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Huadong Shifan Daxue xuebao. Ziran kexue ban

Stimulated Electric Quadrupole Raman Scattring between Opposite-Parity States of Atomic Potassium

In L

Published Jan 1, 1981• 0 citations
OpenAlex

Abstract

Stimulated Electric Quandrupole-Dipole Raman Scattering between 4s→4p of atomic potassium has been observed.The tuning range of pump laser in which tunable stokes emission was observed is more wider than that reported by Cotter and Yuratich in 1979.

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Stimulated and enhanced two-photon emissions from excited states in potassium have been observed. This emission is primed by stimulated electronic Raman radiation generated by scattering of a giant pulse ruby radiation. Four-photon parametric processes also take place. The two processes can be distinguished by tuning the laser frequency. Most of the emitted radiations are plane-polarized. A pumping model is proposed explaining the required population inversions and the polarization properties of the radiations.
An enhanced two-photon emission has been observed between the 6S and the 4S levels of potassium. The priming field is the stimulated electronic Raman emission at 2720 cm-1due to scattering of ruby laser radiation from the4P_{3/2}state in potassium. The intense emission at the complementary frequency ω2is close to the 5P → 4S resonance lines. As a result, the coupling coefficient has a resonance character that is favorable for the enhancement. The observed results are compared with a simple analysis. The relation of the enhanced emission with two-quantum absorption, stimulated Raman effect, and parametric four-photon processes is discussed.