XXVII International Symposium "Nanophysics and Nanoelectronics", Nizhny Novgorod, 13 - 16 March 2023

Structure and self-modulation features of the superradiant states in asymmetric Fabry-Perot cavity

E. R. Kocharovskaya^a, Vl. V. Kocharovskii<sup>ab

a</sup> Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia
^b National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia

Abstract: The dependence of the structure and stability of strongly asymmetric stationary states of a superradiant laser with a slightly asymmetric low-Q Fabry–Perot cavity on its length, reflection factors of mirrors, and pumping level is studied. The states are related to a self-consistent inhomogeneous half-wavelength population inversion grating. The possibility of the existence of two dynamic phase transitions from a stationary (monochromatic) state of this type to a nonstationary one is established: 1) a dissipative superradiant transition to a regime with a quasi-continuous lasing spectrum (in a weakly asymmetric cavity) and 2) a self-modulation transition to a regime with a discrete lasing spectrum. It is shown that the latter can be caused by excitation of both polariton and electromagnetic laser modes due to resonant Rabi oscillations of active centers with a sufficiently long phase relaxation time.

Keywords: superradiant phase transition, population inversion grating, polariton modes, electromagnetic modes, self-modulation, discrete spectrum, continuous spectrum, low-Q cavity, Rabi oscillations.

Received: 05.05.2023
Revised: 29.06.2023
Accepted: 06.07.2023

DOI: 10.21883/FTP.2023.05.56202.29k

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