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Input light signal for laser

  1. Dec 8, 2012 #1
    hi , does input light signal for laser amplification has to be provided by the external source or it is created by lasing material itself?
  2. jcsd
  3. Dec 8, 2012 #2
    Every laser starts from the background signal given by spontaneous emission.
  4. Dec 8, 2012 #3


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    Science Advisor

    You can also seed one laser with a different laser as is typical for tunable lasers like Ti:Sapph.
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