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How about using ice? Make a cylindrical cavity with oring seal to house an ice cylinder in the host. Then make an ice tray from silicone or something to freeze ice "cartridges". I would guess you could get a 1/2 hour or more continuous duty from 1/2 pound of ice .

Ok after re-reading your post I see you didnt say the people rushing the shooter should be armed. My mistake. I must have came to that conclusion because who the f*ck would rush an armed person without some sort of protection. People running at a shooter. You think this will stop them from...

I have a few question/ comments to those that think we should arm teachers or put gun drones or whatever in schools.... DO YOU PEOPLE KNOW ANYTHING ABOUT THE US EDUCATION SYSTEM? ANYTHING??? Many schools don't even have the budget for books. Who is going to pay for these measures...

Right. But look at the divergence the spec sheet gives for a 30um emitter. Its like 1.6 X 7mRad. That's gonna need some more help.

I agree with you here. Sorry, but this sounds like some NRA bullsht. I'm not for more gun laws (for one reason its too late) Im for education and honestly trying to solve or problems here in the USA. Regurgitating NRA propaganda is not the way to solve our problems IMHO. Using the NRA's ill...

I would love to get my hands on one of these lenses. Looks like further correction would be needed to get a good beam. Probably just telescope made with spherical lenses after the collimator. Building a mount would be pretty easy I think.

cd is a measure of luminous intensity. Its basically the lumens contained within a certain angle. I would really like to see the light up close. Very interested to see how they did it.

I have pulsed the original 1w ca$io diodes at aprox 10A, 20usec pulse at 5khz. Its been awhile but I seem to recall power output seemed fairly linear up to this point. From reading others research I have found power output is limited by localized heating and COD of the facet. At low duty...

My guess; its a sharp GH0637AA2G with 8mm collimator.

Not the exact same thing. I'd say its pretty good amalgamation of trussmonkey's idea of different orthogonal grinds on the front and my idea of non-spherical correction on the back. I also wonder if they exist somewhere.

I guess im not the first to think of it.... Patent US6195208 - Single aspherical lens for de-astigmatism, collimation, and circulation of ... - Google Patenten

Im saying the lens would be spherical on the output side and have a negative cylinder on the input side. The thickness of the lens and the FL of the cylinder would change the magnification and system FL on one axis only. Thereby, one element could have different magnification for each axis...

Problem would be different focal lengths in each axis of the lens. So, focus could only happen for one axis at a time. Maybe if a special lens was ground with a negative cylinder on the backside?

Re: My new 635nm 900mW - diode two pins Look at the picture of the spots on the far away building. You can see the red next to the blue.

Not sure what you app is but, a single G2 will be able to focus a SM 405 laser to a 100-200um spot no problem. If you need to get further from the emitter you could use a G2 (~4mm FL) to collimate and a second G2 downstream to focus. At the focal point you would have a very small spot <10um...

School and Gov/institutional auctions are a great place to find solid older machines. Also, craigslist. I found a mint 1930's 9" south bend lathe for $300 with tooling extra chucks etc on craigslist. Keep in mind that most auction machines will have 3 phase motors. Also, moving large...

Any updates?

I would like to try one. Where did you purchase the new diode?

Whatever... I thought the comedian was funny.

Thanks for posting. That made my day.