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It's real, there are countless videos of the event online, as this was a huge demonstration and a lot of people were filming with their smartphones. Just a couple: https://www.youtube.com/watch?v=OeMMKmC5OOo https://www.youtube.com/watch?v=SHcZRyEnCds...

The argument for using red would be mostly that it doesn't degrade night vision / adaptation that much compared to green or blue light. This effect is certainly real, but i doubt what role it plays in pointing out stars - i doubt you'd crank up power level to a point where the laser beam in...

Well, there is some footage of what it actually looks like from a pilots perspective: Egyptian Laser Protest From POV of Helicopter | RTM - RightThisMinute This footage is from the arab spring in egypt, with a huge mass of people pointing their laser pointers at army helicopters flying over at...

Good, now go find a nice direct diode pointer for your endeavors. In the current market it'd be looking for something direct diode, single mode, in the range of 520-510 nm with a power of 20-50 mW to replace your old green DPSS. These will appear more blue than green compared to what you...

That would depend on the pathogen obviously. A pathogen can do significant damage yet not kill you, think of something like polio. It will make you stronger in the sense that you'll have increased immunity if exposed again in the future, but also crippled. As for pathogens with 100% mortality...

Yes, lasers are used in spectroscopy for plastic recycling, basically telling one kind of plastic from another allowing you to sort shredded waste material. For example it could identify PET (soda bottle shreds) and sort that into a bin for recycling, PP (packaging material) into another etc...

These would probably not be considered against the rules of warfare. Sure they could blind you, but then again so can some shrapnel from a shell or anything like that if you happen to get it in your eye. Plus that the targets so far are unmanned UAVs, and probably ICBMs to some degree...

What are you trying to assert here? Class II (old system, roman numerals) requires a maximum of 1 mW, so no laser >1 mW visible can conform to that class, and the same applies to current system 'class 2'. (this is assuming the beams are fairly narrow) What colour are these lasers?

Which was my entire point: You can see an airplane in all cases where you could interrupt flight operations. They -must- make themselves visible using the strobes below 10.000 feet, and if they omit to do so and then get hit with a laser, that's partially the pilot's fault as well. Surely you...

I'm not sure that -everyone- that survived the plague did so due to a previous non-lethal infection, perhaps some people were naturally immune, or at least able to survive being infected (the latter would be inferred if the previous-infection hypothesis is true). But that's all a bit beside...

Those points are all valid, and the do pose a threat to individuals, though not to the existence of the human species. Evidence that we are still here, and in great abundance, more or less proofs that. Pathogens have wiped out a significant portion of the human population, with something like...

Let's be a bit realistic here about any danger to aircraft: As you're doing astronomy to begin with, you'll be looking at the sky to begin with, and probably not in overcast conditions either. Any (commercial) aircraft flying below 10.000 feet are required to have their strobe lights on...

Well, they may actually be right. It's not really the blue light that is to blame for it, but our current life expentancies that so far exceed the natural lifespan of humans (40-ish years). Of course we evolved with exposure to sunlight, and without sunglasses for that matter. So there would...

I'd totally agree on that: get a direct diode pointer if you are concerned about IR safety. Since they produce the light you see directly there is no possible IR to leak out, and for your purposes they will be fine. DPSS lasers are still superior in aspects like monochromaticity, coherence...

The degree of co-collimation of IR leaking and visible light is a bit difficult to gauge and varies between dpss lasers as well. Usually i would not expect the 808 nm pump light to be collimated with the green 532 nm output. This, however, has 2 consequences for powerful lasers: - at very...

This is indeed usually done with trimmers on the galvo driver boards, which can be a big pain to adjust too since they all influence each other to some degree, so you can be fidding with them for quite some time even if you know what they actually do. But there is a software side to it as...

Trivia lessor from me today: Coding functionality in javascript is about a thousand times more frustrating that doing it server side :D

I'd strongly disagree on that. Back in the early 90's it would be unthinkable to have blue wavelength laser diode with an output of several watts on a budget of $100, or $10.000 for that matter. Nowadays you get it for $50-$100, even installed in a module and capable of several watts of...

You could only tell with a meter instead, even if you have a laser of known and confirmed power in the same range, comparing them side by side can be difficult. A narrow beam with lower total power may look brighter than a wide one, and also have worse divergence. And there is also the case to...

Yeah, basically don't buy -any- DPSS laser that has a duty cycle (i.e. incapable of continuous operation). This means that something overheats over time and could cause damage which is bad enough. But it also means that the relative temperature of pump diode, laser and doubler crystal (combo)...