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Proceedings Paper

Optimum design of the phase control system of coherent beam combining of fiber amplifiers
Author(s): Xiaomeng Zhao; Xiaojun Xu; Pu Zhou; Jing Hou; Jinbao Chen
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Paper Abstract

Combining fiber laser beams are of current interest for scaling lasers to high average output power. The Master Oscillator Power Amplifier (MOPA) configuration is important in fiber laser beam combination. The efficiency of coherent beam combining is depended on the phase control precision of the system mostly, which is equivalent to the closed loop output phase noise. In this paper, a simplified negative feedback model of the phase control system is constructed to study the optimum design of the system. The effects of the transfer function of the system on the phase noise of the optical fiber amplifier, the measured noise and the stability of the system are analyzed. The relationship between the closed loop output noise and the system parameters is analyzed and calculated. The results show that there is a set of system parameters to minimize the closed loop output noise for different phase noise of the optical fiber amplifier, and for a fixed set of system parameters, the closed loop output noise of the system almost changes linearly with the change of the input noise. The effective means to achieve optimal system parameters for higher degree of control precision are obtained.

Paper Details

Date Published: 6 February 2008
PDF: 8 pages
Proc. SPIE 6823, High-Power Lasers and Applications IV, 68231A (6 February 2008); doi: 10.1117/12.757193
Show Author Affiliations
Xiaomeng Zhao, National Univ. of Defense Technology (China)
Xiaojun Xu, National Univ. of Defense Technology (China)
Pu Zhou, National Univ. of Defense Technology (China)
Jing Hou, National Univ. of Defense Technology (China)
Jinbao Chen, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 6823:
High-Power Lasers and Applications IV
Dianyuan Fan; Robert F. Walter, Editor(s)

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