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Is the laser perfect monochromatic light source?

  1. May 10, 2013 #1
    Is the laser perfect monochromatic light source?
  2. jcsd
  3. May 10, 2013 #2


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    Staff: Mentor

    Nothing is perfect, but lasers are the best approximation we have - their line width can be below 1 Hz for visible light.

    A perfect monochromatic light source could not be switched on/off ;).
  4. May 11, 2013 #3

    Andy Resnick

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    Typical commercial lasers have linewidths ranging from kHz-GHz (He-Ne and Nd:YAG) up to a nm (laser diodes). In the lab setting, laser linewidths can go as low as 1Hz, but AFAIK that's approaching a fundamental limit.
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