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Thread: Simple Homemade T.E.A. Laser

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    Default Simple Homemade T.E.A. Laser

    I found this project today, very very interesting...

    Has anyone tried this type of laser?

    http://www.sparkbangbuzz.com/tealaser/tealaser7.htm

    http://www.youtube.com/watch?v=iSTvi...layer_embedded
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    Hi Dnar,

    Wow that is fascinating. No I haven't tried that one but I do have a book caller the laser cookbook I bought in the pre internet days.

    It's a pretty low tec experiment but quiet interesting.

    Get a cheap laser diode and decouple the current limiting section of it's driver and dip the laser in liquid nitrogen.... The beam diverges greatly but boy does the power go up. By a factor of 50-300 times I think the book said. It was so long ago can't remember all the details but it worked and it didn't seem to do to much damage to the laser.

    Where I worked at the time, let me take home a liter in a thermos. It lasted a day in the fridge.

    I'm back in Perth from the 16th til the 19th we should catch up.
    It's not everyday you meet a PL member from Perth.

    Kit

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    Get a cheap laser diode and decouple the current limiting section of it's driver and dip the laser in liquid nitrogen.... The beam diverges greatly but boy does the power go up. By a factor of 50-300 times I think the book said. It was so long ago can't remember all the details but it worked and it didn't seem to do to much damage to the laser.
    -------------end quote--------------------------------
    I'm curious, how close to Iop(max) were you? When I tried it I popped more then one diode. It does not take that much cooling to damage the faucets on most red diodes.

    Steve
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    I've done the N2, it works very well. I'm looking at TEA co2 for a client right now.

    Nitrogen is easy, TEA CO2 is easier, but a order of magnitude harder to detect the beam.

    TEA N2 is all over youtube, not just the guy you cited.

    The master of publishing this type of thing is here:

    www.pulslaser.de

    Be aware that home made lasers rarely reach the power levels of their refined commercial cousins.

    Steve
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    'm back in Perth from the 16th til the 19th we should catch up.
    It's not everyday you meet a PL member from Perth.
    Hi Kit. Catch up? Sure. I will be in China Oct 10-24, then Sydney 28+. Are you back Sept or Oct? Catch up before then or after, no worries.
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    I have attempted several times to reproduce the TEA design, but sadly had no chance due to inductive losses

    I now have a sealed nitrogen TE laser cartridge with capacitors and triggered spark gap for trying, and have everything needed to power TEA designs, but there is always a lack of time...

    TEA CO2 is really interesting, does it output 10600nm as well? If so, it might be a good idea to fiddle with CO2 cartridges if my nitrogen laser is unfilled

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    Helium Nitrogen Co2, 1:1:3 ratio to 1:1:5 ratio in terms of percentage of tube pressure.
    Works at higher pressures, 300-500 Torr.

    Seems to need better electrode shaping then N2, to prevent arcs and hot spots, plus UV preionization using a needle array.

    And yes its broadband around 9-10.6u.

    Steve
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    Thanks Steve,

    the cartridge has shaped electrodes and corona preionizing electrodes, so it should work nicely

    do you have any idea if there are other TE-capable gases?

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    Quote Originally Posted by shrad View Post
    Thanks Steve,

    the cartridge has shaped electrodes and corona preionizing electrodes, so it should work nicely

    do you have any idea if there are other TE-capable gases?
    neon, green line and orange line,

    everything else is IR or metal vapor.

    see www.pulslaser.de

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    mixedgas;163369]neon, green line and orange line, possible oxygen yellow or violet, maybe some xenon lines.

    Oxygen II+ would probably rip the &hit out the electrodes.

    everything else is IR or metal vapor.

    see www.pulslaser.de

    If you want to read the patent on the N2 and Co2 pulsed carts, do a advanced search on the patent server for Ali Javan, co inventor on the HENE.

    Steve
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