Interference phenomena in Doppler broadened quantum transitions: amplification of intense radiation without population inversion

Тип публикации: статья из журнала

Год издания: 1998

Идентификатор DOI: 10.1134/1.558450

Аннотация: We study the effect of nonlinear interference processes on quantum transitions in intense resonant electromagnetic fields with allowance for changes in level populations, relaxation processes, incoherent excitation, and Doppler broadening of the transitions, on the absorption, amplification, and refraction of the interacting fields. The theory is generalized to the case of nonlinear interference interaction of two intense fields in open and closed three-level quantum systems. Using the density matrix, we derive general expressions in the case of stationary interaction that make it possible to analyze the optical characteristics for various configurations of the interfering transitions by a simple substitution of parameters. The possibility of amplifying light without saturated population inversion in a resonant transition is discussed. We formulate the conditions for such amplification and use examples to show that under appropriate changes in the initial level populations and the intensity of the auxiliary light, the inversionless amplification coefficient does not decrease with increasing intensity of the amplified radiation. We also show that allowance for these accompanying processes greatly affects the choice of optimal conditions for interference in optical transitions. As an illustration we list the results of a numerical analysis of possible experiments. (C) 1998 American Institute of Physics.

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Издание

Журнал: Journal of Experimental and Theoretical Physics

Выпуск журнала: Vol. 86, Is. 2

Номера страниц: 244-258

ISSN журнала: 10637761

Место издания: Woodbury

Издатель: Amer Inst Physics

Авторы

  • Popov A.K. (Krasnoyarsk State Univ, Inst Phys, Krasnoyarsk 660036, Russia)
  • Kuchin V.M. (Krasnoyarsk State Univ, Inst Phys, Krasnoyarsk 660036, Russia)
  • Myslivets S.A. (Krasnoyarsk State Univ, Inst Phys, Krasnoyarsk 660036, Russia)

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