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What's the best source/resource for beam correction optics for a 405 nm laser? I'm having difficulty finding anything with a focal length more than 3-4 cm and need 13 cm.

Thanks Conundrum. Where in the circuit are you suggesting connecting the blue and red LED's?

It is wired as per this diagram: Pos is wired to the "in" pin on the LM317 while the resistors are in series between the 'out", the "adj" and the LD anode. cathode goes straight to PSU neg. It's the same circuit as on the breadboard with the addition of the diode. I was concerned that some...

Here's a pic of my setup:

I'll take a pic and post of the new driver I built for this one (moved it off breadboard to perf board). I have a big-ass heatsink on the LM317 and the LD is pressed into a 9mm heatsink module. I'm using a 25 ohm rheostat for current control in series with a 1 ohm. I measured 1.5A max out. I do...

I'm using a LM317-based current driver circuit from this post. Has worked great so far. Current and voltage are measured (as opposed to theoretical). Maybe it's the diode. I bought that batch of 5 on eBay and the first one was DOA. :banghead: Thanks for the link. I'll check it out.

So, got my 808nm laser diode up and running, but need to know what my expectations should be running this at 1 - 1.5W @ 2V? It can burn dark/black materials at the exact focal point, but not paper, wood or card stock. My 405nm etched white card stock quite nicely. Any idea where I can find a...

Yeah, but they don't own a cool motorcycle :) I'll let you know how it goes. That $44 was a bid on eBay (I thought it was a price) so I have a bid in and should know in about 5 hours if I have a set or not.

Well, just ordered my 9mm diode housing w/glass lens and 808nm safety goggles from O-Like. I've bought from them before and apart from dreadfully slow shipping, they provide good stuff. I'll know later how my eBay bid for a set of 5 808nm's went :)

Just spotted a lot of 5 808mn 1W diodes for $44 or a 3W for $60. Are there IR safety goggles, and can it be seen using a CCD/digital camera? Also, does the burning performance of a 1W IR differ from a 1W blue (apart from materials differences), or is the power output and therefore the burning...

Yes I've been using reds without issues and that was why I was confident with my circuit. I have a CNC engraving project and need a better burning laser. i thought a 405nm would be a good choice (now I'm wondering about that). I have to laser etch a melemine surface. I have an '83 Yamaha Vision...

Hi Drew, I would think that an ammeter in series at the output of the circuit (after the resistor) can't increase the current above that of the circuit and therefore couldn't harm anything. (?) I too am concluding that I got a bad diode. Darn. These puppies are not cheap. Yes, my handle comes...

Yes, I was afraid of that. I had read though of some diodes that overheat and then recover somewhat, but had guessed it was toast. What I really need to determine is what was the cause of the failure so that I don't fry any more of these diodes. I calculated the resistor to give me my amperage...

I bought a SF-AW210 405nm diode and was running it off my LM317 power supply. I have been running my harvested DVD 16x burner laser diode in this setup for ages. Anyway, it was performing brilliantly in a heatsink, glass lens case, running at a measured 160mA at 7.5v. Then it simply turned into...