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Dynamic gain and frequency comb formation in exceptional-point lasers.
Nat Commun
October 2024
Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, 90089, USA.
Exceptional points (EPs)-singularities in the parameter space of non-Hermitian systems where two nearby eigenmodes coalesce-feature unique properties with applications such as sensitivity enhancement and chiral emission. Existing realizations of EP lasers operate with static populations in the gain medium. By analyzing the full-wave Maxwell-Bloch equations, here we show that in a laser operating sufficiently close to an EP, the nonlinear gain will spontaneously induce a multi-spectral multi-modal instability above a pump threshold, which initiates an oscillating population inversion and generates a frequency comb.
View Article and Find Full Text PDFNonlinear parametric generation and optical vortex transfer in graphene ensemble under Landau quantization.
Sci Rep
September 2024
Department of Physics, Sharif University of Science and Technology, Tehran, Iran.
We explore the dynamics of nonlinear parametric generation and light beam propagation in a Landau-quantized graphene structure with three energy levels interacting with two laser pulses, utilizing the Maxwell-Bloch equations. By applying a laser field to one transition of the graphene sample while keeping the second beam initially absent, the distinctive preparation of the graphene sample, coupled with its weak interaction with laser radiation, results in the parametric generation of a new laser beam in a different transition. We investigate the influence of diverse system parameters on both the efficiency of the generated beam and the propagation dynamics of both beams.
View Article and Find Full Text PDFOn the nature of two-photon transitions for a collection of molecules in a Fabry-Perot cavity.
J Chem Phys
March 2024
Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA.
Article Synopsis
- The study examines how a cavity influences nonlinear two-photon transitions in molecular systems, focusing on factors like cavity quality, field enhancement, and dephasing.
- It reveals that the molecular response to intense light fields is a trade-off between enhanced multiphoton transitions due to the cavity and the restrictive selection rules for resonant frequencies.
- The simulations adopt a classical approach to the radiation field, drawing from previous research to suggest that findings are applicable across various external probing scenarios.
Various solitons induced by relative phase in the nonlinear Schrödinger Maxwell-Bloch system.
Chaos
January 2024
School of Physics and Astronomy, Shanghai Jiao Tong University, 200240 Shanghai, China.
We study the effect of relative phase on the characteristics of rogue waves and solitons described by rational solutions in the nonlinear Schrödinger Maxwell-Bloch system. We derived the rational rogue wave and soliton solutions with adjustable relative phase and present the parameter range of different types of rogue waves and solitons. Our findings show that the relative phase can alter the distribution of rational solitons and even change the type of rational solitons, leading to a rich array of rational soliton types by adjusting the relative phase.
View Article and Find Full Text PDFStabilizing nanolasers via polarization lifetime tuning.
Sci Rep
September 2021
Institute for Theoretical Physics, Technische Universiät Berlin, Hardenbergstr. 36, 10623, Berlin, Germany.
We investigate the emission dynamics of mutually coupled nanolasers and predict ways to optimize their stability, i.e., maximize their locking range.
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