Self-oscillation mode of laser radiation with resonant phase nonlinearity

  • Elena V. Timoshchenko Mogilev State A. Kuleshov University, 1 Kasmanawtaw Street, Magiliow 212022, Belarus
  • Vladimir A. Yurevich Belarusian State University of Food and Chemical Technologies, 3 Shmidta Аvenue, Magiliow 212027, Belarus

Abstract

The paper presents a resonance model of generation of a semiconductor laser emitting at wavelengths in the IR-range, which takes into account the nonlinear phase transformation of the resonant material response of the medium and the field of stimulated emission. The scheme for modelling the generation is based on a modification of the Maxwell – Bloch equations for materials with quantum-size effects. Under the condition of a relatively high concentration of quantum dots represented by dipole particles, a combination of nonlinear effects causing the dynamics of the phase relationship of the field and resonant polarisation is typical for these media. These include the mutual influence of near fields of dipole particles, resonant nonlinear refraction, and the optical Stark effect. The results of numerical calculation and qualitative analysis of the model showed that a special instability of the radiation is caused by the optical Stark effect, which maintains an effective level of amplitude-phase coupling in the laser scheme. It is shown that it is the factor of the nonlinear Stark shift of the resonant gain line that is capable of destabilising stable states of the laser system. In conjunction with other mechanisms of phase nonlinearity, the Stark effect generates self-modulation dynamics in forced emission, stimula­ ting, among other things, a regime of self-sustaining intensity pulsations that is interesting from a practical point of view.

Author Biographies

Elena V. Timoshchenko, Mogilev State A. Kuleshov University, 1 Kasmanawtaw Street, Magiliow 212022, Belarus

PhD (physics and mathematics), docent; head of the department of physics and computer technology, faculty of mathematics and natural sciences

Vladimir A. Yurevich, Belarusian State University of Food and Chemical Technologies, 3 Shmidta Аvenue, Magiliow 212027, Belarus

doctor of science (physics and mathema­ tics), full professor; professor at the department of technosphere safety and general physics, mechanical faculty

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Published
2024-10-04
Keywords: laser radiation, semiconductor quantum-dimensional structures, intensity self-pulsations, optical Stark effect
How to Cite
Timoshchenko, E. V., & Yurevich, V. A. (2024). Self-oscillation mode of laser radiation with resonant phase nonlinearity. Journal of the Belarusian State University. Physics, 3, 41-49. Retrieved from https://journals.bsu.by/index.php/physics/article/view/6507
Issue
No 3 (2024): Journal of the Belarusian State University. Physics
Section
Laser Physics

Copyright (c) 2024 Journal of the Belarusian State University. Physics

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