We propose a thin-disk multi-pass amplifier based on a pair of conjugated parabolic mirrors. Pumped with 940nm laser diode and seeded with 1030nm ps regenerative amplifier, this novel amplifier scheme exhibits relatively high efficiency and insensitivity to the thermal lensing of the thin-disk caused by high pump power density. Parameters of the output beam have been measured. The beam quality of the seed laser was found to be deteriorated after propagating through the amplifier, with the M2 factor changed from 1.3 to 18.4. In order to acquire a further comprehension on the origins of the deterioration of beam quality, simulations and experiments were carried out.
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