| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Internal phase control of fiber laser array based on photodetector array |
| Kai-Kai Jin(靳凯凯)1, Jin-Hu Long(龙金虎)1, Hong-Xiang Chang(常洪祥)1, Rong-Tao Su(粟荣涛)1,2,3,†, Jia-Yi Zhang(张嘉怡)1, Si-Yu Chen(陈思雨)1, Yan-Xing Ma(马阎星)1,2,3, and Pu Zhou(周朴)1 |
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China;
2 Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China;
3 Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China |
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Abstract Coherent beam combining (CBC) of fiber laser array is a promising technique to realize high output power while maintaining near diffraction-limited beam quality. To implement CBC, an appropriate phase control feedback structure should be established to realize phase-locking. In this paper, an innovative internal active phase control CBC fiber laser array based on photodetector array is proposed. The dynamic phase noises of the laser amplifiers are compensated before being emitted into free space. And the static phase difference compensation of emitting laser array is realized by interference measurement based on photodetector array. The principle of the technique is illustrated and corresponding simulations are carried out, and a CBC system with four laser channels is built to verify the technique. When the phase controllers are turned on, the phase deviation of the laser array is less than $\lambda /20$, and $\sim 95$% fringe contrast of the irradiation distribution is obtained. The technique proposed in this paper could provide a reference for the system design of a massive high-power CBC system.
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Received: 14 March 2024
Revised: 05 April 2024
Accepted manuscript online: 06 May 2024
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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42.25.Kb
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(Coherence)
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42.55.Wd
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(Fiber lasers)
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52.38.-r
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(Laser-plasma interactions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62275272) and the Training Program for Excellent Young Innovators of Changsha (Grant No. KQ2305025). |
Corresponding Authors:
Rong-Tao Su
E-mail: surongtao@126.com
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Cite this article:
Kai-Kai Jin(靳凯凯), Jin-Hu Long(龙金虎), Hong-Xiang Chang(常洪祥), Rong-Tao Su(粟荣涛), Jia-Yi Zhang(张嘉怡), Si-Yu Chen(陈思雨), Yan-Xing Ma(马阎星), and Pu Zhou(周朴) Internal phase control of fiber laser array based on photodetector array 2024 Chin. Phys. B 33 074201
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