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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Four-wave parametric oscillation in Na vapor

Nobuhito Hayashi, Kenji Harada, Minoru Ogata, Kenji Mori, H. Yoshida, Masaharu Mitsunaga

Published Aug 1, 2007• 0 citations
Publisher

Abstract

A novel type of parametric oscillation has been observed in Na atomic vapor, where four Stokes/anti-Stokes-shifted waves, mutually coupled by electromagnetically induced diffraction, simultaneously burst into oscillation with high conversion efficiency under excitation by resonant counter-propagating pump beams with elliptic beam profiles.

DOI
10.1109/cleopr.2007.4391765

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A novel type of parametric oscillation has been observed in Na atomic vapor, where four Stokes/anti-Stokes-shifted waves, mutually coupled by electromagnetically induced diffraction, simultaneously burst into oscillation with high conversion efficiency under excitation by resonant counter-propagating pump beams with elliptic beam profiles.
We present theoretically and experimentally a novel type of parametric fluorescence and oscillation in which four optical waves in off-axis, diagonal directions simultaneously build up under resonant counterpropagating pump-laser excitation in atomic sodium vapor. Two of the four are anti-Stokes shifted and the other two are Stokes shifted, and they are strongly coupled owing to electromagnetically induced diffraction. Theoretically, the Liouville-Maxwell equations are solved to derive four-wave propagation equations. Experimentally, we have observed four-wave parametric oscillation when a weak off-axis seed beam is introduced into otherwise axially symmetric parametric fluorescence patterns. Temporal waveforms are also analyzed, and strong correlations between any pairs of the four emissions are identified.
An effort was made to optimize the coherent anti-Stokes scattering four-photon parametric oscillation process in thallium vapor in the 277 nm range. The dependence of the stimulated emission power on the thallium vapor pressure, confocal parameter, detuning from two-photon resonance, and pump power was investigated. The considerable saturation of the parametric oscillation power observed both with respect to the pump power and the vapor pressure was attributed to the breakdown of the wave interaction as a result of the strong high-frequency Kerr effect under two-photon resonance conditions.