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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:45 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
A control method of the LFF chaotic behavior in an ECSL system
Authors:
I.R. Andrei(1), M. Bulinski(2), Catalin M. Ticos(3)
Affiliation:
(1) The National Institute for Lasers, Plasma and Radiation Physics, Lasers Department, P.O. Box MG36, RO 76900, Bucharest, Romania
(2) University of Bucharest, Faculty of Physics 76900 Bucharest-Măgurele, P.O. Box MG-11
(3) Los Alamos National Laboratory, Plasma Physics Division P-24, Los Alamos, NM 87545, USA
E-mail
andreirelu@yahoo.co.uk
Keywords:
chaos, LFF, ECSL, nonlinear optics
Abstract:
The chaotic behavior of on external-cavity semiconductor laser (ECSL) working in a regime of low-frequency fluctuations (LFFs) can be controlled by periodic electro-optical phase modulation of light. We show by numerical simulation that for specific modulator/laser parameters the phase of the laser LFFs, which increases after each power drop-out event, can be synchronized with the phase of the modulator in a so called m:n phase synchronization.
The degree of stabilization is determined by calculating Shanon`s entropy and by analizing the stability of these synchronized states. The synchronization region in the variables of the modulator, frequency and amplitude, is mapped and also the zones of periodicity, low and high amplitude chaos are identified.
There are also underlined some aspects regarding the methods of controlling the chaotic behavior, especially a new confirmation of m:n type phase synchronization emergent in a time delayed feedback control scheme, with numerical applications in laser physics and with potential counterpart in economical behavior.
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