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Now if only we could synthesize excited bromide in an argon matrix, we could have a lot of fun!

I didn't have one in mind, but the general design could be made around whatever you have available. The big problem you'll run into is in designing a good, reliable driver for the pulsed mode operation. If you intend to use LM317s, you'll probably need to connect the transistors as a resistance...

If you want to go all out and use a single adjustment, here's one option: Individual driver sub-circuits, each one tuned for a safe level max output. Each of these sub-circuits would be further reduced by a transistor. These transistors would be bias adjusted individually, and then capacitively...

Glad to see you here, KipKay. Truth of the matter is that your videos have brought more people into the hobby of lasers than most people ever will. Congrats on that. Please don't be offended by those here that constantly pick holes in everything. After having dealt with the number of scammers...

Simple answer is that they wouldn't. More detailed answer: We don't know of anyone that has managed this yet. The biggest obstacle would be in getting a reliable regulator of the right size and shape to fit. Suffice it to say, if you want to try and construct a regulator small enough to fit...

It's from both, actually. Because you had no regulator in the system, shorting the pins together (even for a fraction of a second) resulted in a sudden spike in current. When the short was broken, the flow returns to normal, but not before doing its damage in the few ns to ms time found on the...

It in itself won't protect a thing. All it does is warn you if you've made a mistake.

Here's an option for it. Create a parallel circuit in this manner: X-----+----------+ | _|_ | _\_/_ D1 / | \ | / R1 | | [LD] [LED] | | | X-----+----------+ R1: used to limit current through the bi-color LED. (Value depends on LED's operating...

Blue, the reason the LD has to be connected off of the ADJ pin is because the chip needs to use it as part of the reference circuit. Known facts about the circuit: The laser diode will try to draw more current at a higher voltage. The LM317 uses a 1.25v drop relative to Vout to determine...

That's probably a class IIIb lab laser dropped down to a 'safe' level at the target range. For a properly collimated beam, 5 miles isn't a problem at all. Keep in mind the US Military is also known for the ability to put personnel at a higher level of risk than would be even legal for...

It's quite possible, and it sounds like you've done your homework on debugging and testing lasers, too. :) You might want to consider the possibility of popping the diode out of the housing and removing the can. I've run into a few with damaged and/or broken windows, and they ran far, far better...

I suggest that you don't use a breadboard with this. Laser diodes are picky about intermittent power, and this circuit will fry the diode if the connection is broken even for a split second. Instead, bite the bullet and fully solder this one together. As far as the pot is concerned, you wire...

Assuming you had the 1-ohm resistor hooked up in series with the laser diode, you may have optical damage on it. To rule everything else out first, what input voltage and source are you using into the driver circuit?

As far as the one that didn't have a ring around it, simply solder to the case itself. That's the easy one. There are many threads here regarding opening the can of an LD. To fix the one with the broken anode, that will be the first step. You'll also need a fine drill bit to drill the solder...

What you do all depends on which pin was broken. Was this the case pin, or the anode? If it's the case pin, you can solder right to the case. If it was the anode, it'll take some tricky mini surgery to either cut open the case and connect a new wire to the other side of the pin or to build a...

I think I remember someone mentioning 1.75 in relation to the 532nm setting for the 405s, but I may be wrong.

I know I'm not in on this one, but I can't wait to see how they look! If things go well, I may be on the list for a bunch of them next time around.

If you want an LM317, ask the shirts at RS which stores are 'parts' stores. They're usually the ones not in malls. RS has them at high prices, but if you're buying a lot more, check out Digikey (digikey.com). Great prices, but minimum $25.00 order.

Now that's a beautiful beam. If only I had something called money...

That single, long line is the typical output pattern of this particular laser diode. It's generally agreed that it isn't a pleasant thing, but it is an expected artifact of the group buy diodes and their production design. It is, however, usually more diminished in comparison to the primary output.