Abstract
The irradiation uniformity of a spherical target in a direct-drive implosion is a key issue in the relization of an efficient implosion. The origins of the nonuniformity come from a beam-intensity distribution on the target and the power balance among the 12 beams at the GEKKO XII glass-laser system. Coherency control of the laser beam was investigated for partially-coherent-light (PCL) generation coupled with a random phase plate (RPP). The wide spectral bandwidth and the large beam divergence reduced the higher spatial components of the nonuniformity. Precise control of the coating thickness of the RPP with an error less than 1.5% also reduced the lower-order modes.
© 1995 Optical Society of America
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