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Optics Letters

Optics Letters


  • Vol. 23, Iss. 5 — Mar. 1, 1998
  • pp: 313–315

Modal decomposition of partially coherent flat-topped beams produced by multimode lasers

Riccardo Borghi and Massimo Santarsiero  »View Author Affiliations

Optics Letters, Vol. 23, Issue 5, pp. 313-315 (1998)

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We present a simple mathematical model giving a possible description of a partially coherent light beam exhibiting a flat-topped transverse intensity profile. Such a model allows us to deduce the modal distribution inside a multimode stable optical cavity, assuming that the modes are of the Hermite–Gauss type. The analytical expression used to represent flat-topped profiles is of the flattened Gaussian type and leads to an exact, closed-form expression for the M2 factor of the output beam. An analogous procedure could be used to treat the general problem of deducing the modal distribution inside a laser cavity starting from intensity measurements of the output beam.

© 1998 Optical Society of America

OCIS Codes
(030.4070) Coherence and statistical optics : Modes
(140.3460) Lasers and laser optics : Lasers

Riccardo Borghi and Massimo Santarsiero, "Modal decomposition of partially coherent flat-topped beams produced by multimode lasers," Opt. Lett. 23, 313-315 (1998)

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