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.
© 2011 Chinese Optics Letters
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