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Thread: first holograms made with a casio projector!

  1. #1
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    Default first holograms made with a casio projector!

    i thought you guys might like this..........

    Click image for larger version. 

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    With low demands on the diode itself, (mw instead of watts), this diode easily accepts positive feedback thru it's output window, then its jus a matter of allowing it to come to a thermal equilibrium at the same time. by adjusting the current while the laser is in an interferometer set-up to achieve the longest coherent possible, i then allow it to run a while to thermally adjust then check the coherent length and make an even smaller adjustment to the current again, and i repeat this cycle until im happy with the lasers fringe structure......
    i made two one beam holograms last night (w/8inches of coherent length),and only passive cooling!

  2. #2

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    Good work Dave. How much power did it give when it was finally stable?

  3. #3
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    Nice! Did you use the same type of lens you have on ebay?
    http://img62.imageshack.us/img62/3985/laser.gif

    Doc's website

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    thanks guys, yes Doc thatís the same uncoated lens im selling at E-bad.
    Bob to be truthful I havenít tested it yet! I was only concerned to tune in the fringes (so to say). Iíll do the final specs upon completion. I suspect @20 mw (after optics),@ 250mA

  5. #5
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    mixedgas is online now Creaky Old Award Winning Bastard Technologist
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    Any chance of this driving dichromate gelatin?

    Steve
    Qui habet Christos, habet Vitam!
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    When I still could have...

  6. #6
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    Should be no problem ! It just needs a good holographer at the controls !

  7. #7
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    as it turns out these diodes are great for DCG!

    here the proof! 22mw @45sec


  8. #8
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    Brilliant Dave. A great sense of satisfaction I would imagine.

    Jem
    Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.Ē... Douglas Adams 1952 - 2001

  9. #9

    Talking

    This is great news!!

    I am just coming back to holography... work on and off making holograms since 1973

    My schedule for the weekend is to finish building a few 445nm portable lasers and bench models (TECed), and now, clean up my holography table... and to catch up with holography in general.

    I read back un June that it may be possible to create holograms with 445nm in the single mode at low currents, got excited at the idea of using them.

    What kind of plates did you use?

  10. #10
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    Thumbs up

    That is so cool

    I was trying to build a hologram stuff machine myself some years ago..
    But it was to much to get into :P

    I love holograms and think they are cool "old-school" effects..
    Nice stuff you have made there :-)

    You dont have any video of HOW that stuff work when you scan a image?



    Cheers

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