lasers: help

Discussion in 'Physics & Math' started by souiss, Jan 23, 2004.

  1. souiss Registered Member

    Messages:
    2
    Hi everybody,

    how is it practically possible to change the wavelength of a laser?
    I have to choose between two lasers for a PLD (pulsed laser deposition) setup, but I'm a freshman in this field...
    there are two kind of laser for this application, apparently: KrF gas lasers (248nm) and Nd:YAG solid-state laser (1066nm). for the later, it seems possible to divide the wavelength by a factor of 4, i.e. 266nm. How can one do that?
    thanks in advance for our help and have a nice week-end

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    souiss
     
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  3. James R Just this guy, you know? Staff Member

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    You'd probably use some kind of non-linear medium for the wavelength division, I guess.

    What exactly is PLD?
     
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  5. souiss Registered Member

    Messages:
    2

    PLD stands for Pulsed Laser Deposition. One focuses a laser beam on a target. The target material evaporates, which creates a plume that deposited the material on a substrate.
     
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  7. NanoTec Registered Senior Member

    Messages:
    30
    Nd:YAG laser emissions can be frequency quadrupled using a (KDP) Potassium Dideuterium Phosphate crystal, (KTP) Potassium Titanium oxide Phosphate, or (BBO) Barium Borate.

    BBOs high cost provides increased moisture tolerance.
    Unfortunately reliability and heating issues limit 4th harmonic power output to ~2W.

    For third harmonic results see: here (promotes helium convective cooling)

    Do you believe increased absorption at higher frequency will overcome the conversion loss?
     

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