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 1.5μm range. This amplifier is based on 1.05μm pumping of bulk KTiOAsO4 with broadband phase matching in a noncollinear geometry. The output pulse energy of 1mJ was generated with 50nm of bandwidth by 3.8mJ of pump energy from a 100ps, 1kHz Nd:YLF amplified laser. Total gain of 108 was achieved in three stages with 32% conversion of the pump energy in the final amplifier stage. Amplified pulses were compressed to 130fs with peak intensities of 3.85GW.

© 2007 Optical Society of America

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