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First: great build ! But it really suffers on the optics side. The main problem is obviously the final lens. It seems to reflect too much, and who knows how much is absorbed in it. Could you measure single beam before and after ? It would be great to have something better. Like curved mirror...

IMHO in Predator there were no actual lasers. First it clearly doesn't look like real lasers. Also if they were supposed to be clearly visible in daylight, in jungle, they would have to be of unsafe power.

$50 ? Wow ..

Well .. you won't get white from blue by FILTERING. But you can get white from blue by turning some of that blue into orange by means of photoluminescence. I have nice orange box at home, which does almost perfectly this. You shine 445nm at it and the dot on it is clearly white, as well as...

That chunk is rad though .. no pun intended :umbrella:

In other words .. how to transport large amounts of uranium over border ? Sell it on ebay 5 marbles per package :-D

Re: Uranium marbles I can recommend this site: anythingradioactive home Their supplies vary time to time, you can always just ask, if they don't have exactly the thing you are looking for.

Re: the lowest power laser can kill the Mosquito That's just mean. It's not mosquitoes who kills. It's malaria ! Those poor little lasses hardly mean anything wrong. They just need teh blood for their little ones. What we need is vaccination for mosquitoes. Healthy mosquito is no threat ...

I have some O-like lasers, there was never any problem with them, and they were on specs, even green ones. It has been few years back though. Also I don't know this model.

Hey .. you should use goggles with starting at 445nm dots .. and secondary luminescence in the goggles should make it pretty easy to focus to.

They vaguely mention 'kilowatt IR laser'. What I find nice is how precisely they can control the focus point. I would expect this to use several beams, which would intersect in one spot. But this seems to be single beam. You don't need to precisely align individual beams like this. I guess it...

Sorry if it's being re-posted. https://www.youtube.com/watch?v=GNoOiXkXmYQ Looks pretty basic so far, but pretty legit. Colors could be impossible to achieve, but it's a start ..

That doesn't sound very normal .. while I don't recognize the symptoms, I hope you had it checked by professionals.

It wont work well .. the laser would be at steep angle .. the way I see it 45 degrees at least. So it will be rather sensitive to banking of the tractor and terrain irregularities. This setup would only work well, if the laser were shining straight down, from some long arm. And in that case, the...

5W handheld is possible, but it would look a lot different. These hosts usually have around 1W. Maybe it might be pushed to feed single 9mm can (up to 3W), but only for very short duty cycle times. 5W has to be multi-diode, multi-battery, with large heatsinks. In other words .. it's just another...

If you need 'just visible', get the cheapest possible 1mW red pointer .. it might just as well work ..

Wasn't there some nuclear bomb pumped gamma laser for star wars program ? Or was it just a idea ?

Well for gamma rays (and x-rays, see above) the optics are totally different. It pass through glass without interacting with it's electrons .. so it does not refrect the rays in common way. It's quite interesting topic: X-ray optics - Wikipedia, the free encyclopedia

I agree. The burning power would be similar to blue light. But it will have the bonus of possibly causing cancer in the future. Now 'how much' will be pretty hard question, as there is no clear agreement on it for any kind of ionizing radiation.

Well .. I guess it does not sell well, now when more and more countries regulates handhelds. To convert a lab into a handheld is firmly in hands of real enthusiast .. with a little help of this community. And if it means stupid idiots won't get their 500mW easily by clicking few buttons, I have...