N. E. Molevich, A. A. Krents, E. A. Yarunova, “Transverse structures of the optical field: generation and control in broad-area lasers. Part 1. Lasers with a homogeneous line broadening”, Kvantovaya Elektronika, 2025, Volume 55, Number 4,Pages <nobr>204

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On the 45th Anniversary of the Samara Branch of the Lebedev Physical Institute of the Russian Academy of Sciences

Transverse structures of the optical field: generation and control in broad-area lasers. Part 1. Lasers with a homogeneous line broadening

N. E. Molevich^ab, A. A. Krents^ab, E. A. Yarunova^ab

^a Samara Branch of P. N. Lebedev Physical Institute, Russian Academy of Sciences
^b Samara National Research University

Abstract: We report a theoretical study of the spatiotemporal dynamics of wide-aperture lasers with a homogeneous line broadening using the Maxwell–Bloch model. Three dynamic classes of lasers (A, B, and C) are considered, for which a linear stability analysis of homogeneous steady-state generation is performed. It is shown that in class A and B lasers, the development of wave instabilities leads to the formation of complex transverse optical structures, whereas class C lasers are characterized by a homogeneous Hopf instability, accompanied by spatially homogeneous intensity oscillations. The secondary instabilities arising in class C lasers are studied using the Floquet method, and the parameters at which nonlinear optical structures, including spiral wave domains, are formed are determined. Numerical simulations confirm theoretical predictions and demonstrate the feasibility of suppressing secondary instabilities using external optical injection.

Keywords: wide-aperture lasers, Maxwell–Bloch model, wave instabilities, optical patterns, secondary instabilities, optical injection.

Received: 16.05.2025
Revised: 09.07.2025
Accepted: 11.07.2025