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Journal of the Optical Society of America B

Stimulated electronic Raman scattering in barium vapor

R. D. Verma, Satish M. Jaywant, Zafar M. Iqbal

Published Mar 1, 1985• 3 citations
Publisher

Abstract

Tunable stimulated electronic Stokes emission is generated at 659 and 667 nm in barium vapor with a pulsed dye laser. The emission is tunable over 300 cm−1. The conversion efficiency is as high as 30%.
DOI
10.1364/josab.2.000403

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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.
A phosphate neodymium glass laser emitting picosecond pulses tunable in the 1.05–1.07 μ range was developed to study nonlinear optical processes in atomic barium vapor. Its temporal characteristics were investigated using a modified second harmonic beam method. Electron stimulated Raman scattering and four-photon parametric conversion in atomic barium vapor were used to obtain efficient conversion of the third harmonic of the picosecond phosphate laser (350–356 nm) to the Stokes (580–600 nm) and anti-Stokes (250–253 nm) waves. The highest conversion quantum efficiency for the Stokes wave was 15%. Electron stimulated Raman scattering in an (6 s 2 ) 1 S –(6 s 7 s ) 1 S –(6 s 6 p ) 1 P 0 system, having a strongly forbidden first transition, was recorded for the first time. In the same system, two-photon pumping generated four-photon parametric superradiance and it was found that the signal and idler waves had anomalously broad spectra (wider than 100 cm −1 ).