Search results

I'm getting a little better luck with an Optnext 638 nm diode. The angle of incidence is definitely an important parameter to get a feel for, and, in my opinion (at least at this point), it's easier to get a good exposure with a higher power laser over a short time than a low power laser over a...

I think it's highly unlikely that extraterrestrial life would have the means or the desire to waste resources coming here, but, if they do, it's likely similar to how the Brazilian and Indian governments deal with uncontacted jungle people by just flying overhead to observe from afar. If any of...

I still haven't seen any specifications on any lasers for sale on the coherence length, except for a 635 nm diode from LaserLands that was advertised as having a 0.3 nm peak width. I guess it's not really something people advertise or probably even bother to measure, unless it's a specific and...

Sure, why not? So... what have you got there?

Haha, probably cheaper to buy a HeNe tube than to try to acquire a laserdisc player these days. Way back, the best place to get HeNe lasers was American Science and Surplus. They had tons of old grocery scanners they sold as salvage. Usually the power on those was ultra-low, though. I regret...

Well, technically, it's not. There are 808 nm diodes capable of way more output, but that wavelength isn't generally considered to be within the visible spectrum. Also, those huge 808 nm diodes aren't manufactured to target the consumer electronics market. Anyway, the electronics shortage and...

Sure. What are you hoping to do with it, though? I've bought tons of them. Most of them are garbage-tier quality, but every once in a while I come across a good one. Most of them are obviously unbranded, but the Radio Shack ones are pretty good- not sure if they're in production anymore, and...

Hmm, looking at the schematics available online for driver circuits for the OPSL- maybe it's trivial for you guys, but it looks like a pretty time consuming project for me, and with my luck so far, I'm certain I'd just fry that $40 OPSL and then not be able to find another one, so I think I'm...

Thanks again for your help! I'll have to sign up for the holowiki forum. I'm sure I'll have a lot more questions. In the mean time, looking at that Osram 530 nm laser, the specifications look very nice but I have no experience working with (i.e. building) anything other than regular old...

Thank you. I have a ~1 mW HeNe. It's a little bit old, but it still works. I believe it's fixed focus into a line. I suppose I'll try a lens to spread the beam out over the subject and see how that goes. Wow, you're not kidding. I'm doing this as a hobby, so a laser that's >$1k is a non...

Ok, thanks. Where could I obtain a spatial filter of acceptable quality for a reasonable price? Also, could you suggest a laser that has a long coherence length, preferably at or near 638 nm for good sensitivity and visibility?

Thanks so much for the response. Yes, I've mostly worked with glass plates. I've tried one without, just to see what would happen and it didn't turn out. I'm mostly trying to get a good reflection hologram. These are mostly polymer films that don't require a separate fixing step. I do have...

It's been a long time since I posted, but I have a question that you can probably answer easily. I've been trying to get into holography and I've been struggling with a few things. I started out obtaining a 200 mW 650 nm diode laser module, a fairly beefy aluminum heat sink, some holographic...

With a class IV laser? Never.

Are you saying that the man possibly received third degree burns from (the friction of) rubbing his eye with a dirty hand? Also, the quote you gave was in reference to a copilot from another incident, and was not given to pertain directly to the ferry pilot who received "third degree burns on...

What about one of the more cyan blues. Those tend not to be too unreasonable price-wise. A 462 nm might cost you under $200 to build if you get the right source of parts. That wavelength does seem to be catching on, though. Other than 462 nm diode, 473 nm DPSS, 515/520 nm diodes, and a...

Ha! 10 W in a handheld battery-operated laser? That's funny. What's more funny, I clicked the link and saw there was another item marked as 20 W in an even smaller host. I suppose you could drive a 440 nm diode to 10 or 20 watts, but with today's diodes, that output would only result from the...

What are you hoping to do with the second laser? If you want a laser for pointing, 532nm green works well, but, as others said, the green color of the 532nm green lasers is not direct light - these lasers use a small crystal that lights up when exposed to infrared light, so an IR filter must be...

I wasn't aware of solid state lasers that lased near that wavelength. I thought maybe there were some water-sensing applications (liquid phase) that might have made this diode a little more common, but it doesn't seem to be an application for it. I also wondered if there existed a high power...

I don't think you need to worry about your laser passing through aluminium. If you want to determine the absorbance of the glass, there are a few different ways to do so, depending on what you have at hand, how much you want to spend, and how much precise you need to know the absorbance of the...