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Soviet Journal of Quantum Electronics

Conversion of KrCl and XeCl laser radiation to the visible spectral range by stimulated Raman scattering in lead vapor

Gennadii S Evtushenko, Sergey V. Mel'chenko, Aleksei N Panchenko, В. Ф. Тарасенко

Published Apr 30, 1990• 0 citations
Publisher

Abstract

Conversion of KrCl and XeCl laser radiation by stimulated Raman scattering was achieved in lead vapor. The KrCl laser radiation was converted into three lines in the visible region at λ = 406, 590, and 723 nm by transitions from both the ground and first excited levels of the lead atom. The conversion efficiency of XeCl laser radiation of low spatial coherence was found to be limited by the activation of a competing nonlinear process.

DOI
10.1070/qe1990v020n04abeh005935

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Soviet Journal of Quantum Electronics•Sep 30, 1982•0 citations
Conversion of KrCl and XeCl laser radiation by stimulated Raman scattering was achieved in lead vapor. The KrCl laser radiation was converted into three lines in the visible region at λ = 406, 590, and 723 nm by transitions from both the ground and first excited levels of the lead atom. The conversion efficiency of XeCl laser radiation of low spatial coherence was found to be limited by the activation of a competing nonlinear process.
An experimental investigation was made of stimulated Raman scattering (STRS) of excimer laser radiation in barium, thulium, and europium vapors. The energy of XeF* laser radiation ( λ = 351 nm) converted to the yellow range (585 nm) in barium vapor was 6 mJ and the conversion efficiency was ∼39%. The spectral composition of the converted radiation is governed by the STRS, by four-wave parametric processes, and also by lasing due to the natural barium transition. Selection of the pump frequencies is required to concentrate the converted radiation at a single frequency and to reduce its divergence. Stimulated Raman scattering of XeCl* laser radiation ( λ = 308 nm) was achieved in thulium vapor at λ = 422 nm. In europium vapor in quasiresonance with the 6 s 2 8 S 0 1/2 –5 d 2 10 P 0 11/2 forbidden transition, stimulated emission was obtained due to the natural 5 d 2 10 P 0 11/2 –6 s 6 p 10 P 11/2 and 5 d 2 10 P 0 11/2 –6 s 6 p 10 P 3/2 transitions.
Emission at wavelengths of 1.0615 and 1.074 μ from a self-mode-locked YAG:Nd3+ laser was observed at thresholds which were only 1.5 and 3.5 times higher than the threshold for the emission of radiation with λ = 1.064 μ. Efficient conversion (characterized by a quantum efficiency of ~ 15%) of the third harmonics of the radiations with λ = 1.064 and 1.0615 μ to the visible (590 nm) and ultraviolet (250 nm) ranges was achieved in atomic barium vapor. Electron stimulated Raman scattering due to a strongly forbidden transition in a system of Ba atoms was observed for the first time.
An experimental investigation was made of the interaction of ruby laser radiation with a vapor of thallium atoms. Several atomic lines in the infrared range were observed and investigated for the first time. These lines were due to multiphoton excitation of the thallium atoms. The dependences of the energies of the infrared emission lines on the intensity of the exciting laser radiation indicated that they appeared because of multiphoton ionization of the atoms. Nonresonant stimulated Raman scattering involving electronic transitions between the 6P1/2 and 6P3/2 levels in the thallium atom was observed and studied. The polarization of the infrared emission lines and of the Raman lines was investigated as a function of the polarization of the exciting laser radiation. The energy efficiency of infrared conversion was ~10−5 %.