Conical refraction of a high-M2 laser beam

G. S. Sokolovskii; V. Yu. Mylnikov; S. N. Losev; K. A. Fedorova; E. U. Rafailov

doi:10.1117/12.2252461

20 February 2017 Conical refraction of a high-M² laser beam

G. S. Sokolovskii, V. Yu. Mylnikov, S. N. Losev, K. A. Fedorova, E. U. Rafailov

Proceedings Volume 10090, Laser Resonators, Microresonators, and Beam Control XIX; 100901R (2017) https://doi.org/10.1117/12.2252461
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

We report on experiments with conical refraction of laser beams possessing a high beam propagation parameter M². With beam propagation parameter values M²=3 and M²=5, unusual Lloyd’s distributions with correspondingly three and five dark rings were observed. In order to explain this phenomenon, we extend the dual-cone model of the conical refraction that describes it as a product of interference of two cones that converge and diverge behind the exit facet of the crystal. In the extended model, these converging/diverging cones are represented as the cone-shaped quasi-Gaussian beams possessing the M² parameter of an original beam. In this formalism, a beam-waist of these cone-shaped beams is proportional to the M² value and defines the area of their interference which is a width of the Lloyd’s ring. Therefore, the number of dark rings in the Lloyd distribution is defined by the M² value and can be much greater than unity. The results of the numerical simulations within the extended dual-cone model are in excellent agreement with the experiment.

Citation Download Citation

G. S. Sokolovskii, V. Yu. Mylnikov, S. N. Losev, K. A. Fedorova, and E. U. Rafailov "Conical refraction of a high-M² laser beam", Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100901R (20 February 2017); https://doi.org/10.1117/12.2252461

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