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    Informatie gezocht

    Rough translation: @Dennis63 : Hello all, I have a question, I'm still quite unfamiliar with lasers or laser pointers, now I have a Gatling laser pointer acquired from an acquaintance (blue 21 cm) here. There were also 2 G-2 lenses with it. I was immediately very excited when I tried it, and so...
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    Looking for a lens to produce a circle pattern with a dot in the middle

    How perfect of a circle do you need? There are cat toys that come with star caps that do exactly that, but the circle is usually just a ring of small dots. You could adjust the size with a focusing lens.
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    LPM Options

    I've tried a DIY thing with a big heatsink, black chalkboard paint and a TEC0, connected to a multimeter, and then a lock-in amplifier, but it was too crude, and didn't give me any useable results... I have not tried this...
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    Detecting Potential Reflection Hazards

    A Raspberry Pi IR Camera *should* work, and they are quite inexpensive... but, without knowing the wavelength of the welder, no one can guarantee anything. I'm guessing it's around 1 µm, but guessing isn't going to protect your retinas!
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    Politics and General Debates Thread

    According to the US Constitution, a set of electors chooses the US President, so, like it or not, Biden is the legally and duly elected president. If you want to amend the Constitution so that the process is more fairly reflective of the people's votes, then that'd be the way to go. But don't...
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    Politics and General Debates Thread

    China is a mess. It's the largest country in the world, in terms of both population and international trade. It's also the country with the highest numeber of executions, and the only nations in the world where a financial crime can be punished by the government with the death penalty. So...
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    Informatie gezocht

    Sorry dat mijn Nederlands niet zo goed is. Ik was lui en dacht dat de regel tekst in het Engels de vertaling van je bericht was, dus daar reageerde ik op, wat niet juist was. Ik zie nu dat dat uw "ondertekeningsregel" is. Wat wil je met de laser doen? Als je hem bijvoorbeeld wilt gebruiken...
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    Informatie gezocht

    High powered blue lasers will always have rectangular beams. In fact, with any laser, if the power desired is higher than a small point source can handle without damage, the light source will have to be expanded, which opens up the laser cavity, making there be more output modes, which helps...
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    Politics and General Debates Thread

    I think we are conflating a lot of things here... Does anyone remember playing Clue or Cluedo? It's just a kid's game, but it comes with an important lesson that applies to real life in very serious situations. When you allege something, you are accusing someone of having done something...
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    LPM Options

    Budget?
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    Alien Life

    If an extraterrestrial being exists on the other side of the galaxy, and you never communicate with it, does it even matter? The Drake equation is kind of silly to me. For one, we don't know how many different ways life could exist. We are carbon/water based, but there are an unknown number...
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    Newbie Question

    Ok. Well, let's start simple. Say that the two beams are focused to a point (don't ever focus a point on your LPM, though) on the same spot. Say both lasers are identical wavelength and identical power, for convenience. Shine 1W from laser 1 and 1W from laser 2. What is the optical power...
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    Politics and General Debates Thread

    Republicans call Democrats "socialist," and, evidently, Democrats call Republicans "fascist." Meanwhile, there are people out there who hate the USA who are sitting back, watching all of this name-calling and mudslinging, eating their popcorn and smirking. The USA became a dumpsterfire not...
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    Blue laser vs green laser. Wich are better ?

    Maybe pedantic, but I disagree with the first statement. Depending on the light absorbed by the object, some things might burn easier with a green laser and others better with a blue laser. There's still no general way to answer the question, but if the ultimate goal is to burn, for example...
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    Floaters after partial laser eye damage, did they ever fade out with the time ?

    I've got pretty bad floaters myself. I'd never be able to afford any sort of fancy procedure to fix it. I don't think they have anything to do with lasers, but if they use lasers to correct them, there's probably a way that lasers could cause them. I'd be skeptical, though, that just casual...
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    Newbie Question

    Due to destructive interference, I would not expect the output to be 2 W. It'd probably be somewhere more than 1.414 W and less than 2 W
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    Testing Laser Safety Glasses

    The most certain way to test them, and this only works once, is to wear them whilst doing your experiments. If you permanently go blind, then you know 100% for sure that the glasses didn't work. There are lots of other much much safer ways to test, but no test is 100% accurate. I'd recommend...
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    Politics and General Debates Thread

    Interesting. I can't track down a copy of the waiver, but I'm curious as to what, exactly, it says. If it were my kid, I'd simply refuse to sign the waiver and then the school can think of their next move. It looks like the school in question faced so much backlash over this that they...
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    Politics and General Debates Thread

    Wow, I only had one kid still in school last year, and I didn't hear anything about that. Do you know which districts enacted that policy?
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    Politics and General Debates Thread

    Two completely different ways to look at that... either 1. Trump was wise enough to understand that the Taliban was going to route the Afghan government, so he needed to straighten everything out with them before they took over or 2. The Taliban's negotiations with Trump legitimized them to...




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