Abstract
We have demonstrated a high-gain preamplifier for Nd:glass-based chirped-pulse amplification systems using optical parametric chirped-pulse amplification (OPCPA) in periodically poled potassium titanyl phosphate (PPKTP) in a collinear quasi-phase-matched configuration. The absence of birefringent walk-off enables high conversion efficiency and high beam quality using <1 mJ of pump energy. PPKTP has a potential to replace traditional angularly sensitive beta-barium borate preamplifiers for nearly degenerate OPCPA at wavelengths near 1 μm.
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