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Homework Help: The semiconductor laser

  1. Oct 25, 2008 #1
    i am not able to understand this line..

    in semiconductor laser the transition probablity for a radiative transition across the conduction and valence gap must be high and must exceed the probablity for non -radiative transfer of energy to the lattice.

    please explain this theory.
  2. jcsd
  3. Oct 25, 2008 #2

    Dr Transport

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    In other words, you won't have a laser if the electron transfers its energy to the lattice.
  4. Jan 20, 2010 #3
    it is so because, all the photons are not used in emitting light..the probabilty of radiative photons should be more so that we can get enough radiations in form of laser.actually some of the photons are absorbed in the material for the recombination of electron hole pairs.thus they do not emit radiations.
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