题名: Experimental demonstration of using divergence cost-function in SPGD algorithm for coherent beam combining with tip/tilt control
作者: Geng, Chao 1,2 ; Luo, Wen 1,2 ; Tan, Yi 1,2 ; Liu, Hongmei 1,2 ; Mu, Jinbo 1,2 ; Li, Xinyang 1,2
刊名: Optics Express
出版日期: 2013
卷号: 21, 期号: 21, 页码: 25045-25055 学科分类: Algorithms - Amplifiers (electronic) - Fiber amplifiers - Gradient methods - Locks (fasteners) - Optimization
DOI: 10.1364/OE.21.025045
文章类型: 期刊论文
中文摘要: A novel approach of tip/tilt control by using divergence cost function in stochastic parallel gradient descent (SPGD) algorithm for coherent beam combining (CBC) is proposed and demonstrated experimentally in a seven-channel 2-W fiber amplifier array with both phase-locking and tip/tilt control, for the first time to our best knowledge. Compared with the conventional power-in-the-bucket (PIB) cost function for SPGD optimization, the tip/tilt control using divergence cost function ensures wider correction range, automatic switching control of program, and freedom of camera's intensity-saturation. Homemade piezoelectric-ring phase-modulator (PZT PM) and adaptive fiber-optics collimator (AFOC) are developed to correct piston-and tip/tilt-type aberrations, respectively. The PIB cost function is employed for phase-locking via maximization of SPGD optimization, while the divergence cost function is used for tip/tilt control via minimization. An average of 432-?rad of divergence metrics in open loop has decreased to 89-?rad when tip/tilt control implemented. In CBC, the power in the full width at half maximum (FWHM) of the main lobe increases by 32 times, and the phase residual error is less than ?/15. ©2013 Optical Society of America. 英文摘要: A novel approach of tip/tilt control by using divergence cost function in stochastic parallel gradient descent (SPGD) algorithm for coherent beam combining (CBC) is proposed and demonstrated experimentally in a seven-channel 2-W fiber amplifier array with both phase-locking and tip/tilt control, for the first time to our best knowledge. Compared with the conventional power-in-the-bucket (PIB) cost function for SPGD optimization, the tip/tilt control using divergence cost function ensures wider correction range, automatic switching control of program, and freedom of camera's intensity-saturation. Homemade piezoelectric-ring phase-modulator (PZT PM) and adaptive fiber-optics collimator (AFOC) are developed to correct piston-and tip/tilt-type aberrations, respectively. The PIB cost function is employed for phase-locking via maximization of SPGD optimization, while the divergence cost function is used for tip/tilt control via minimization. An average of 432-?rad of divergence metrics in open loop has decreased to 89-?rad when tip/tilt control implemented. In CBC, the power in the full width at half maximum (FWHM) of the main lobe increases by 32 times, and the phase residual error is less than ?/15. ©2013 Optical Society of America. 收录类别: SCI
; Ei
项目资助者: National Natural Science Foundation of China [61205069, 61138007]
语种: 英语
WOS记录号: WOS:000326085600061
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内容类型: 期刊论文
URI标识: http://ir.ioe.ac.cn/handle/181551/6352
Appears in Collections: 自适应光学技术研究室（八室）_期刊论文
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作者单位: 1. Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China
Recommended Citation:
Geng, Chao,Luo, Wen,Tan, Yi,et al. Experimental demonstration of using divergence cost-function in SPGD algorithm for coherent beam combining with tip/tilt control[J]. Optics Express,2013,21(21):25045-25055.
