28 January 1999 Role of dressed states in resonant four-wave mixing with large Doppler broadening
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Proceedings Volume 3733, ICONO '98: Nonlinear Optical Phenomena and Coherent Optics in Information Technologies; (1999) https://doi.org/10.1117/12.340053
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation
Abstract
Experiments on resonant four-wave mixing demonstrated high- efficiency CW down-conversion of frequency in gas (up to 25%). Meanwhile, the high intensities make the perturbation theory invalid to understand the behavior of output power measured as a function of input powers. The nonlinear susceptibility of optically thin medium is found for difference-sum scheme (omega) 4 equals (omega) 1 - (omega) 2 + (omega) 3, where fields one and three are strong and two and four are weak. In symmetric case (kappa) 2 equals (kappa) 4, the integral over velocity can be calculated analytically for Doppler limits in collinear geometry. The compact explicit formula obtained yields the intensity and frequency dependence. The peak of mixing coefficient as a function of intensity is found around equal Rabi frequencies of fields one and three. The effect is shown to base on resonance between two closed cycles via sublevels of dressed states. The number of peaks in a spectrum varies from three to eight. Explicit formula allows interpreting the measurements and predicting the optimal relation between parameters for high conversion efficiency in gas with large Doppler broadening.
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S. A. Babin, S. A. Babin, E. V. Podivilov, E. V. Podivilov, D. A. Shapiro, D. A. Shapiro, "Role of dressed states in resonant four-wave mixing with large Doppler broadening", Proc. SPIE 3733, ICONO '98: Nonlinear Optical Phenomena and Coherent Optics in Information Technologies, (28 January 1999); doi: 10.1117/12.340053; https://doi.org/10.1117/12.340053
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