Chinese Optics Letters, 2011, 9 (4): 041408, Published Online: Mar. 30, 2011  

Coherent addition of gratings for chirped-pulse-amplified lasers based on near-field and far-field measurements Download: 776次

Author Affiliations
1 College of Optic-Electric Science and Engineering, National University of Defense Technology, Changsha 410073, China
2 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
Abstract
The development of phased-array grating compressor is a crucial issue for high-energy, ultra-short pulse petawatt-class lasers. Almost all systems have adopted a tiled-grating approach to meet the size requirements for the compression gratings. We present a computer-control test system utilizing near-field interference and far-field focusing capable of monitoring and fast correcting tiled errors of the grating compressor. In this system, the tilt/tip errors between the two gratings are determined by the Fourier transform (FT) of the individual interference fringe, and the piston errors are determined by the ratio of the two primary peaks formed in the far-field pattern as a function of the piston difference. Monochromatic grating phasing is achieved experimentally and pulse compression is demonstrated with a tiled grating system.

Yuchuan Yang, Hui Luo, Xiao Wang, Fuquan Li, Xiaojun Huang, Bin Feng, Feng Jing. Coherent addition of gratings for chirped-pulse-amplified lasers based on near-field and far-field measurements[J]. Chinese Optics Letters, 2011, 9(4): 041408.

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