Abstract
The optical parametric chirped pulse amplification (OPCPA) technique is promising for constructing a 100-TW/90-fs laser system. This laser system consists of a diode-pumped Nd:phosphate oscillator, two LBO preamplifiers and a final power KDP amplifier. A noncollinear BBO-I optical parametric amplifier pumped by a Q-switched and frequency-doubled Nd:YAG laser has been demonstrated. The temporally-stretched chirped signal laser pulses with a bandwidth of 36nm(FWHM) are amplified without limitation in bandwidth and distortion in the spectrum. The gain bandwidth is very sensitive to the pump-signal angle. Variation of this angle of ∼1 5mrad can significantly reduce the amplified bandwidth and results in a significant distortion of the amplified spectrum.
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