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Shorter focal length lenses have a smaller beam waist. This is why cd/dvd/blu-ray drives use short focal length lenses. Visually, these lenses have a lot of curvature. However, the tradeoff is that the shorter focal length lenses will have shorter depth of focus. Achieving the small spot size...

I personally wouldn't use an 8A laser driver for a 200mA laser diode. The reason is output current ripple. Without a specification, schematics, or testing, it's impossible to know whether the current ripple is 10mA or 100mA or worse. If efficiency is not a concern, I would use a 12V boost...

Ah, I was unaware people posted it on the forums before. I guess there are no obvious hobbyist uses for it.

Very cool. I knew I couldn't have been the first to know about these. I'm surprised that there aren't more applications for this diode. Apparently it's not too difficult to drive these. Charge a capacitor and use a MOSFET to connect the capacitor to the laser diode. This module has the...

Yes, you read that correctly. 90 watts. Get it tomorrow for $23: https://www.arrow.com/en/products/splpl90-3/osram-opto-semiconductors It seems that these diodes are used for lidar and rangefinding. Any ideas what else they could be used for? Any crystals that can be pumped with this? The...

Hella jelly! That is a nice collection you have and a really nice color comparison for us. It makes me wish there were more in-between colors.

It's crazy how you can tell the color difference between them. Were they all a different color, or just a few outliers? I'm interested because even though we have wavelength measurements, I haven't heard of another diode out there where the wavelength variations are visually perceptable.

Re: Osram PLT5 488NM Laser Pointer For Sale Hi Evans, Are you offering a warranty on this? De-canned diodes are notorious for conking out as the slightest bit of dust on the die can break the laser diode. This is a tempting deal, but I am wary of purchasing something that can break so easily.

So I have been trying to convince myself that making a diode-pumped dye laser is possible using a small dye cell without circulation. With a big enough dye cell, there should be enough liquid to maintain lasing for a decent amount of time. If the dye degrades after 1000 pulses, and there are...

Hi Nikolas, I seem to have missed that post, but I see it now. To modulate the output current, you can inject a current to the FB node. The idea is that whatever current you put into the FB node, the current sense amplifier will put out the opposite to maintain regulation. The ZXCT1010 puts...

Hey styropyro, I'll gladly take a 495nm at that price!

Nikolas, I think there's a few problems with your schematic. TSC101 is a high-side current sense amplifier, and the output is not connected to anything. Also, the FB node has a DC value of 0V, which doesn't make sense. What bandwidth do you require for your analog modulation? Since the voltage...

That is precisely what Cyparagon suggested :)

Dang nice! I didn't realize there was another IC besides the 5-pin lol. I'll take a look at the schematic tonight and see if I can figure it out.

I would like to see a schematic of the flexdrive. I've been curious about how the flexdrive achieves buck/boost action with a 5-pin IC and no inversion. From there, I may be able to help!

Awesome, thanks! The article is just as helpful as I remembered! Oh, of course you'll have to heatsink the electronics. What kind of dye circulation system do you have, or are you building it from scratch?

I don't think this is necessary as long as you are circulating the dye and stay under 10W. Just as a point of reference, lots of electronic components dissipate a few watts without a problem, and that's without active cooling. I would start off without active cooling, and if heat is a problem...

I just happened to be on Laser66 today. Creative Technology Lasers - DCPCB Spec Page There's your driver! ;)

Hi DrMario, I researched this pretty extensively about two years ago. My conclusion was that it's definitely possible but would be really difficult to do. The big hurdle for me was putting together some kind of dye circulation system, and I couldn't commit to go through that work. Without...

Not sure if this helps, but it's worth noting that 16340's are about the same size being 2mm smaller in diameter, and 1mm smaller in length.