $4,000, depending on the features.
  8. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    That's an interesting point, especially with the multimode laser diode lasing threshold. Calibrated spectrometer would be nice to have, still very expensive even used off eBay. Very hard to DIY too, even with FPGA or some fancy software on the microcontroller.
  9. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    What I did with my 520nm laser was to start at lasing threshold (which there's no laser speckle artifact in the light) then turn it up to the point the diode starts to lase which I then call it good. (However, I found out threshold to lasing power adjustment WON'T work with multimode blue laser...
  10. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    That's a relief. And I am not planning on driving it past 200+ mA, just enough for it to light up at 5 - 10mW which is good enough for the general usage (I am just going to use it as a Lithium-ion battery powered laser pointer more for the novelty purpose of collecting very rare laser diode in...
  11. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    After reading a bit more on those ~500 - 510nm laser diodes, it have made me feel uneasy as they're apparently very easy to turn into fancy LEDs... If that happens, I would be pretty discouraged because DTR's 505nm diode supply have dried up (I don't know if he would plan on getting more of...
  12. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    Since I have had nothing to do, I decided to take out my LED magnifying lamp (the battery died so I had to use another flashlight so I could be wrong here), and as you asked, I wrote down the number on the diode: SB147EC91 It was certainly hard to see through the anti-static bag however I had...
  13. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    I will look at the numbers at the business end of the aqua green laser (the exact name of the color for the curious would be turquoise), I will need to find a decent ring LED loupe so I can read the tiny laser marked numbers. I got the 20mm laser diode heatsink (I accidentally got the wrong...
  14. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    Even if Gallium-Nitride diode itself doesn't show up, Zener diode could show up in DMM because 1.5 to 2 Volts zener point is kinda required for the laser diode in order to defend that from ESD. Not all Gallium-Nitride laser diodes have that Zener diode built-in though, I wonder if Sharp 505nm...
  15. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    I see, my bad. I meant to say either batteries. And I think it's case neutral, but I will check with DMM before I attempt to solder the wires onto the diode.
  16. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    I plan on using one Lithium-ion battery at a time (after all, Convoy S2+ is a single-celled flashlight), so I am looking for boost driver to get up to 5 - 7 Volts required to light up the Gallium-Nitride laser diode, in this case Sharp 35mW 505 nm laser diode (perferably current adjustable so I...
  17. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    Rats. Should have waited a bit so I could order that driver along with the 20mm heatsink. At least I would be fine with waiting for a bit before I can buy the driver for the 505 nm diode. Any chance the 16.8mm round laser driver can handle 3.2 Volts Lithium Iron Phosphate and 3.8 Volts regular...
  18. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    I usually use Arctic Alumina ceramic adhesives when I need to maintain a near-perfect thermal interface that's permanent. Ceramic adhesives tend to have pretty good thermal transmission performance. Nevertheless, I usually use Kapton tape when I can if I need to ensure it doesn't short.
  19. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    Ouch. Gallium-Nitride laser diodes are crazy sensitive to static electricity compared to the red and IR Gallium-Arsenide diodes. I would wonder about Aluminum Nitride UV-C laser diodes as well. Nevertheless, I may look at the boost driver specs and grab the smallest one possible.
  20. DrMario

    Any LED flashlight style (center positive) 16.8mm boost laser driver?

    Guess I will have to try that - there's a bit problem though, I will have to drill the pill in the center so I can work with the diode leads as I will be gluing the top half of the laser diode heatsink atop the pill (to save on space). Still a neat idea, I will have to do that. * You drilled...




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