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I got 6 right, but they are pretty random questions about lasers of all kinds, so i'd be surprised if anyone got a 9 or 10 score on this unless having a educational background in lasers. Then again questions like the year of in invention of the diode laser are not that relevant to know to the...

It's quite possible that a back reflection damaged the laser diode indeed. If it's worth an effort to repair it is dubious - i'm not sure what you paid for this laser pointer, but it looks like a fairly generic model that would not cost over $25 or so. It mostly depends on your experience...

It differs by compound indeed, both the absorption wavelength and the emission wavelength. I suppose things in orange plastic objects are azo dyes, and they will probably take in green light and fluoresce orange (or red) if exposed. It's comparable to how you can light up green glow in the...

It's a pretty neat feature, and doesn't require a lot of power. It does require a single mode laser and good optics though: In the video example a particle of (presumably soot) is captured in the 'waist' of the beam: the part where it is most narrow and optical density is highest. I've tried...

Oh gosh, so many things going wrong there. The sunglasses are a big fail obviously, and they actually look like ordinary sunglasses, not laser protective eyewear that they just call sunglasses for the show. With a laser outputting a couple of watts a beam stop and not waving it around in...

It's your eyes and brain doing this, so a camera cannot capture what you are seeing. The human visual system as a sort of auto-white-balance system, which is useful because you want to see the color or things under different conditions like full sunlight or overcast days. This is an...

Who knows how long it will take ;) The melting point of aluminium is not -that- high, depending a bit on the alloy but in the order of 600-700 celcius. That's a big step up from the temperatures for plastic, but low enough to theoretically create extrusion style printing heads from steel and...

Most explosives can become dangerous under certain conditions. I don't think it's the perchlorate itself that's responsible for that, but contaminants in it like chlorates could be. For building fireworks they probably don't use pro-analysis grade chemicals, so who knows what's actually in there...

Good to here the issue is gone after restarting your phone - it could have been some caching info. I'm sure if this happens to a large number of visitors we'll hear more about it, but sometimes you get a fluke like this which is impossible to reproduce as a website developer... It happens from...

Afaik it's used as a binder indeed, but it is definitely also a fuel with KClO4 as the oxidizer. If you need to get perfect stiochiometic mixtures you should als add some more KClO4 to burn the dextrin, though at 2% this will not matter all that much. But for most part, be very careful with...

Well yeah, certainly the orange one would be something pretty rare to have, and there is no direct-diode available that produces 593 nm. On the blue front i don't selling the 473 was a mistake as direct, single mode, diodes of similar color are now available on the market, and probably a lot...

Could be a caching problem indeed. The letsencrypt certificates work well, but they have a pretty short lifetime (90 days afaik). Maybe you system held on to a previous one that was outdated and a good reload can do miracles there.

With things like laser beams you probably want to have the RAW files to work with. One issue is that JPG uses a higher resolution for brightness information than for color information (chroma subsampling). For most content that's not a big problem, but with laser beam shots you may want to...

It seems like these optics to a reasonable job of taming the multimodes, but it's very far from perfect - and it probably will be so whatever you do. I've tried prism pairs as well - which are a bit more compact in size - to tame multimode diodes, but the long-range beam results have never...

Removing the ads would be a decent incentive, though i must i admit i probably see very few of them since i've adblock plus enabled - not specifically for lpf, but it indicates it's blocking 3 ads on here, though i can see plenty of others (it blocks ads from big networks, not the pretty...

Having a chat function is great, but it's probably the -last- thing you want to make a paid feature out off: The problem with chat's is often a lack of participants, and putting in the donation requirement greatly reduces the number of potential users. Also, a chat may be a good place to go...

Well, you shouldn't even give kids the chance to put a laser directly up to their eyes. With a line generating optic in place it would not be dangerous at any realistic distance (say a foot away), but kids can be idiots. This would apply to things like high output flashlights too though, if...

Yeah, i have 113 points as well, doubt that would be some kind of coincidence right? I'ts a bit of a strange number to get stuck at (if it were 127 or 255 or something it would make sense), but then again i'm not sure how it's caclulated in the first place :D

Another thing i noticed: When i go to the new posts, and click on something in previously contributed to, it takes me to the last page of that topic. I think it used to take me to my last post so i could easily read on what what was contributed by others beyond my last post. I'm not sure if...

This looks a lot more like the 'good old LPF' to me :) I'm not sure which i prefer yet, but having both options would be great, the dark theme is especially nice when in a darker environment.