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A 5 mW DPSS 532 green is fairly visible from 200 yards. Probably not worth bothering from 500 yards, though. A 30 mW would be visible, but 1.5mrad of divergence from 500 m away would be a light almost a meter wide, so what's the point?

CurtisOliver already answered perfectly. I just wanted to add that this is the reason why the sun is red as it sets, and partially the reason the sky is blue. Blue light scatters. A white light (the sun) looks red when it passes through a thicker layer of the atmosphere (like the low angle of...

How much would a new pair of eyes cost?

Why would this need to be a laser? You could just use a broad spectrum tungsten lamp and then sweep across wavelengths with a prism or a grating to find the ideal visibility for whatever diagnostic you want (assuming there is such a wavelength), then see if there is a light source that emits...

Skin is more opaque to bluer light than it is to redder (or more infrared) light. There would for sure be some resonant frequencies along the way. High intensity light can damage tissues, though. Short wavelength light can damage DNA and cause cancer.

Hi Steven. Have you tried to contact the seller? I don't know much about these lasers, other than that they are advertised as TEM00 at 5000 mW, which seems very difficult for me to believe is correct. IF the laser driver does not have reverse voltage protection, it is possible that inserting...

Get a wrist strap or a lanyard or a good case or else just don't let your butterfingers friend touch it.

I think the trouble is that, with our current expectations, a cassette of this material would weigh 300-400 lbs. I don't see anyone changing those out themselves or changing those out at a "gas station" in just a few minutes. It'd be a major undertaking. Also, if deuterium poisons the...

Oh cool. I've never touched anything with that kind of power, but I work a lot with FBG. Are you recording the FBG yourself or are they prewritten? What are you measuring with the FBG? What sort of fiber are you using? Why are you using so much power? There are tons of considerations, but...

That's really neat. I know people tend to get excited about hydrogen as a power source, but it's really just a storage medium for power generated elsewhere. Hydrogen is not naturally present anywhere on Earth, although it is the product of various natural reactions, it generally has to be...

Do you mean getting different wavelengths from a gas laser or using crystals to drive an overtone? I guess I don't really understand the question. What is the end goal?

It depends. Direct diode lasers are super efficient. Still, don't count on them outputting (much) less heat than light. Blues and greens are less efficient than reds and infrareds, as a general rule, and the higher the power rating, the lower the overall efficiency, generally. Also, driving...

Well, you don't want to block all visible light, otherwise, just build a metal box over your head. You'll need to know the actual wavelengths of the individual components of the full color laser. For example R-650 nm, G-520 nm, B-450 nm, then get a pair of glasses that is safe for those...

If you see one for cheap, it's a scam. There are no mass-produced yellow DPSS assemblies, therefore, the only options are custom made.

With any measurement, there is a tolerance, but 1050 ± 150 nm seems more like an umbrella statement covering multiple products than a measurement tolerance. Have you done a search on the product? What is the make and model? Something like the Lightweld 1500 has a dominant output wavelength of...

I have some experience with this topic. The idea was not to fully ionize air with a laser, but to rather promote dielectric breakdown of air using light. So, create a large difference in charge between two objects, just below the point where the air in the gap between them would breakdown, and...

That's correct. Lasers, or any light sources or that matter, mix by addition. Typically, to make a white laser beam, a red beam (650 nm, typically), a green beam (usually 532 nm, sometimes 520 nm), and a blue beam (typically 450 nm) are combined with a dichroic cube into a white beam. Since...

1. First and foremost, without knowing the wavelength that the welder is outputting, there are absolutely no guarantees. I'd say that the most important thing would be to look up the make and model of the welder and ascertain the output wavelength. 2. Thorlabs' response seems to be valid for a...

Wattage equivalent in what sense? 1 W is equivalent to 1 W, of course. Without telling us what you are asking, the answer is trivial.

Rough translation: @Dennis63 : Hello all, I have a question, I'm still quite unfamiliar with lasers or laser pointers, now I have a Gatling laser pointer acquired from an acquaintance (blue 21 cm) here. There were also 2 G-2 lenses with it. I was immediately very excited when I tried it, and so...