Research on high repetition rate and high efficiency optical parametric chirped pulse amplification: Quasi-phase matching crystals have a larger effective nonlinear coefficient in the optical parametric amplification process. Numerical analysis shows that it can provide 6.2×106 high gain saturation amplification in the optical parametric pre-amplification process, and the parametric conversion efficiency is greater than 25%. Based on the parametric gain characteristics of quasi-phase matching, an optimized design of a sub-TW high repetition rate OPCPA system pumped by a full diode laser is given.
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