Recent content by bostjan

1000 mW at 200 nm? I don't think that's even doable. Maybe at a quarter of that power with a big old custom-made lab laser for a hundred thousand or more. Maybe I'm out of step, but that seems like a ridiculous request.

Yes, of course it is possible. Is it practical? That depends on the specifics of your application, which you haven't divulged. So the answer remains "yes."

Not mine, but my dad had a diode laser pointer he bought from Radio Shack in 1994. There's an outside chance that it's still somewhere in the "junk drawer" at my mom's house, but I highly doubt it's still in operable condition in any case. I never thought of that thing as "vintage" though.

I think there is a little bit of confusion in this thread. 1. Materials with very high refractive indices will slow light (by absorbing and re-emitting photons). A refractive index of 2 is very high. 4 is extremely high. A refractive index of 4 would correspond to light moving at 1/4 of the...

Hate to be the discouraging sayer of nays, but this: is daft. You're much more likely to harm your fish than the aiptasia. Just get some lysmata wurdemanni or use a chemical treatment.

Hi! I'm relatively new to holography. I've made a handful of decent ones myself with red diode lasers and red HeNe. I'd really love to be able to make some green holograms, but I can't seem to find a complete OPSL or acceptable green diode/DPSS laser for holography. I'd love to hear any...

Where can I find info on that hologram?

Buy nice or buy twice!

The paradigm shift for me was about halfway through the video, when he said that colours are defined as distinct colours when we make up a word for them. That's 100% true and that's fully the point, I suppose. But let's come back to your original statement: I think there are different...

I somewhat disagree with the last part of that. I know wikipedia says brown is just dark orange, but no. Dark orange is dark orange. Brown is dark tan. Tan is a desaturated colour. If you take RBG and you mix in mostly red light, a fair amount of green (but markedly less than red) and a...

980 nm LEDs appear invisible to me. 940 nm LEDs appear extremely dim. 850 nm LEDs, to me, are just like regular red LEDs, but less intensely bright. My 808 nm lasers are perfectly visible, even at low power. On the other end of the spectrum, I have some UV LEDs, but they are rather high...

I have a bin full of brown diodes. I'd sell you one, but, since I'm such a nice guy, instead, I'll tell you how to make one. Take a blue diode, and drive it with too much current. The blue colouration will come out of the diode in the form of smoke. Voila! What's left is a diode that is...

I don't think anyone is arguing whether or not you can develop an application of proper UVB to sanitize. It's pretty widely proven and already in practice. The gray area here comes from the fact that the light in question here is 405 nm, which is 27% longer in wavelength than the top of the...

The second battery to swap out is, IMO, the next hurdle to leap over. If everyone charges their vehicle at 240 VAC and 30A over night, and the electric grid is leaning more heavily on solar power, the mathematics just don't work out. But charging more slowly throughout the day won't be a...

That Zero looks like a lot of fun. Very cool! Not as pricey as I imagined, either, but still out of my budget. The last link, though, the alibaba one... any idea if those are anywhere near street-legal in the USA? I can't imagine $2000-$2500 is going to get you on the road without some...