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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 15, Iss. 8 — Aug. 1, 1998
  • pp: 2138–2145

Coherence temporal evolution in Gaussian cavities of different lengths

M. R. Perrone, C. Panzera, and D. Diso  »View Author Affiliations

JOSA A, Vol. 15, Issue 8, pp. 2138-2145 (1998)

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The temporal evolution of the beam-quality factor M2 is investigated in plane-parallel cavities of different Fresnel numbers with a Gaussian reflectivity mirror and applied to a Xe–Cl excimer laser. The Fresnel number is changed by varying resonator length. Laser radiation of higher spatial coherence is provided by the cavity of greater length (2.5 m) and then of lower Fresnel number after the first transit. Indeed, the beam spatial coherence decreases with cavity length. It is also shown that the Gaussian mirror affects the properties of the oscillating laser radiation only at the very first cavity round trips. The near- and far-field spatial characteristics of the laser radiation do not vary after a few transits inside the cavity. Experimental results are supported by a theory formerly developed for the evolution of the parameters of Gaussian Schell-model beams propagating in Gaussian cavities.

© 1998 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(140.2180) Lasers and laser optics : Excimer lasers
(230.4040) Optical devices : Mirrors

Original Manuscript: November 3, 1997
Revised Manuscript: February 17, 1998
Manuscript Accepted: March 30, 1998
Published: August 1, 1998

M. R. Perrone, C. Panzera, and D. Diso, "Coherence temporal evolution in Gaussian cavities of different lengths," J. Opt. Soc. Am. A 15, 2138-2145 (1998)

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