Ultra-Powerful Laser To Be Built In Romania

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Ultra-Powerful Laser To Be Built In Romania

Posted by timothy on Thursday September 20, 2012 @01:10AM from the no-mr-bond-I-expect-you-to-fry dept.

cripkd writes "The 3rd pillar from the ELI program was given the go ahead Tuesday: 'In Romania, Magurele, the ELI pillar will focus on laser-based nuclear physics. For this purpose, an intense gamma-ray source is foreseen by coupling a high-energy particle accelerator to a high-power laser.' Here are some specs and details about why this is not your regular key-chain laser."

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Now all they need... by GigG · 2012-09-20 01:24 · Score: 5, Funny

Now all they need is a really big shark.

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Is buying a Harley Davidson as your first motorcycle since you were 16 at age 49 a midlife crisis issue?
Re:What's the point... by K.+S.+Kyosuke · 2012-09-20 01:29 · Score: 5, Informative

What's the point if we can't put one of these on a fricken shark? I mean, seriously. Is that too much to ask?
Of course you can put one these on a shark. Unfortunately, you'd have to clone that Megalodon first, they're kind of rare these days.

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Ezekiel 23:20
What is it to "coherently add" laser beams? by impossiblefork · 2012-09-20 01:46 · Score: 4, Interesting

A week ago or so I wanted to build some sort of passive optical arrangement to combine two images additively. One can't do it with mirrors and if one tries to do it with lenses, or tries to use internal total reflection somehow it will turn out that one can never get the internally reflected ray and the ray the ray entering through the surface of the lens to coincide. In fact I ended up strongly suspecting that it couldn't be done.

But "coherently adding" beams sounds exactly like this. Does anyone know if it really is the same thing, or how it works?
1. Re:What is it to "coherently add" laser beams? by Anonymous Coward · 2012-09-20 03:05 · Score: 5, Informative
  
  Some beam combining is just lens squeezing a bunch of side by side lasers down into a smaller beam, where the beam shape doesn't matter as much as beam power.
  The easiest way to combine two beams right on top of each other is just for them to have orthogonal polarizations, and run them "backwards" through one of the various optics that can split polarizations. You then end up with an unpolarized beam. With a little more care, if you can make sure the phases of the two beams are the same, you can combine two orthogonal linear polarized beams and end up with a linear beam output at 45 degrees to the original polarization, which then allows you to repeat the combining process. You can also use diffraction gratings to combine several beams on to one output beam, without using polarization.
  Doing these methods in a coherent fashion requires careful control of the relative phase of each laser, and starts acting more like phased arrays from radio/microwave bands. Things also get messy, as you can easily get into situations where ray optics no longer work and need to work with quasioptics.