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

Lin Huang D.D.S.; Yongzhi Liu; Qianshu Zhang; Zhiyong Dai

doi:10.1117/12.756189

6 February 2008 Optimization of amplifying fiber length in rapidly Q-switched double-clad fiber lasers

Lin Huang D.D.S., Yongzhi Liu, Qianshu Zhang, Zhiyong Dai

Proceedings Volume 6823, High-Power Lasers and Applications IV; 682314 (2008) https://doi.org/10.1117/12.756189
Event: Photonics Asia 2007, 2007, Beijing, China

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.

Citation Download Citation

Lin Huang D.D.S., Yongzhi Liu, Qianshu Zhang, and Zhiyong Dai "Optimization of amplifying fiber length in rapidly Q-switched double-clad fiber lasers", Proc. SPIE 6823, High-Power Lasers and Applications IV, 682314 (6 February 2008); https://doi.org/10.1117/12.756189

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KEYWORDS

Reflectivity

Output couplers

Fiber amplifiers

Fiber lasers

Q switched fiber lasers

Q switched lasers

Pulsed laser operation

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