Raman frequency mixing under coherent population trapping conditions

Journal Article · Fri Jul 31 00:00:00 EDT 1998 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE1998V028N07ABEH001291· OSTI ID:21439440

Arkhipkin, V G; Popov, A K ^[1]; Manushkin, D V ^[2]; Myslivets, S A ^[3]

---

1. L.V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Academgorodok, Krasnoyarsk (Russian Federation)
2. Krasnoyarsk State Technical University, Krasnoyarsk (Russian Federation)
3. Krasnoyarsk State University, Krasnoyarsk (Russian Federation)

An investigation is reported of resonant four-wave frequency mixing of the type {omega}{sub 4}={omega}{sub 1}-{omega}{sub 2}+{omega}{sub 3} under coherent population trapping conditions. Such mixing may appear when radiations of frequencies {omega}{sub 1,2} are strong and when {omega}{sub 1}-{omega}{sub 2}={omega}{sub 20} ({omega}{sub 20} is the frequency of a dipole-forbidden transition). The density matrix method is used to calculate (taking quantum interference into account) the absorption coefficients, the refractive indices, and the nonlinear susceptibilities exactly for the strong fields and in the first order of perturbation theory for the weak fields. A study is made of the dependence of the power of nonlinear optical generation on various characteristics of the transitions and of the radiation, subject to the propagation effects. The cases of homogeneous and Doppler broadening of the resonant transitions are considered. The characteristics of transitions in the barium atom are used in numerical illustrations. It is shown that the efficiency of resonant nonlinear-optical conversion of radiation can be enhanced by utilising interference processes in quantum transitions, which represent coherent population trapping. (nonlinear optical phenomena)

• OSTI ID: 21439440
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 28, Issue 7; Other Information: DOI: 10.1070/QE1998v028n07ABEH001291; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
BARIUM
DENSITY MATRIX
DIPOLES
DOPPLER BROADENING
EFFICIENCY
FORBIDDEN TRANSITIONS
FREQUENCY MIXING
INTERFERENCE
NONLINEAR PROBLEMS
PERTURBATION THEORY
RAMAN EFFECT
REFRACTIVE INDEX
ALKALINE EARTH METALS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
LINE BROADENING
MATRICES
METALS
MULTIPOLES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SORPTION