Abstract
High power laser facilities have been developed to achieve novel standards in light-matter interactions. The repetition rate is severely limited by the heating of the large size components, and in particular the large-aperture amplifiers. Cooling these optical components turns out to be a major challenge for increasing the repetition rate of high power laser beam lines. Here we report a practical implementation of a large aperture Nd:phosphate split-slab based amplifier using a liquid cooling system. The amplification of a 90 × 90 mm2 beam with a gain coefficient of 1.135 per pass and wave-front deformation lower than λ/3 per pass is achieved with a repetition rate of 1 shot per minute. The cooling system is sufficient to maintain the gain as well as the beam quality over a long time operation. Additionally, the pressure inside the amplifier can be controlled to minimize the optical deformation. This single liquid-cooled amplifier is a promising step towards future beam-lines able to deliver hundreds of shots per day with beam quality compatible with target focusing applications.
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