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Technical Physics Letters

Evidence for nonstationary saturation of the absorption of a gas in a frequency-modulated standing wave

Valentin M. Gelikonov, Iu. I. Zaitsev, Grigorii B. Malykin

Published Dec 1, 1979• 0 citations
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Nonstationary processes in a three-level active paramagnetic phaser system have been investigated in case of the inversion state branching (bistability) which takes place below the threshold of self-excitation of the phonon generation. It has been shown that the nature of the branching of inversion states and transient processes in such a system depends significantly not only on a hypersound signal intensity, that was determined before, but also on a signal modulation frequency. Narrow nonlinear resonances and a critical slowing-down of transient processes have been found at simultaneous saturation of a spin-system by a standing electromagnetic pumping field and a hypersound-signal traveling wave.
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.