Practical aspects of lasing without inversion in various media

  • Khurgin J
  • Rosencher E
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A rigorous density-matrix-based theory of lasing based on
optically induced or autoionization-induced coherence between the levels
is developed. The balance equations are obtained, and the conditions for
lasing threshold are derived as a function of pumping strength and
relaxation rates. Connection between the lasing without inversion and
Raman and parametric processes is established. The main conclusion is
that true CW lasing without inversion can indeed be obtained but only in
a system where pumping and relaxation rates are favorable for attaining
conventional lasing with population inversion. Practical implications of
it, especially for the intersubband lasers, are discussed

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  • Jacob B. Khurgin

  • Emmanuel Rosencher

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