Recent content by herektir

The laser is for pure red light, no orange(ie 635nm and less). The rest involves quiet and a single shot.

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Hence why my pens have lived for over 4 years, drive the laser harder the less time it lasts. It's why Jack doesnt cover overvoltage when pushed with lithium primaries which i think can reach 1.7 volts when brand new. It is being overdriven at 3.4 volts.

Nimh rechargables.. no swapping out after 10 minutes, more like 45 minutes to an hour. After it dies, recharge them.

Those laser pens draw alot of current that alkalines have a tough time providing without alot of voltage sag. Alkaleaks just cannot sustain 1/2 or 3/4 amp draws for long at all. Use lithiums or nimh rechargables. I have a 4 or 5 year old 100mw pen from optotronics that lasts maybe 10 to 15...

Well i know them as 15270 also actually but thats +- thickness of the wrap and manufacturing tolerances eitherway. Are those watson batteries any good,moderately so, or actually rated 350mah?

I'm looking for decent cr2 li ion for an older 30mw green handheld i use for star pointing with my telescope. I havent been able to find many for sale at all other than sketchy ***fire batteries which i wont use anymore. Does anyone know of a source for a couple of rcr2s that arent new old stock?

Hi daguin, its been a long time since ive been to this site and im wondering what completed lasers you build. What im specifically looking for is a 650 nm 200mw+- focusable with some water resistance. Good heatsinking for 2 minute duty cycle. Power from 2 cr123 primaries. Use will be to...

It's been a long while since ive been on this site but I'm looking to buy a completed laser. 650nm, 200mw+-, good heatsinking for 2 minutes on duty cycle that can run on 2 cr123 primaries, focusable. It would be good if its water resistant to some extent. Use would be to defocus it to a spot...

If you put it through a beam expander i have no doubt that it could be seen if they were IN the path of the laser light. 100mw beam 1 mrad 1 mm diameter put through telescope 150 power properly focused is a dot( well splotch) roughly 4 feet wide at 150 miles of unknown brightness due to...

Universities typically have chemicals of that nature. Thorium nitrate, uranyl acetate etc. Not sure how you would go about actually getting someone to get you some though without getting into some sort of federal trouble.

An important difference though between a 405nm laser and a uv flashlight is the usually lower wavelength of the flashlight and that they pretty much have no duty cycle of any kind.

I was there at the small get together in fall but I'll be there for this meet as well. I am not nearly as much into lasers as many of you. Nothing to sell, nothing really to trade, but ill bring all my lasers flashlights and pocket knives as was brought last time. A low to medium power UV...

Well if there is another meet in may I'll be there barring something unforseen. Maybe have more people there this time hopefully.

On that colour test i scored an 8.