Experimental demonstration of using divergence cost-function in SPGD algorithm for coherent beam combining with tip/tilt control

CORC > 光电技术研究所 > 中国科学院光电技术研究所 > 自适应光学技术研究室（八室）

	Experimental demonstration of using divergence cost-function in SPGD algorithm for coherent beam combining with tip/tilt control
	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
	2013
卷号	21 期号:21 页码:25045-25055
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.
学科主题	Algorithms - Amplifiers (electronic) - Fiber amplifiers - Gradient methods - Locks (fasteners) - Optimization
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000326085600061
内容类型	期刊论文
源URL	[http://ir.ioe.ac.cn/handle/181551/6352]
专题	光电技术研究所_自适应光学技术研究室（八室）
作者单位	1.Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China 2.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
推荐引用方式 GB/T 7714	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.
APA	Geng, Chao,Luo, Wen,Tan, Yi,Liu, Hongmei,Mu, Jinbo,&Li, Xinyang.(2013).Experimental demonstration of using divergence cost-function in SPGD algorithm for coherent beam combining with tip/tilt control.Optics Express,21(21),25045-25055.
MLA	Geng, Chao,et al."Experimental demonstration of using divergence cost-function in SPGD algorithm for coherent beam combining with tip/tilt control".Optics Express 21.21(2013):25045-25055.