Abstract
In this presentation, we report an improvement technique in our 700TW Ti:sapphire laser facility. In order to improve the contrast ratio, we designed a long cavity ring preamplifier. With careful alignment in each dimension of grating, we got a good focal spot after compressor. The size of focal spot was about 25μm with an f/10 off-axis-parabolic mirror (OAP). Using an f/3 OAP to focus the laser beam in experiment, we expect the laser intensity of 1021W/cm2 could be realized on the target.
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