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High-resolution studies of collision-induced population grating resonances in optical four-wave mixing in sodium vapor

High-resolution studies of collision-induced population grating resonances in optical four-wave... Optical four-wave mixing resonances in sodium vapor induced by collisions with inert buffer gases (He, Ar, Xe, N 2 ) are characterized at high resolution (< 5 MHz) using lasers tuned near the D lines of Na. These resonances are interpreted in terms of coherent scattering from a population grating established by collisional absorption of the incident radiation. The roles of homogeneous and inhomogeneous contributions to the resonance line shapes are clarified. The line shapes exhibit structure sharper than the predicted linewidth, that characteristic of the 3 P -to- 3 S transition rate. We show that this is caused by collision-induced optical pumping which introduces the ground-state lifetime into the grating relaxation physics. These long-lived gratings are exemplified dramatically by experiments in the presence of N 2 which collisionally quenches the Na 3 P states. Similar results are obtained in Xe where it is argued that excimer formation with the 3 P states plays a role in the population dynamics. Model calculations of the effects of sodium level degeneracy on the grating dynamics are presented to support these conclusions. Finally we present data illustrating interference between the collision-induced population grating resonances detailed here and collision-induced coherent Raman resonances between Zeeman sublevels of the ground state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

High-resolution studies of collision-induced population grating resonances in optical four-wave mixing in sodium vapor

Physical Review A , Volume 30 (5) – Nov 1, 1984
12 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1984 The American Physical Society
ISSN
1094-1622
DOI
10.1103/PhysRevA.30.2327
Publisher site
See Article on Publisher Site

Abstract

Optical four-wave mixing resonances in sodium vapor induced by collisions with inert buffer gases (He, Ar, Xe, N 2 ) are characterized at high resolution (< 5 MHz) using lasers tuned near the D lines of Na. These resonances are interpreted in terms of coherent scattering from a population grating established by collisional absorption of the incident radiation. The roles of homogeneous and inhomogeneous contributions to the resonance line shapes are clarified. The line shapes exhibit structure sharper than the predicted linewidth, that characteristic of the 3 P -to- 3 S transition rate. We show that this is caused by collision-induced optical pumping which introduces the ground-state lifetime into the grating relaxation physics. These long-lived gratings are exemplified dramatically by experiments in the presence of N 2 which collisionally quenches the Na 3 P states. Similar results are obtained in Xe where it is argued that excimer formation with the 3 P states plays a role in the population dynamics. Model calculations of the effects of sodium level degeneracy on the grating dynamics are presented to support these conclusions. Finally we present data illustrating interference between the collision-induced population grating resonances detailed here and collision-induced coherent Raman resonances between Zeeman sublevels of the ground state.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Nov 1, 1984

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