Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers
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...
| Main Authors: | , , , , , , , , |
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| Format: | Conference Paper |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/88735 http://hdl.handle.net/10220/46961 |
| _version_ | 1811693882387202048 |
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| author | Zhang, Jiawei Tang, Ming Shi, Jun Fu, Songnian Li, Lihua Liu, Ying Cheng, Xueping Liu, Jian Shum, Ping |
| author2 | Shaw, L. Brandon |
| author_facet | Shaw, L. Brandon Zhang, Jiawei Tang, Ming Shi, Jun Fu, Songnian Li, Lihua Liu, Ying Cheng, Xueping Liu, Jian Shum, Ping |
| author_sort | Zhang, Jiawei |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T06:58:44Z |
| format | Conference Paper |
| id | ntu-10356/88735 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:58:44Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/887352020-03-07T13:24:45Z Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers Zhang, Jiawei Tang, Ming Shi, Jun Fu, Songnian Li, Lihua Liu, Ying Cheng, Xueping Liu, Jian Shum, Ping Shaw, L. Brandon School of Electrical and Electronic Engineering Proceedings of SPIE - Fiber Lasers XII: Technology, Systems, and Applications Fiber Laser MOPA DRNTU::Engineering::Electrical and electronic engineering 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. Published version 2018-12-13T08:49:35Z 2019-12-06T17:09:52Z 2018-12-13T08:49:35Z 2019-12-06T17:09:52Z 2015 Conference Paper 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 https://hdl.handle.net/10356/88735 http://hdl.handle.net/10220/46961 10.1117/12.2078558 en © 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: [http://dx.doi.org/10.1117/12.2078558]. 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. 10 p. application/pdf |
| spellingShingle | Fiber Laser MOPA DRNTU::Engineering::Electrical and electronic engineering Zhang, Jiawei Tang, Ming Shi, Jun Fu, Songnian Li, Lihua Liu, Ying Cheng, Xueping Liu, Jian Shum, Ping Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers |
| title | Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers |
| title_full | Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers |
| title_fullStr | Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers |
| title_full_unstemmed | Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers |
| title_short | Genetic algorithm based optimization of pulse profile for MOPA based high power fiber lasers |
| title_sort | genetic algorithm based optimization of pulse profile for mopa based high power fiber lasers |
| topic | Fiber Laser MOPA DRNTU::Engineering::Electrical and electronic engineering |
| url | https://hdl.handle.net/10356/88735 http://hdl.handle.net/10220/46961 |
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