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Thread: Japanese researchers test fire a 2 quadrillion watt laser

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    Japanese researchers test fire a 2 quadrillion watt laser

    Now aiming to increase the 100m long LFEX device output to 10 quadrillion watts.
    Read more.

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    The most important (but missing in this article) numbers, direct from the first line of the paper abstract: "2 kJ in a 1.5 ps pulse"

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    Re: continuous use question.

    I have no real background in this stuff but am just curious - what do they use for lenses and would this not limit continuous use anyway? Even if only a tiny fraction of the transmitted energy were absorbed, surely it wouldn't have to run for long before any lenses or mirrors involved melted and ceased to function properly.

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    It's like a camera lens though isn't it? I mean the lens etc. are fine as the laser is NOT focused on it
    Old puter - still good enuff till I save some pennies!

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    The hint for what it's probably for is in the name, "Laser for Fast Ignition Experiments" likely something to do with either, laser initiated Fusion, or as an overscale system for prototyping a replacement for sparkplugs. Both options are things I'm aware are being worked on in Japan, so there's every chance this is to do with one of 'em.

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    Similar to the USA national ignition facility.

    I think it's more interesting for scientists investigating very very high-temperature/pressure, e.g. processes in nuclear explosions (both bombs and stars).

    Practical civilian use seems much more far off. There was some crazy idea that this could be used to generate power through nuclear fusion, though I've no idea how they'd extract power and quickly repeat the pulse/blast. #deathstar ?

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    "No Mr Bond, I expect you to die"

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    Phased plasma rifle in the 40 watt range?
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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    "Laser Beam".




    The video isn't the scene I quoted, but it was the closest I could find.

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    So, can they finally take out Godzilla and Mothra, or have they just managed to find a way to tweak them off even more than they already are?

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    sirhobbes3
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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    So my question is, how close are we to having blaster rifles that are at least as accurate as Stormtroopers?

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    Re: Japanese researchers test fire a 2 quadrillion watt laser

    Quote Originally Posted by 3dcandy View Post
    It's like a camera lens though isn't it? I mean the lens etc. are fine as the laser is NOT focused on it
    No. Even if your lens is 99.9% transmissive (which it won't be), it will absorbs 0.1% of light passing through it. If you're blasting 2kJ of light through it, that's 2J of energy absorbed by your lens, which is not going to be healthy.

    This is why high power optics almost never use lenses, but instead rely only on mirrors. A mirror generally absorbs fractionally less light than an equivalent lens, but the big advantage is the mirror has a back side you can actively cool.

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