Frequency up-conversion by stimulated hyper-Raman scattering

Abstract

Stimulated electronic hyper-Raman scattering has been obtained in lithium vapor via excitation of several two-photon resonances ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2s-3d, 2s-4s, 2s-4d</tex> ) with a pulsed dye laser. The wavelength of the generated radiation was shorter than the pump wavelength and tunable over a few nanometers. The tuning behavior of the hyper-Raman laser was influenced by two-photon induced self-focusing/self-defocusing effects.