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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Vibrationally induced transparency in optically dense resonance medium

Yevgeny V. Radeonychev, Mikhail D. Tokman, Alexander G. Litvak, Olga A. Kocharovskaya

Published May 30, 2002• 0 citations
Publisher

Abstract

A novel method of resonant absorption suppression of monochromatic radiation via supersonic mechanical vibration of medium sample along radiation propagation is proposed. Steady-state field propagation without resonant absorption and appearance of spectral components is predicted.
DOI
10.1117/12.468936

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Generation of coherent multifrequency optical radiation by means of excitation of mechanical vibration (acoustical oscillation) of a medium along the propagation of resonant laser radiation is proposed. At the same time the vibrating medium becomes transparent for the incident resonant radiation (acoustically induced transparency). We show, that generation of multifrequency radiation takes place in the absence of inversion in two-level quantum system for any energy distribution among the spectral components of the incident (multifrequency in general) field and any amplitude of vibration. Amplitude of vibration determines efficiency of the normal wave generation. Mechanism of the effect is destructive interference of different spectral harmonics of the field components appearing in the frame of vibrating atoms.
Abstract We establish a close physical analogy between coherent forward scattering of γ -ray radiation in the vibrating quasi-resonant nuclear absorber and the XUV field propagation in the quasi-resonant atomic medium in the presence of the moderately strong IR field. We prove that both processes, under certain conditions, are described by similar Maxwell–Bloch equations for a two-level medium with modulated parameters of the resonant transition. It results in similar transformation of both γ -ray and XUV fields at the exit from the medium, fully determined by the characteristics of applied modulation and spectral content of the incident fields. We find an appropriate analytical solution describing transformation of the electromagnetic field as a result of its propagation in the modulated medium. We show, in particular, that recently observed effects of (i) suppressed resonant absorption in coherent γ -ray scattering of vibrating absorber and (ii) ionization rate modulation in IR pump–XUV probe experiments, present themselves as different manifestations of the same general physical phenomenon of modulation induced transparency (MIT). That transparency is induced by modulating the parameters of the resonant transition. While only partial MIT was observed so far, we suggest certain conditions for conducting some realistic experiments, which should demonstrate nearly 100% transparency in both processes.