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Optics Letters

Coherent stimulated Raman emission from a microcavity-excited optical resonator

J.-G. Xie, Thomas E. Ruekgauer, Jilin Gu, M. Young, Paul Nachman, Robert L. Armstrong

Published Jan 1, 1994• 2 citations
Publisher

Abstract

We report the observation of coherent emission from a planar Fabry-Perot resonator driven by a single, coherently emitting microcavity. The microcavity, either a liquid microdroplet or microcylinder, emits coherent stimulated Raman scattering when irradiated by an intense pump laser; the Raman light, in turn, couples to modes of the resonator. The spatiotemporal characteristics of resonator emission are strongly influenced by the microcavity source within; notably, a significant excess time delay in the emission of stimulated Raman scattering (i.e., compared with that of the microcavity in free space) accompanies the appearance of a sharp resonator spatial interference pattern. This and other noteworthy features are described, and a qualitative discussion of their significance is given.

DOI
10.1364/ol.19.000058

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We report the observation of coherent emission from a planar Fabry-Perot resonator driven by a single, coherently emitting microcavity. The microcavity, either a liquid microdroplet or microcylinder, emits coherent stimulated Raman scattering when irradiated by an intense pump laser; the Raman light, in turn, couples to modes of the resonator. The spatiotemporal characteristics of resonator emission are strongly influenced by the microcavity source within; notably, a significant excess time delay in the emission of stimulated Raman scattering (i.e., compared with that of the microcavity in free space) accompanies the appearance of a sharp resonator spatial interference pattern. This and other noteworthy features are described, and a qualitative discussion of their significance is given.
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A complete set of cavity modes in planar dielectric microcavities is presented which naturally includes guided modes. We show that most of these orthonormal fields can be derived from a coherent superposition of plane waves incoming on the stack from the air and from the substrate. Spontaneous emission of a dipole located inside the microcavity is analyzed, in terms of cavity modes. Derivation of the radiation pattern in the air and in the substrate is presented. The power emitted into the guided modes is also determined. Finally, a numerical analysis of the radiative properties of an erbium atom located in a Fabry-P\'erot multilayer dielectric microcavity is investigated. We show that a large amount of light is emitted into the guided modes of the structure, in spite of the Fabry-P\'erot resonance, which increases the spontaneous emission rate in a normal direction. \textcopyright{} 1996 The American Physical Society.
A variety of stimulated nonlinear optical processes are observed under relatively low intensity cw excitation in droplet spherical microcavities. These include stimulated Raman and Rayleigh-wing scattering as well as four-wave parametric oscillation. The low thresholds for these stimulated processes are accounted for by all waves being in resonance with high-QQQ droplet modes and by the existence of a significant cavity QED enhancement (> 100 times) in the nonlinear gain coefficients.
A theory of coherent interaction between a sequence of ultrashort laser pulses and planar, thin-film microcavities in the form of Fabry-Perot resonators containing resonating atoms has been developed. The dynamics of transmission of single laser pulses has been analyzed numerically. Analytic solutions of the problem of four-wave mixing of optical fields separated in time have been obtained in the small-area approximation. The dynamic efficiency of conversion of incident waves to the coherent response field (photon echo) generated in a microcavity can be higher than in the case of a bulk resonant structure. Specific features of photon echo generation in a microcavity for arbitrary “areas” of laser pump pulses are discussed.