Abstract:We demonstrate a two-stage three-pass non-collinear optical parametric chirped-pulse amplifier delivering 125 ñJ pulse energy at 20 kHz repetition rate, corresponding to an average power of 2.5 W. The system is pumped by a 20 kHz Nd:YVO 4 regenerative amplifier system. A grism-pair stretcher stretches the 6 fs seed pulses to more than 100 ps from 650 nm to 1000 nm. The amplified signal pulses are compressed with SF57 and fused silica glass blocks. Using an acousto-optical programmable dispersive filter to comp… Show more
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