Regimes of Generation in Low-Q Distributed-Feedback Lasers with Strong Inhomogeneous Broadening of the Active Medium


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Abstract

We study the influence of the ratio between the relaxation rates of the field in a cavity and the polarization of active centers on the dynamic properties of the distributed-feedback lasers by means of 1D numerical simulation. The model of a two-level active medium with strong inhomogeneous broadening of the spectral line under CW wide-band pumping that provides two- or several-mode lasing in the vicinity of the Bragg photonic band gap is used. Evolution of the dynamic spectra and oscillograms of the laser emission with decreasing Q-factor of the Bragg resonator is analyzed. It is shown, in particular, that under conditions of the dominant role of the superradiant effects, there are unique opportunities for control of both quantitative and qualitative characteristics of lasing, including the spectral width, duration, and coherence length of various pulse components of the output radiation.

About the authors

E. R. Kocharovskaya

Institute of Applied Physics of the Russian Academy of Sciences

Author for correspondence.
Email: katya@appl.sci-nnov.ru
Russian Federation, Nozhny Novgorod

N. S. Ginzburg

Institute of Applied Physics of the Russian Academy of Sciences

Email: katya@appl.sci-nnov.ru
Russian Federation, Nozhny Novgorod

A. S. Sergeev

Institute of Applied Physics of the Russian Academy of Sciences

Email: katya@appl.sci-nnov.ru
Russian Federation, Nozhny Novgorod

V. V. Kocharovsky

Institute of Applied Physics of the Russian Academy of Sciences

Email: katya@appl.sci-nnov.ru
Russian Federation, Nozhny Novgorod

Vl. V. Kocharovsky

Institute of Applied Physics of the Russian Academy of Sciences

Email: katya@appl.sci-nnov.ru
Russian Federation, Nozhny Novgorod

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