In this paper, we present results about a high energy picosecond Holmium YLF laser developed in order to be used as the puming laser for the first mid-IR optical parametric chirped pulse amplifier (OPCPA) operating at a center wavelength of 7 μm with output parameters suitable already for strong-field experiments. It is also the first demonstration of an Optical Parametric Chirped Pulse Amplifier (OPCPA) using a 2 μm laser pump source which enables the use of nonoxide nonlinear crystals with typically limited transparency at 1 mm wavelength. This new OPCPA system is alloptically synchronized and generates 0.2 mJ energy, CEP stable optical pulses. The pulses are currently compressed to sub-8 optical cycles but support a sub-4 cycle pulse duration. The discrepancy in compression is due to uncompensated higher order phase from the grating compressor which will be addressed in the future.
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Daniel Sanchez, Jens Biegert, Guillaume Matras, Christophe Simon-Boisson, "High energy high repetition rate compact picosecond Holmium YLF laser for mid-IR OPCPA pumping," Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 100820N (17 February 2017);