Vol. 7, issue 11-12, article # 15Zemlyanov A.A., Kolosov V.V. Ivestigation into spontaneous emission amplification in an active refractive medium by the transfer equation method. // Atmospheric and oceanic optics. 1994. V. 7. No. 11-12. P. 837-840.
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The ray tracing technique based on the radiative transfer equation is used to describe the spontaneous emission amplification in an active medium. Using this approach, analytical solutions for the intensity distribution and coherence function in the exit plane of the active medium with parabolic profiles of dielectric constant and emission coefficient in the transverse cross section have been derived. Applicability of the approximation when contribution to output emission is made only by spontaneous sources adjacent to the far end of the active medium is analyzed. It is demonstrated that this approximation is inapplicable in many real situations, and it is necessary to take into account the sources in the whole active medium.