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No, secondary glow of objects caused by already diffuse reflection is safe. Just don't try to watch focused dot .. anything which gives you afterimages is stressing it. And of course, you wear goggles to prevent ACCIDENTAL hit. Problem with accidents is they are unplanned, and thus hard to prevent.

There might be no warning at all .. that's why we use torture test .. we destroy few diodes of popular types to find out where the limits are.

I guess that would be impossible. Anyway, as for me, donation is always just throwing money away. Just do whatever you seem is right to do with them.

It's just your vision being too slow. And it's not specific to lasers. Lasers are just good at producing fast moving highly visible dot.

There is actually link to the thread about the case in the very same signature :beer: Scary reading though ..

Indeed, word 'hologram' is used for anything optically weird. Projection sights also have nothing to do with holography. Basically no 3d display has, and no 'image in air' kinda of display either. Those are also usually 2D 'image in air'. Why there are no holograms anymore ? I wonder that myself ..

From what I remember here, I think somebody did a pretty nice 'pointer' with 3 9mm 445nm cans .. it hit almost 10 watts. It was huge of course, but it was handheld, and it was flashlight shape (custom host IIRC) .. bordering term 'pointer'. Can't remember battery type. But that was really...

Red are build for DVDs, 405 for bluray, 445 are build for projectors .. that dictates their parameters. That is why red and 405 are singlemode. That's why reds are most common (and cheap) in 300mW and 405 in 700mW. That's why 445 are multimode, power is more important than beam quality in...

You are getting off topic .. I mean brown lasers would be really cool. It's no laughing matter ..

It's rather unclear what you need the laser for, and why you need thick beam.

It's not possible ..

It should pass current in open direction. If it doesn't it's dead.

If it's to be VISIBLE at long range, it will have to be dangerous at short range. It's like you would want to have gun which will shoot 600m but will be harmless. It's not possible. IR will require a bit wider beam, as it has longer wavelength, but since we are talking 1 millimeter, it should...

It's not as much about diode, as about optics. You need single mode laser, that's for sure. But rest of the problem is on optics side. Generally speaking, to improve divergence of a laser, you need to increase it's output aperture size - in other words the beam must be thicker when exiting...

Hey he can always send it back ! :beer:

I would also consider this one .. Crown upgrade 400mW green laser torch/adjustable/waterproof [OL-CGL-400] - $185.99 : Zen Cart!, The Art of E-commerce

Anyway, with hobbyist lasers, you don't really operate them on hourly basis. More like seconds. Minutes per day when the laser is new. If you just burn stuff, or occasionally blast it outside, you will have troubles reaching laser lifetime. I recharge batteries in mine like once a year. Using...

Even at 200mW it's a really nice price for such host. I mean I don't really need another red laser. I don't really need another red laser. I don't really need another red laser. I don't really need another red laser ..

Direct drive is really not that simple. It can be done .. but it depends on what voltage the battery has, and how it will change with current .. and also what diode it is. Diodes have mostly linear voltage-current response (in the open direction). If you slowly increase voltage, first there...

Wow .. this host for $25 !? Looks like I'm taking one as well .. There must be a catch, there must be a catch !