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Optics Communications

Gain saturation in optically pumped standing-wave gas lasers

Ferran Laguarta, Ramon A. Vilaseca, R. Corbalán

Published Apr 1, 1985• 4 citations
Publisher
DOI
10.1016/0030-4018(85)90272-x

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The structure of the Lamb dip may permit a standing-wave gas laser containing a saturable absorber (LSA) to exhibit frequency tristability while oscillating in a single spatial mode. This is concluded from the steady-state and stability analyses of a plane-wave gas-laser model in which the atomic populations are taken as homogeneous. Conditions for this behavior are investigated, and it is concluded that very high pump excitations are needed, which is in contrast to previously reported predictions of frequency multistability for LSA’s containing homogeneously broadened media.
An exact expression of the gain constant of two-level molecules (or atoms) in a standing-wave optical field is obtained for a special case where the optical frequency is in exact resonance with the molecular transition and the longitudinal and transverse relaxations have equal decay constants. Secondly, an exact form of gain constant as a function of frequency detuning which decribes the shape of Lamb dip or saturated absorption is shown for another case where the transverse relaxation is much faster than the longitudinal relaxation. A flat velocity distribution of molecules at Doppler limit is assumed in either case.