激光原理与技术教学课件-扩充阅读04-Numerical analysis of laser mode competition and stability.pdfVIP

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激光原理与技术教学课件-扩充阅读04-Numerical analysis of laser mode competition and stability.pdf

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1 May 2000 Physics Letters A 269 2000 112–119 www.elsevier.nllocatephysleta Numerical analysis of laser mode competition and stability Alina Gearba , Gabriela Cone ‘Politehnica’ Uniersity of Bucharest, Department of Physics, 313 Splaiul Independentei, RO-77206 Bucharest, Romania Received 1 June 1999; received in revised form 13 March 2000; accepted 30 March 2000 Communicated by A.R. Bishop Abstract The competition between simultaneously oscillating modes in a laser oscillator is discussed. We analyze numerically the mode completion in a laser with two or three modes that are oscillating over their threshold, starting from the stability conditions in different situations of coupling between modes. For the two-mode oscillating case, our results represented in the intensity–time plane lead to the same conclusions as those from the published literature represented in the intensity–in- tensity plane. 2000 Elsevier Science B.V. All rights reserved. PACS: 42.60.Lh; 42.65.Pc Keywords: Laser mode competition; Stability 1. Introduction demonstrated that the atomic coherence established between two lower levels of a three-level atom using an external field may lead to laser action even the The phenomenon of mode coupling in a multi- active medium is not in an inverted state lasing mode laser has been extensively studied 1,2