Resonance scattering in nonequilibrium media

Oleg Kh Khasanov

An analysis is made of the propagation of a short coherent optical pulse in a three-level resonant medium with an essentially nonequidistant spectrum as a function of the degree of preexcitation of the medium. It is found that in addition to self-induced transparency and resonance scattering, stimulated Raman scattering (Stokes or anti-Stokes) should be observed under certain spatial phase-matching conditions. The area theorem is formulated for all radiation components. An analysis is made of the case of propagation of a resonant electromagnetic pulse of frequency ω in a system of three-level atoms having an equidistant spectrum. Under conditions of preexcitation of the medium at the frequency 2ω by longitudinal acoustic pulses, a scattered transverse acoustic wave at the frequency ω may be observed.

Jacqueline O. Berg, Charles A. Langhoff, G. Wilse Robinson

M.V. Kazarnovski, Alexander V. Stepanov

Nikolai G. Basov, V. S. Zuev, O Yu Nosach +1 more

It is found that a new type of stimulated light scattering by ultrasonic vibrations may occur in the course of optically induced exothermic reactions in thermodynamically nonequilibrium media. These vibrations are excited as a result of inhomogeneous heat release caused by an inhomogeneous optical intensity distribution. An analysis is made of the main characteristics of this type of scattering and estimates are made of the gain of the scattered light wave.

Oleg Kh Khasanov

Igor' M Bel'dyugin, Michail G. Galushkin, O. I. Rechkin

A theory is developed of stimulated scattering of nonmonochromatic radiation whose spectral width is much greater than the spontaneous scattering line width or the frequency shift of the Stokes wave. It is shown that scattering of nonmonochromatic incident radiation under coherent conditions may take place as efficiently as for monochromatic pump radiation. The results apply to various types of stimulated scattering, in particular, to stimulated thermal scattering and stimulated scattering in media which are in thermodynamic nonequilibrium.