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Title: Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers
Authors: Zhang, Jiawei
Tang, Ming
Shi, Jun
Fu, Songnian
Li, Lihua
Liu, Ying
Cheng, Xueping
Liu, Jian
Shum, Ping
Keywords: Fiber Laser
DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2015
Source: Zhang, J., Tang, M., Shi, J., Fu, S., Li, L., Liu, Y., . . . Shum, P. (2015). Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers. Proceedings of SPIE - Fiber Lasers XII: Technology, Systems, and Applications, 9344, 93442F-. doi:10.1117/12.2078558
Abstract: Although the Master Oscillator Power-Amplifier (MOPA) based fiber laser has received much attention for laser marking process due to its large tunabilty of pulse duration (from 10ns to 1ms), repetition rate (100Hz to 500kHz), high peak power and extraordinary heat dissipating capability, the output pulse deformation due to the saturation effect of fiber amplifier is detrimental for many applications. We proposed and demonstrated that, by utilizing Genetic algorithm (GA) based optimization technique, the input pulse profile from the master oscillator (current-driven laser diode) could be conveniently optimized to achieve targeted output pulse shape according to real parameters' constraints. In this work, an Yb-doped high power fiber amplifier is considered and a 200ns square shaped pulse profile is the optimization target. Since the input pulse with longer leading edge and shorter trailing edge can compensate the saturation effect, linear, quadratic and cubic polynomial functions are used to describe the input pulse with limited number of unknowns(<5). Coefficients of the polynomial functions are the optimization objects. With reasonable cost and hardware limitations, the cubic input pulse with 4 coefficients is found to be the best as the output amplified pulse can achieve excellent flatness within the square shape. Considering the bandwidth constraint of practical electronics, we examined high-frequency component cut-off effect of input pulses and found that the optimized cubic input pulses with 300MHz bandwidth is still quite acceptable to satisfy the requirement for the amplified output pulse and it is feasible to establish such a pulse generator in real applications.
DOI: 10.1117/12.2078558
Rights: © 2015 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in Proceedings of SPIE - Fiber Lasers XII: Technology, Systems, and Applications and is made available as an electronic reprint (preprint) with permission of Society of Photo-optical Instrumentation Engineers (SPIE). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Conference Papers


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