The condition for coherent laser emission from forward-biased p-n junctions [1-3] can be written as [4] [equation 1]... order for the reported values [1-3] of Ic/A to agree with Eq. (1), must must use values pf d ~50 μ [4]. The question arises as to the nature of the mechanism which could confine the light generated near the junction to such small distances.
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Yariv et al. (1963) studied this question.
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