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Proceedings Paper

Strong self-focusing of laser beam in a medium with quadratic nonlinear response
Author(s): Vyacheslav A. Trofimov; Tatiana M. Lysak
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Paper Abstract

We compare self-focusing of laser beam with Gaussian, super-Gaussian and ring profile in a medium with quadratic nonlinear response due to cascading SHG. The duration of the light pulse under consideration is about microsecond. Nevertheless, the dispersion of group velocity is also taken into account. We demonstrate a possibility of strong growth for intensity of the laser radiation without changing the pulse shape and Gaussian profile of the beam. For initial super- Gaussian and ring profile the Gaussian profile appears due to the diffraction of laser beam at certain section of nonlinear medium. Then, the optical radiation undergoes self-focusing without changing the Gaussian intensity distribution till appearance of the first nonlinear focus. This phenomenon has various practical applications. For example, it can be used for developing the laser system in microsecond range of pulse duration which operates in the regime similar to KLM regime for femtosecond laser system.

Paper Details

Date Published: 15 October 2012
PDF: 11 pages
Proc. SPIE 8497, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VI, 849705 (15 October 2012); doi: 10.1117/12.927454
Show Author Affiliations
Vyacheslav A. Trofimov, Lomonosov Moscow State Univ. (Russian Federation)
Tatiana M. Lysak, Lomonosov Moscow State Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 8497:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VI
Shizhuo Yin; Ruyan Guo, Editor(s)

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