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The small tube is about 1/4" x 23" long with a high impedance antenna on the side. It is excited by a 27.125 MHz 300 Watt RF transmitter which is tuned to the CO2 cavity very carefully! I don't mention safety glasses here because it is covered everywhere in this forum. However, the output...

Ahhhhhh --- Fiber lasers. Maybe soon for us hobby people! HM

Spotter Laser????? I built this in 2013 and have posted it here many times. It is a 12 watt CO2 built in a PVC housing 25" long. Powered by 8 SUPER Li Ion cells. I made it to look like a weapon from the original "Star Wars" movie. HM The small tubes hold the LiIon cells. My current project...

Portable CO2? Starwarz Gun! 12 Watts RF Excited -- 32 Volts @ 10 Amps HM

Chris -- I've got a couple DCV (-15 and -19) and a +87 PCX coming from Surplus Shed for that 808 FAP. My computer won't access their site tonight because of "certificate errors" but the lenses are on the way. I hope the double CV lenses work OK. HM PS: Are you at your "new" home now?

That's why I'm using the fiber!!! It is my protection. The one I burned may be that I blew the lens housing out with that canned stuff. Difluoroethane - It may have stayed in there and burned. I don't know but I'm not trying that again. HM

A friend of mine gave me a projector lens like that too. It is from a unit which had three lenses and a big screen on the front of the cabinet. One lens is a bit weird because I think it made the image square on the flat screen. Also, I shined my green pointer at it and the reflection was...

Chris - That's the problem I have with "your" lens Ass'y too. I built a similar housing using an SMA RF connector BUT I got a PCX lens for it and have the same problem :-( I can replace the lens in the housing I made or make another. I am looking at Surplus Shed for a small PCV lens but they...

I Know it's been a year but I have worked on other fun projects like my Phaser and NdYag. I'm now trying to get this 40 Watt FAP under control. As in previous posts, I have started using a Coherent fiber cable to smooth the 19 spots but all my previous attempts used small optical assemblies...

Re: Beam expander to focus laser bearm Another question --- Does a low or high magnification expander design make a big difference. It seems a 10x is more sensitive than 3x in focus. HM

WizardZ --- Great idea. There is also low temp bismuth solder. Flux will always be a problem here. I have a SMALL amount of bismuth solder if you need a few inches! HM

For some cutting operations, a pulsed system is used to allow ablated material to clear the beam path using the gas nozzle around the objective lens. HM

Alaskan is right because I think a similar product is used to repair rear window heater traces. It may be copper or silver. Try some on an insulator and check current capability - it might take a couple coats. HM

I think your coach was thinking blue only comes from a gas laser like Argon Ion. He's a little out of date. HM

For my high powered blues, I have a 12" square piece of 3/4" CRS. It will stop the laser but not a 50 BMG!!! HM

Night Lase -- I have a small engraver which I have modified with a 405 laser and power supply. It came with very simple software and I'm wondering what you use and if it can work on my simple unit. HM

HEY -- Losta fun stuff here but I want to get back to my YAG gun. I hope this is a good forum for this. As I said above in post 63, I built a 3.1 X expander using Surplus Shed "coated" lenses. I can get specific coated lenses from Edmonds with specific AR coatings but with my current...

Many cheap camera flash units exceed 1J. 330 V with 100 mFd cap is about 5J. That's with poor ESR photo flash caps however. HM

Paul -- The flash lamp was about 9" long and was misrepresented as a basic xenon unit. It was some type of high pressure tube. I had it laid out on the bench with only about 5 J connected and when triggered, it went POW I was wearing glasses. HM

Mine is silver and is printed DORCY - I don't know if it's a junior. How big are the tail cap threads on the junior? HM