Optics, Quantum Electronics

Application of two-dimensional dynamic gain grating for generation of coherent radiation from spatially extended active media

V. R. Baryshev, N. S. Ginzburg

Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, 603950, Russiany Novgorod

Abstract: Lasers with light-induced two-dimensional distributed feedback are investigated, in which a two-dimensional grating of the gain of the active medium, induced by several pump laser beams, is used to ensure the coupling of four partial wave flows propagating in mutually orthogonal directions. The starting conditions and nonlinear dynamics of lasers with a new kind of a two-dimensionally distributed feedback are analyzed within the semiclassical approximation. Self-similarity conditions are found, ensuring the scaling of the laser parameters under the conditions of maintenance of steady-state lasing regime upon an increase in the active region size, which is accompanied by an increase in the integrated output power. The effect of diffusion of nonequilibrium carriers on the lasing process and threshold conditions is analyzed.

Received: 11.10.2011

 English version: Technical Physics, 2012, 57:6, 807–813

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