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Soviet Journal of Quantum Electronics

Natural fluctuations of radiation emitted from a traveling-wave laser in the direction opposite to the strong field

E F Slin'ko

Published Feb 28, 1982• 0 citations
Publisher

Abstract

A theoretical analysis is made of fluctuations of the radiation emitted from a single-mode traveling-wave laser with homogeneous broadening of the transition line in the direction opposite to the strong field. Allowance is made for the distributed nature of the laser parameters. An expression is derived for the spectral density of the field fluctuations. A comparison is made with the experiments.

DOI
10.1070/qe1982v012n02abeh005565

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A theoretical analysis is made of fluctuations of the radiation emitted from a single-mode traveling-wave laser with homogeneous broadening of the transition line in the direction opposite to the strong field. Allowance is made for the distributed nature of the laser parameters. An expression is derived for the spectral density of the field fluctuations. A comparison is made with the experiments.
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The linewidth of the beats between oppositely traveling waves in a ring gas laser due to shot fluctuations of the excitation of the active medium is calculated. It is shown that in saturating fields the contributions to the linewidth of the beats from quantum fluctuations of the emission and from shot fluctuations of the excitation are of the same order of magnitude and must be taken into account simultaneously. Shot fluctuations of the phases of the oppositely traveling wave due to fluctuations in the number of working atoms with a certain velocity are anticorrelated close to the center of the gain contour. This leads to additional line broadening of the beats between the oppositely traveling waves compared with the case of independent waves.
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