Compact 12mJ mid-IR pulsed source using an intracavity KTA OPO followed by a CSP OPA

Brian Cole; Lew Goldberg; John Nettleton; Kevin T. Zawilski; Leonard A. Pomeranz; Peter G. Schunemann; John C. McCarthy

doi:10.1117/12.2547520

21 February 2020 Compact 12mJ mid-IR pulsed source using an intracavity KTA OPO followed by a CSP OPA

Brian Cole, Lew Goldberg, John Nettleton, Kevin T. Zawilski, Leonard A. Pomeranz, Peter G. Schunemann, John C. McCarthy

Proceedings Volume 11259, Solid State Lasers XXIX: Technology and Devices; 1125907 (2020) https://doi.org/10.1117/12.2547520
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

We describe a compact mid-IR source utilizing an intracavity, non-critically phase matched potassium titanyle arsenate (KTA) optical parametric oscillator (OPO) placed inside a passively Q-switched (PQS), 1.06μm Nd:YAG laser resonator. The 20mm long KTA intracavity OPO was singly resonant, with the output coupler coated for partial reflectivity of 60% at the 1.5μm signal emission and for high transmission at the 3.5μm idler wavelength. With the Nd:YAG pumped by a 3-λ 12-bar diode stack at 5Hz PRF, the OPO generated a maximum 20mJ signal pulse at 1.5μm and 8.8mJ idler pulse at 3.5μm. A cadmium silicon phosphide optical parametric amplifier (OPA), phase matched for 1.5μm-pumped amplification of the 3.5μm OPO idler, was placed in the near field of the intracavity OPO to further increase the mid-IR pulse energy. A maximum 3.5μm pulse energy of 12.1mJ was measured after the OPA, with an additional 4.0mJ measured at 2.8μm. The 3.5μm pulses had a temporal duration of 20ns, corresponding to a peak-power of 605kW. This paper will detail the Nd:YAG pumped intracavity KTA OPO/CSP OPA and optimization of its performance for maximizing the mid-IR pulse energy.

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Brian Cole, Lew Goldberg, John Nettleton, Kevin T. Zawilski, Leonard A. Pomeranz, Peter G. Schunemann, and John C. McCarthy "Compact 12mJ mid-IR pulsed source using an intracavity KTA OPO followed by a CSP OPA", Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 1125907 (21 February 2020); https://doi.org/10.1117/12.2547520

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