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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 12 — Apr. 20, 2006
  • pp: 2761–2765

Laser-mode selection by a combination of biprism-like reflectors with narrow amplitude masks

Yurij Parkhomenko, Boris Spektor, and Joseph Shamir  »View Author Affiliations


Applied Optics, Vol. 45, Issue 12, pp. 2761-2765 (2006)
http://dx.doi.org/10.1364/AO.45.002761


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Abstract

In recent work the laser mode selectivity induced separately by a biprism-like reflector and by an absorbing strip was investigated by numerical analysis. It was shown that each of these elements in an otherwise conventional resonator was suitable to cause the laser to oscillate preferentially on the first odd mode that contains a line singularity, which is a useful dark beam (i.e., a laser beam with a dark central region) for high-resolution metrological applications. We study the combined effect of these two mode-selecting elements and show that the unified analysis leads to much better performance than could be expected from a simple superposition of the performance with each element alone. The results indicate that the mode selectivity can be enhanced by at least a factor of 3 compared with that of laser resonators with biprism-like reflectors alone. Thus a laser equipped with such a combined element will oscillate on a pure first-order mode with high power efficiency. Moreover, calculations show that the resultant dark beam, focused for metrological applications, has a significantly improved shape compared with the dark beam obtained by external modulation of a fundamental Gaussian beam.

© 2006 Optical Society of America

OCIS Codes
(140.3300) Lasers and laser optics : Laser beam shaping
(140.3410) Lasers and laser optics : Laser resonators
(140.3430) Lasers and laser optics : Laser theory
(140.3570) Lasers and laser optics : Lasers, single-mode
(140.4780) Lasers and laser optics : Optical resonators

History
Original Manuscript: August 29, 2005
Revised Manuscript: November 11, 2005
Manuscript Accepted: November 20, 2005

Citation
Yurij Parkhomenko, Boris Spektor, and Joseph Shamir, "Laser-mode selection by a combination of biprism-like reflectors with narrow amplitude masks," Appl. Opt. 45, 2761-2765 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-12-2761

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