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Forgive me but it just seems very... inefficient. Even if it somehow does work theoretically.

So umm... what exactly are you trying to do here? From the way I read it, you are trying to build an IR laser for $>100 which can project a spot onto the clouds visible in a 1km radius?

WickedLasers has a pretty bad rep on these here forums. I don't have personal experience with them, but they're supposed to be generally underspec (putting out less than advertised) and have terrible shipping. There's some truth in that, I guess, but WickedLasers is accepted to have some nice...

Where'd you get it? Most cheap 1mw greens are overspec to some degree. From what you've described it as it sounds like a 5-10mw green one. Cheaper to produce, you see. Easier to manufacture 15mw modules and market them as 1mw, 5mw, 10mw, 15mw and 20mw even though they're all 15mw. Are you sure...

Sounds like mode shifting. At first I thought it was just the batteries, because rechargeable batteries can have a bit of a weird power output where they peak and drop immediately after. Personal experience here. RA_Pierce is right about the temperature thing. DPSS lasers are pretty sensitive...

You'd be looking for neodymium doped YAG, and KTP. Pumping the first with your 808nm laser diode would give you 1064nm IR light which would be doubled int he KTP crystal to give 532nm green. Don't you just love wikipedia? :D And what Wolfman said. I think eyes are sensitive down even into...

I'm new too :D so I suppose I'm not exactly qualified to shake my finger at you. But I have personally seen a high-powered blue laser that was at least 800mw. And let me tell you, if you're wanting 1W+ for visibility, 50mw of green is already insanely bright and more than enough for you to see...

While you're talking about whether 1mw would last through fog/be sufficient to trip the photcell: Have you considered the divergence? From the sound of it, you're building a triangle which covers approximately an acre of land. 1100' (is it feet?) is the distance given. That divided by three is...

One of the first things I ever did with a laser was to pull out the module from a cheap red laser pen haha. I see you've already done that so. You'll want to connect (isn't it the negative? for the most part the spring connects to the negative lead) the 'positive' cable to the spring and the...

Thanks for the reply! Yes, it seems that glasses of some sort will eventually be necessary. I'll definitely check out Fasttech, and probably'll end up purchasing from somewhere other than DX or aliexpress. Generally the biggest problem with purchasing from Australian sources are the prices...

haha! thanks, I already have :yh: EDIT: well that didn't make much sense. i was replying to Greenlander haha. Thanks pyro!

Hey people! It's often said that you shouldn't judge someone by their post count, but in this case it'd be fair to, seeing as I'm a complete newbie. So, I've always been fascinated by lasers and light of any sort, and I've finally decided that I want to, well, assemble more than build a laser...

Hi! new member! Like everyone else in this subforum I guess. Anyway, I'm from downunder, and have sort-of-lurked for a short while. Nice to finally make an account!