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Physical Review A

Laser-Induced Quenching of Metastable Deuterium Atoms. Singly Stimulated Two-Photon Emission and Anti-Stokes Raman Scattering

P. Bräunlich, R. J. Hall, P. Lambropoulos

Published Mar 1, 1972• 30 citations
Publisher

Abstract

An experimental arrangement for the measurement of singly stimulated two-photon emission and anti-Stokes Raman scattering from metastable deuterium atoms is described. The atoms, produced by charge exchange between cesium vapor and 5-keV deuterons, are subjected to intense light pulses from a Nd-glass laser. The generated photons are detected at the exit slit of a vacuum-uv spectrometer. The results are compared with theoretical calculations by Zernik.

DOI
10.1103/physreva.5.1013

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An experimental arrangement for the measurement of singly stimulated two-photon emission and anti-Stokes Raman scattering from metastable deuterium atoms is described. The atoms, produced by charge exchange between cesium vapor and 5-keV deuterons, are subjected to intense light pulses from a Nd-glass laser. The generated photons are detected at the exit slit of a vacuum-uv spectrometer. The results are compared with theoretical calculations by Zernik.
The generation of 145.6-nm radiation by stimulated anti-Stokes Raman scattering in inverted atomic selenium was first reported by Ludewigt et al. 1 We have performed experimental studies of this process in similar excitation conditions, which allow us to compare some of the results in the two studies. The inverted population of the selenium (4p4)1S0 metastable state relative to the (4p4)3P0 state was prepared by photodissociation of COSe vapor using broadband 193-nm radiation from an ArF excimer laser. The pump beam at 205.1 nm was generated by the first-order Stokes shift in deuterium of narrowband (0.27-cm–1), 193-nm radiation from a separate, tunable ArF laser. The pump beam was tuned near the selenium (4p4)1S0–(4p35s)3P1 intermediate resonance to generate tunable, coherent radiation at 145.6 nm. We have studied the process in a variety of experimental conditions. Factors affecting the conversion efficiency and tunability include the initial COSe pressure, the intensities and relative timing of the photolyzing and pump beams, and the presence of buffer gases. The experimental results are compared with theoretical calculations based on a recently developed three-level model2 which incorporates Doppler broadening and arbitrary decay times.