Abstract

The optical parametric chirped pulse amplication (OPCPA) concept has been extended to the infrared range, providing a new approach, to our knowledge, to high-power femtosecond pulses in the $1.5\mu \mathrm{m}$ range. This amplifier is based on $1.05\mu \mathrm{m}$ pumping of bulk $\mathrm{K}\mathrm{Ti}\mathrm{O}\mathrm{As}{\mathrm{O}}_4$ with broadband phase matching in a noncollinear geometry. The output pulse energy of $1\mathrm{mJ}$ was generated with $50\mathrm{nm}$ of bandwidth by $3.8\mathrm{mJ}$ of pump energy from a $100\mathrm{ps}$, $1\mathrm{kHz}$ Nd:YLF amplified laser. Total gain of ${10}^8$ was achieved in three stages with 32% conversion of the pump energy in the final amplifier stage. Amplified pulses were compressed to $130\mathrm{fs}$ with peak intensities of $3.85\mathrm{GW}$.

© 2007 Optical Society of America

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