Abstract
A theoretical analysis of single-mode emission of an injection laser is carried out in the framework of the nonlinear gain method. Nonlinear gain is regarded as the result of interaction of a strong (laser) field with weak fields having symmetrically detuned frequencies (superluminescent emission). The interaction is via beats in the inversion at the difference frequencies and correspondingly via a dynamic phase grating of the complex dielectric constant of the active region. Expressions are obtained for the spectral profile of the optical radiation in a single-mode laser with solitary diode cavity, and also in a laser with external cavity. An expression is obtained for the intensity-fluctuation spectrum in a single-mode laser with external cavity. It is shown that in such a laser the superluminescent modes adjacent to a laser mode are split into two components, each due to such an interaction.
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