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Journal of the Optical Society of America B

Anomalous luminescence of dispersed media during stimulated emission into whispering-gallery modes

Vitaly V. Datsyuk, I. A. Izmaǐlov, V. A. Kochelap

Published Oct 1, 1993• 1 citation
Publisher

Abstract

The luminescence of dispersed media during light generation in spherical microresonators has been investigated theoretically. The effect that is predicted for the first time to our knowledge is a drastic increase of the dispersed-medium luminescence intensity in the case of an inverted population of the metastable-molecule energy levels.
DOI
10.1364/josab.10.001941

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Stimulated emission into optical whispering modes of a spherical sample of CaF2{\mathrm{F}}_{2}F2​: Sm++{\mathrm{Sm}}^{++}Sm++ has been observed. Light produced by the stimulated emission is radiated tangentially form each point on the surface of the sphere. The experimental results have been interpreted in terms of the electromagnetic analog of the Rayleigh theory of the whispering gallery.
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We theoretically show that achieving high Q-factors of small whispering gallery mode resonators, together with significant non-harmonism (non-equidistance) of its modes, allows for extensive analogy between properties of atoms and the resonator modes. The non-harmonism in very high-Q microresonators is caused by the material as well as geometrical dispersion. The established analogy leads to creating of a photonic media with properties similar to those of atomic media. For instance, effective two-level systems can be formed within the resonator. The levels of the systems, i.e. the resonator modes, can be coupled with microwave or optical fields. Strong confinement of the light in the resonator along with high Q-factors results in nonlinear processes at low light levels even with small nonlinearities typical of optically transparent materials.
The theory of spontaneous emission in dielectric media is extended to take proper account of dispersion and local field corrections. For the case of spontaneous emission in a plasma or radiative electron-hole recombination in a semiconductor, there are effectively no local field corrections. A shift of emission lines due to a dispersive host medium is predicted and interpreted. The corrections to spontaneous and stimulated emission due to dielectric interfaces in microcavity lasers are discussed.