Experimental evidence of selection and stabilization of spatial patterns in a CO2 laser by means of spatial perturbations

Year: 1998

Authors: Ciofini M., Labate A., Meucci R., Wang P.-Y.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy;
Laboratory of Optical Physics, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences,P.O. Box 603, 100080 Beijing, China

Abstract: We report on experimental evidence of selection and stabilization of unstable patterns by means of spatial perturbations. Thin metallic wires, with a diameter comparable to the laser wavelength, are inserted into a laser cavity to realize the selection and stabilization process. We studied the effects of small displacement of a single wire on the fundamental and annular patterns. The observed phenomena can be explained considering the diffractive effects of the wire inside the optical cavity. By using more wires instead of a single wire, square and hexagonal patterns are obtained. (C) 1998 Elsevier Science B.V. All rights reserved.

Journal/Review: OPTICS COMMUNICATIONS

Volume: 154 (5-6)      Pages from: 307  to: 312

More Information: Work partly supported by coordinated project `Nonlinear Dynamics in Optical Systems of the Italian National Council of Research and by the European Contract FMRXCT960010 Nonlinear Dynamics and Statistical Physics of Spatially Extended Systems. The authors wish to thank Professor F.T. Arecchi for helpful discussions.
KeyWords: Diffraction; Optical pattern; Spatial perturbation; Electromagnetic wave diffraction; Perturbation techniques, Laser cavity, Carbon dioxide lasers
DOI: 10.1016/S0030-4018(98)00333-2

Citations: 26
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