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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
    Clinically insane.

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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

  3. #3
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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
    Kyrie Eleison! I love the smell of Deep Fried Neon in the Morning.

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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
    Kyrie Eleison! I love the smell of Deep Fried Neon in the Morning.

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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.
    Clinically insane.

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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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    mixedgas's Avatar
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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
    Kyrie Eleison! I love the smell of Deep Fried Neon in the Morning.

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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

    Steve
    Kyrie Eleison! I love the smell of Deep Fried Neon in the Morning.

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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
    Kyrie Eleison! I love the smell of Deep Fried Neon in the Morning.

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    Quote Originally Posted by mixedgas View Post
    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
    Hi Steve,
    When I did this experiment I was just a punk kid with no budget and just enough knowledge to be dangerous.... actually not much has changed... I just have a better budget now and a lot more patience

    I really cant remember much of the details. In hind sight some of my diodes did taper off in power over a few months but it wan't anything catastrophic.


    I think the diode was a 3-5mw red but can't remember the wavelength. It cost around $60US in 97.

    I dug out that book, Here is the info used.
    cover.jpgPage 350.jpgISBN.jpg

    Kit

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    i would *really* like to see this done on one of the new 445 diodes...

    Quote Originally Posted by kitatit View Post
    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
    suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.

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