We demonstrate a successful recompression of 4.5 mJ, 30 fs femtosecond pulses from a Ti:Sapphire oscillator amplified in a ring multipass optical parametric chirped pulse amplifier using beta-barium borate crystal pumped by a commercial frequency doubled Nd:YAG laser. Pulses with duration close to the Fourier transform limit were obtained. (c) 2006 Optical Society of America.
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