Phase synchronization in a two-mode solid state laser: Periodic modulations with the second relaxation oscillation frequency of the laser output |
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Authors: | Tzu-Fang Hsu Kuan-Hsuan Jao Yao-Chen Hung |
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Institution: | 1. Department of Applied Physics, National Pingtung University of Education, Pingtung 900, Taiwan;2. Physics Teaching and Research Center, Feng Chia University, Taichung 40724, Taiwan |
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Abstract: | Phase synchronization (PS) in a periodically pump-modulated two-mode solid state laser is investigated. Although PS in the laser system has been demonstrated in response to a periodic modulation with the main relaxation oscillation (RO) frequency of the free-running laser, little is known about the case of modulation with minor RO frequencies. In this Letter, the empirical mode decomposition (EMD) method is utilized to decompose the laser time series into a set of orthogonal modes and to examine the intrinsic PS near the frequency of the second RO. The degree of PS is quantified by means of a histogram of phase differences and the analysis of Shannon entropy. |
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Keywords: | Phase synchronization Two-mode solid state laser Empirical mode decomposition |
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