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Proceedings Paper

Optimization of amplifying fiber length in rapidly Q-switched double-clad fiber lasers
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Paper Abstract

To obtain higher pulse energy and pulse peak power of Q-switched fiber lasers, the length of amplifying fiber should be optimized properly. In this paper, the optimum length of fiber for maximum pulse energy or maximum pulse peak power is investigated based on the rate equations of Q-switched fiber lasers. The relationship between the optimum fiber length and the output coupler reflectivity is got by using the mathematical technique of Lagrange multipliers and numerical analysis. As a result, output pulse energy and pulse peak power can be expressed as functions of the fiber length, multiplied by a few simple constants. The results show that, at given pump power level and round-trip parasitic loss, there is a demarcation of output coupler reflectivity which is inversely proportional to the round-trip parasitic loss coefficient. Fiber length should be optimized to achieve maximum pulse energy when the output coupler reflectivity is less than the demarcative reflectivity, and on the contrary, it should be optimized to yield maximum pulse peak power.

Paper Details

Date Published: 6 February 2008
PDF: 7 pages
Proc. SPIE 6823, High-Power Lasers and Applications IV, 682314 (6 February 2008); doi: 10.1117/12.756189
Show Author Affiliations
Lin Huang, Univ. of Electronic Science and Technology of China (China)
Yongzhi Liu, Univ. of Electronic Science and Technology of China (China)
Qianshu Zhang, Univ. of Electronic Science and Technology of China (China)
West China Normal Univ. (China)
Zhiyong Dai, Univ. of Electronic Science and Technology of China (China)


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

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