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Sorry, I can't help but nit-pick: near UV, like near IR, refers to electromagnetic radiation just barely outside of the visible part of the spectrum, so 405 nm is still just plain old violet, not UV-C, not near UV, nothing like that. Near UV refers to wavelengths greater than 300 but less than...

1. I'm not sure why so many people call 405 nm ultraviolet. Ultraviolet is defined as 10 nm to 400 nm. 405 nm is outside of the ultraviolet range. It's just plain old violet. 2. You could, in theory, disinfect with any wavelength of light if it was intense enough. 5 kJ/cm² does not sound...

You should be able to get a single mode, low power laser module with a focusable lens for pretty cheap. You could end up spending much more on study mounts than you would on the laser itself under these circumstances, though. If weight is a huge concern, those study mounts are going to be the...

I'm in the USA. If you have a PL530-based laser, please send me a message.

Well, there you go. Do a google search for "Laser 303 LPM output." Don't just take it from me, but those are generally 50-100 mW. The power is overstated by the seller by a factor of 10-20x, and understated by the safety label by 100x. There are no 1W lasers on the market for $10. If you...

Doves aren't the most clever birds. I'm afraid that, no matter how bright the laser is, they'll probably just stare at it as if it were a strange bug. I've seen people use those foam rubber owls or hawks, and the doves will roost right on top of them. About the only thing that seems to be...

Maybe we could start a similar thread and keep it a little more focused and see if we could get it stickied for newcomers? Depending on the quality of the thread's content, though, it could backfire.

Holograms?! I know they aren't as "cool" as they were when I was 9 years old, but they are still pretty cool. There are starter kits that are pretty easy, but then you can really dive deep into that one. Or build a spectrograph. Again, there are cheap kits available on amazon/ebay, but you...

Lasers are definitely cool. Owning lasers is cool, but with great coolness comes great responsibility, at least according to some guy who used to sell rice. But, if you have no need for a laser for any reason, you either start this as a full-on hobby, which can get semi-expensive, or you buy...

I never said it was technically impossible. It's all a matter of a general lack of interest. If executives think selling it will be a big barrier, they won't be pumping money into it. If money doesn't get pumped into it, it won't happen. Keep in mind that we are already a few times removed...

Why do you want a laser? If it's to burn stuff, a lighter is cheaper and more effective. If it is for cutting, a knife is cheaper and more effective. If it's to look at the beam, a 5 mW is much much safer than a 1000 mW. If it's for doing raman spectroscopy, a lab laser will almost certainly...

Here's an idea. Wait until night time. Then use your laser to cut the logo of your local pest control company into a piece of cardboard, then shine the laser into the clouds through the cardboard. The pest control company will see their signal and come to your house. Or just use the telephone.

It'd probably be easier to just build a HeNe from scratch. The optics, electronics, etc., will all be very different between the two, so, by the time you replace everything except the glass tube, I doubt it'd be worth the trouble. I've never personally seen a HeNe in the >50 mW power level...

Use whichever fully charged batteries are recommended. The driver should supply the correct voltage and current to the laser, as long as it's getting enough juice. If you change the batteries, you could damage the driver. The mAh is the rating of how much time you get out of the batteries...

Maybe instead of using an LED, we should use dogs. I have a yellow dog and he lazes all day long, and never gets tired of doing it. :)

That's not really how that works, though. Yes, you could calculate the yellow channel by weighting an average of the R and G channels, but that won't make it look any better than just showing the R and G channels. If you want some sort of extra colour information, which is the only way you...

Sadly not too likely. There was once a television with a 4 channel HD display. In theory, it should have been able to show much more vivid oranges, yellows, and greens. However, it could not work, because all colour information fed to the display was in RGB, so the added technology was...

That article is 20 years old. Has anyone heard any developments since then? Only 565 nm lasers I've ever seen were DPSS. To put into perspective Nakamura published his work on 405 nm diode lasers just three years before that paper.

No.

I know nothing about the large LPM's, but, I think I can partially answer just based on general LPM measurement. You do not want to measure the temperature of the hot spot (T). You want to measure the heat (Q), which is usually done either by measuring the thermal gradient along the surface of...