Abstract

We present the design and characterization of a tunable mid-IR optical parametric amplifier (OPA) with a 1 MHz 1033 nm fiber laser pump source. The OPA generates >10  nJ/pulse tunable from 3–7.5 μm with 85165  cm1 bandwidth and 140–540 fs pulse durations. The design utilizes a single stage of collinear, Type I amplification in lithium gallium sulfide (LGS) seeded by the near-IR portion of a super-continuum (SC) generated in yttrium aluminum garnet (YAG). The resulting mid-IR idler beam is isolated as the output. This single-stage OPA is a simple and convenient source of high-repetition-rate, tunable mid-IR radiation for high-throughput ultrafast infrared spectroscopy.

© 2018 Optical Society of America

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