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Journal of Experimental and Theoretical Physics

Nonlinear narrow density resonances of excited molecules in a standing light wave

Vladilen S Letokhov, B. D. Pavlik

Published Sep 1, 1973• 0 citations
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The possibility of the resonant variation in the total number of particles on the excitation level with the transmission of the field prequency through the center of a Doppler-widened absorption line is examined. The article examines the effect of the formation of the resonance of the total number of particles in the simplest mode of the moving two-layer particles with a varied degree of saturation of absorption, and also the effect of rotational relaxation on the value of the resonance in the case of molecular transitions.
Abstract The optical nonlinearity associated with the giant two‐photon absorption, GTA, of excitonic molecules in CuCl is discussed. The metamorphoses of the four‐wave mixing spectra due to the generation of the exciton grating are demonstrated by the observation of their polarization characteristics. The propagation characteristics of the excitation around the GTA resonance are observed by micro‐Raman spectroscopy. The two‐photon Raman scattering light is used as a probe to monitor the spatial character of the excitation. The propagation characteristics show a drastic change in the very narrow spectral range around the GTA resonance energy.