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Journal of Physics C Solid State Physics

Spin flip Raman scattering of harmonically generated 5.3μm radiation

Robert L. Allwood, Richard B. Dennis, R. Mellish, Stanley Desmond Smith, Brian S. Wherrett, R A Wood

Published Jun 14, 1971• 12 citations
Publisher

Abstract

The authors report the observation of stimulated Stokes scattering of 5.3 mu m pump radiation by spin flip excitations in InSb, using a 10.6 mu m CO 2 laser, together with a tellurium frequency doubler, as the 5.3 mu m source. The effects of resonant enhancement on the 5.3 mu m scattering are discussed and comparison made with 10.6 mu m results. The observation of atmospheric water vapour absorption lines near 5.5 mu m demonstrates the application of the spin flip source to high resolution spectroscopy.

DOI
10.1088/0022-3719/4/8/006

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The authors report the observation of stimulated Stokes scattering of 5.3 mu m pump radiation by spin flip excitations in InSb, using a 10.6 mu m CO 2 laser, together with a tellurium frequency doubler, as the 5.3 mu m source. The effects of resonant enhancement on the 5.3 mu m scattering are discussed and comparison made with 10.6 mu m results. The observation of atmospheric water vapour absorption lines near 5.5 mu m demonstrates the application of the spin flip source to high resolution spectroscopy.
A saturation model of stimulated Raman scattering, of general applicability, is put forward. The model is developed with reference to spin-flip electronic Raman scattering in InSb, where the number of excitations available for Raman scattering may be small by comparison with the incident photon numbers. A rate equation technique is used to evaluate the steady-state Stokes intensity and output powers for a Gaussian pump beam. The model is extended to take account of pump depletion and the relative importance of depletion, and saturation in limiting the conversion efficiency under different conditions is brought out. By comparison with continuous wave spin-flip measurements, values are obtained for the spin-relaxation time (τs) associated with spin reversal in InSb. For 1016free carriers per cubic centimeter at 36 kG,\tau_{s} \sim 12ns and for 1015cm-3at 16.9 kG,\tau_{s} \sim 1.3ns.
The main properties of infrared stimulated electronic Raman scattering (SERS) at the 6 2 S 1/2 -7 2 S 1/2, 3/2 transitions in cesium atoms are studied theoretically and experimentally as functions of the atomic concentration, which was varied from 10 11 to 10 16 cm −3 . It is found that the efficiency of generation of Stokes radiation strongly depends on one-photon absorption of the pump radiation tuned near frequencies of the 6 2 S 1/2 -7 2 P 1/2, 3/2 transitions. By using the equation for the density matrix, which describes the evolution of a three-level system, the theory of resonance excitation of IR radiation upon one-photon absorption at an adjacent transition is developed. The theory describes well the main features of IR SERS in alkali-metal vapors.