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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 30, Iss. 7 — Apr. 1, 2005
  • pp: 738–740

Deciphering output coupling mechanisms in spiral microcavities with femtosecond light bullets

F. Courvoisier, V. Boutou, J. P. Wolf, R. K. Chang, and J. Zyss  »View Author Affiliations


Optics Letters, Vol. 30, Issue 7, pp. 738-740 (2005)
http://dx.doi.org/10.1364/OL.30.000738


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Abstract

A pump-probe two-photon-excited fluorescence technique deciphers in space and time the propagation of ballistic wave packets sustained by whispering-gallery modes (WGMs) in a spiral-shaped microcavity. Diffraction on the spiral discontinuity does not prevent the WGMs from closing. The resultant average Q of the resonator is 3×10^4 ± 50%. Experimental results are compared with numerical simulations, providing evidence of a new contribution to output coupling: Part of the WGM evanescent wave is reflected at the spiral notch and leads to a propagating wave at an angle that matches the previously observed laser emission direction in 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran-doped poly(methyl methacrylate) and InGaN spiral lasers.

© 2005 Optical Society of America

OCIS Codes
(060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(140.4780) Lasers and laser optics : Optical resonators
(170.6920) Medical optics and biotechnology : Time-resolved imaging
(320.2250) Ultrafast optics : Femtosecond phenomena

Citation
F. Courvoisier, V. Boutou, J. P. Wolf, R. K. Chang, and J. Zyss, "Deciphering output coupling mechanisms in spiral microcavities with femtosecond light bullets," Opt. Lett. 30, 738-740 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-7-738

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