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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 17, Iss. 11 — Nov. 1, 2000
  • pp: 1828–1834

Observation of emission from chaotic lasing modes in deformed microspheres: displacement by the stable-orbit modes

Seongsik Chang, Richard K. Chang, A. Douglas Stone, and Jens U. Nöckel  »View Author Affiliations


JOSA B, Vol. 17, Issue 11, pp. 1828-1834 (2000)
http://dx.doi.org/10.1364/JOSAB.17.001828


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Abstract

By combining detailed imaging measurements at different tilt angles with simulations of ray emission from prolate-deformed lasing microdroplets, we conclude that the dominant contribution to the laser emission of such three-dimensional dielectric microcavities must come from modes associated with the chaotic region of the ray phase space. As a particularly striking signature, maximum emission from such chaotic lasing modes is not from tangent rays emerging from the highest curvature part of the rim. The laser emission is observed and calculated to be nontangent and displaced from the highest curvature regions owing to the presence of stable orbits. In this paper we present the first experimental evidence for this phenomenon of dynamical eclipsing.

© 2000 Optical Society of America

OCIS Codes
(140.1540) Lasers and laser optics : Chaos
(140.3410) Lasers and laser optics : Laser resonators
(230.3990) Optical devices : Micro-optical devices
(230.5750) Optical devices : Resonators
(260.2110) Physical optics : Electromagnetic optics
(290.4020) Scattering : Mie theory

Citation
Seongsik Chang, Richard K. Chang, A. Douglas Stone, and Jens U. Nöckel, "Observation of emission from chaotic lasing modes in deformed microspheres: displacement by the stable-orbit modes," J. Opt. Soc. Am. B 17, 1828-1834 (2000)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-17-11-1828


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References

  1. M. C. Gutzwiller, Chaos in Classical and Quantum Mechanics (Springer-Verlag, New York, 1990).
  2. J. U. Nöckel, A. D. Stone, and R. K. Chang, “Q spoiling and directionality in deformed ring cavities,” Opt. Lett. 19, 1693–1695 (1994).
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  8. Because the system of interest has a low refractive index, the polarization dependence of decay rates will be neglected in this work, allowing us to reduce Maxwell’s equation to the scalar wave equation.
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  16. The effect of gravity on the droplet trajectory is negligible owing to the relatively high speed of the droplets. The initial speed of the droplets emerging from the orifice of the droplet generator is 10 m/s, and the droplets used in the experiment are located ~1 cm below the orifice. For example, when the droplet generator shoots droplets horizontally, deviation between the true droplet trajectory and the one without gravity is only 0.028°.
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  19. Because the ray simulations do not include tunneling, they cannot account for the bright rims in the experimental images at θD=90°.

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