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Any laser rated over 5 mW is illegal as gently caress here OP, which makes it a huge pain in the rear end to do holography. Technically most high power laser pointers are useless for that anyway, especially the green ones, as while they claim to be coherent, they actually aren't very. But some cheap red laser pointers can have coherence lengths of several meters even without stabilizing circuitry. Also you gotta watch out with the green pointers. They are produced by shooting an infrared laser through a frequency-doubling crystal, but the infrared laser also comes out on the other side. They are supposed to filter it out, but sometimes they just don't bother or do a poo poo job at it, and the cheap safety goggles they send may not block infrared light at all. Not only is getting hit in the eye with infrared laser light just as bad as any other color, the IR beam may even have more power than the green beam. So if you're buying some cheap poo poo from a random place, absolutely do not trust it until you or someone can measure the actual wavelengths and power it outputs. And under no circumstances wear sunglasses or welding goggles as protection you will go blind!!! With that said there is no way low power laser pointers will make you go blind even if you shine them directly in your eyeballs (but don't do this anyway) and you can mystify your pets with them all you like.
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Feb 4, 2020 13:37
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Flavahbeast posted:Are they really that damaging? I would expect to see IR lasers used as terror weapons if it was that easy to blind people with them Terrorists are in general extremely goddamn stupid, but also it's not like you can shine it in someone's general direction and hope to blind them you'd have to actually hit them in the eye. Diffuse reflections (e.g. from a laser dot on wall) can damage your eyes but you have to be pretty close to the dot as it quickly decreases in power as you get further away.
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Feb 4, 2020 15:31
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central dogma posted:What's the most powerful laser. Is there a 5 GW laser? The lasers used for fusion research are in the petawatt range, but these are pulsed lasers firing for only a few picoseconds, so the actual energy delivered is not as high as it sounds.
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Feb 4, 2020 15:46
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gary oldmans diary posted:ever since i became aware of rust-removing lasers i havent cared about any other kind They're great because they are the first laser that actually sounds like a laser https://www.youtube.com/watch?v=Q8q3DZB_l6M
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Feb 4, 2020 21:05
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He doesn't have an electrolaser gun, and it isn't the sort of thing you would want to hold when firing anyway as the bolt of electricity would need to have such high voltage it would be more likely to zap you than whatever you're pointing at. It's a simple concept, but it turns out making a viable plasma filament using a laser is really hard (among other things the plasma once formed tends to block the laser), and convincing a spark to travel through it even harder.
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Feb 4, 2020 23:03
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| # ¿ May 2, 2024 18:33 |
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Ramen Pride! posted:I'm just amazed someone hasn't tried to do it with an eBay tattoo laser yet. They have tried, it just doesn't work. Mostly because they're usually just shooting a laser through a taser spark which will obviously not do anything, even if the lasers did form a plasma filament (which they don't).
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Feb 4, 2020 23:20
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