Wavelength doubling laser?

  1. I've heard of frequency doubling but is wavelength doubling a thing? If so, how efficient?
     
  2. jcsd
  3. UltrafastPED

    UltrafastPED 1,918
    Science Advisor
    Gold Member

    Frequency doubling divides the wavelength in half: http://www.rp-photonics.com/frequency_doubling.html

    The inverse process also works, and is usually called parametric down conversion:
    http://en.wikipedia.org/wiki/Spontaneous_parametric_down-conversion

    Your green laser pointer is an example of frequency doubling/second harmonic generation:
    http://en.wikipedia.org/wiki/Laser_pointer#Green
    See the schematic diagram on the right hand side - enlarge, and follow the red beam into the crystal which generates the green beam.
     
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