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That, my friend, is the question of nightmares. I can say that if temperature stops increasing, the heat transfer rate is at steady state, or 100%. But beyond that you have to treat your problem as a thermal resistance problem. If you're generating 10W, and a solid cylinder without fins, you're...

I know this is 10 days late, but Oh yea, dude. I remember doing one of those! It was one of those "500mw 405nm lab lasers" from techhood that turned out to be 300mw with a 500mw capable driver. Needless to say, I turned the pot and blew the diode so I installed a new 3.8 450 in there, using a...

O,kk, here's my opinion but bear with me, i'm a little drink, hold my beer. Your design isn't particularly good in the sense that you would want to sell it in mass production, mainly because the cut grooves are only for aesthetics. I don't thing you gave any thought to convection currents cuz as...

IMO, it wouldn't be worth it unless a material with such a conductivity only cost so much more than copper, and then you gotta take design into consideration. Thermal resistance is a great thing to minimize, but being that conductivity is a function of length, the issue is normally, "how small...

Hey there ol friend. Ya, that was a while ago. They're pretty much all hit/miss.

No way. Is it Christmas? I've been gone a super long time. 500nm is exactly what I've been waiting for. Can't wait to give my rods a show.

If anyone is going to use this in a swimming pool when they get it, make sure you wear your glasses without exception. When taking this profile pic, the water was way choppy, and the beam was dancing all over the place; it'll b the same under the surface. If you have a round swimming pool, it...

This reminds me of a time I used to sling 303's on eBay for extra laser cash. 660's, 532's, and 404's. Even with anti-static packaging, like 1 in 5 would want a refund because it was DOA. I gave them away on the LPF and nobody said they were broken. It's a funny thing because when I bought 40 or...

That's a pretty laser you got there. I hope all goes well with the sale. May I ask where you came across the box?

Stick the brass front cap in a vise and lever the battery tube back and forth while pulling out through the axis of the tube. See my 3D model in the OP for more descriptive geometry. The front cap isn't threaded to the battery tube, but it is threaded to the laser diode module, hence the module...

Oh sorry, I misread. I'm just tired

It was a multimode even before I put an A140 in it. All they can afford to put in it is C@$1o diodes, so anyone can pick up one of these and turn it into a real laser pen like back in the day (2010ish) when there were companies would would sell that kind of stuff. At least, that what I'm...

5-10mw. I do have one more of these to try that with, ... so I will ;p I connected a 18650. It looked like it dropped in power definitely to 3mw

I wasn't about to let summer pass by without one laser build. This is probably a great project for beginners looking for a really cheap laser pen just over 100mw. This will work with all cheap 445nm laser pens without risk of overdrive failure. I wouldn't choose a 1W driver for this, yet others...

One may want to legally build a 1mw 520nm green laser with a secret switch that turns it to 10 or 20mw. This would be easily done by using an LM317 with a limiting resistor for maximum power, in series with a series of resistors jumped by switches that you can turn off to decrease power. But...

seems legit. Always remember that eBay buyers hold all the power against sellers almost every time, so you can get your money back no problem if it dies or anything. Sometimes Chinese sellers don't even want you to return it, except if their base is in your country

Glamour shots!

Luckily, I had 3 filters left. I'm gonna get to work on those tonight, and I'll send you my paypal afterwards. I wouldn't want you to pay for one if it breaks or comes out bad. Are these powers satisfactory? I tested them on a constant 3.2v, so real batteries might give you lower power over some...

I got some low power chinese green laser pens. I was planning on installing filters. Most are like 5-8mw, then I got a couple 10-15mw, and 20mw, all measured past an IR filter. I could probably do them for $14+Shipping I find the >20mw ones too bright to stand close up, and took one 10mw for my...

Need more info before I can say your friend's project is dangerous and unnecessary. Is this a light show? Is this something he wants to pop balloons and show off? If it can pop balloons, then it's not something you want in a room full of people who can sue you.