Laser diode principals

  1. As far as I understand, when forward biased voltage applied, electrons from N diffuse to P, then recombine. Since energy gap between conductive electron and hole is const => only certain wavelength photons is emitted.

    In gaseous lasers for example you need to gain a populational inversion, which requires to have a certain energy levels, including one of them to be metastable.

    How the stimulated emission works for laser diodes?
     
  2. jcsd
  3. UltrafastPED

    UltrafastPED 1,918
    Science Advisor
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  4. Cthugha

    Cthugha 1,714
    Science Advisor

    By the way, the formal name for the semiconductor equivalent of population inversion which is discussed in the PDF linked by UltrafastPED is the Bernard-Duraffourg condition. If you need more details, that is the term to look for.
     
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