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We present the results of performance modeling of a diode-pumped solid-state HiLASE laser designed for use in inertial fusion energy power plants. The main amplifier concept is based on a He-gas-cooled multi-slab architecture similar to that employed in Mercury laser system. Our modeling quantifies the reduction of thermally induced phase aberrations and average depolarization in 
${\mathrm{Yb}}^{{3+}}$:YAG slabs by a combination of helium cryogenic cooling and properly designed (doping/width) cladding materials.
