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Optics Letters

Observations of predicted cooperative shifts in optically pumped stimulated emissions in Xe

W. R. Garrett, Mary Anne Moore, M. G. Payne, Vincent W. Barnett

Published Apr 15, 1994• 10 citations
Publisher

Abstract

In a recent study Garrett showed that stimulated emissions can be suppressed and shifted under the influence of a wave-mixing interference [Phys. Rev. Lett. 70, 4059 (1993)]. We observe the predicted pressure-dependent frequency shifts in optically pumped stimulated emissions from Xe.
DOI
10.1364/ol.19.000581

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When a principal atomic transition (dipole allowed from the ground state) is driven by odd- multi-photon excitation or by stimulated hyper-Raman scattering, a nonlinear multi-wave mixing field is generated at the transition frequency. A number of dramatic effects on such odd-photon mediated processes can ensue as a result of the internally generated wave-mixing fields. Excellent agreement between theory and experimental studies in Xe and in metal vapors is illustrated for a number of predicted effects including: suppression and strong shifting of resonance lines and hyper-Raman emissions under single and multi-laser excitation. We illustrate the dependence of the interference-related effects on pressure, oscillator strength, wavelength combination and relative propagation directions of pump laser beams. Contrary to most other nonlinear effects, we show that none of the features (in the semi-classical regime) depends on the intensity of the driving laser field.
Discriptions are given of recent theoretical and experimental results of dramatic effects, during the interval of the excitation pulse, in optically pumped stimulated emissions (OPSE). Forward-directed OPSE from a two-photon resonantly excited state to a lower state which is also coupled to the ground state is strongly suppressed and backward emissions are frequency shifted. Surprisingly, the effects are caused by an interference from a wave-mixing field. Several other implications of this effect are given and, on the basis of this phenomenon, several puzzling ASE observations mentioned in other published work are noted and clarified.