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Proceedings Paper

Compact 12mJ mid-IR pulsed source using an intracavity KTA OPO followed by a CSP OPA
Author(s): Brian Cole; Lew Goldberg; John Nettleton; Kevin T. Zawilski; Leonard A. Pomeranz; Peter G. Schunemann; John C. McCarthy
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Paper 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.

Paper Details

Date Published: 21 February 2020
PDF: 9 pages
Proc. SPIE 11259, Solid State Lasers XXIX: Technology and Devices, 1125907 (21 February 2020); doi: 10.1117/12.2547520
Show Author Affiliations
Brian Cole, U.S. Army Combat Capabilities Development Command C5ISR (United States)
Lew Goldberg, U.S. Army Combat Capabilities Development Command C5ISR (United States)
John Nettleton, U.S. Army Combat Capabilities Development Command C5ISR (United States)
Kevin T. Zawilski, BAE Systems (United States)
Leonard A. Pomeranz, BAE Systems (United States)
Peter G. Schunemann, BAE Systems (United States)
John C. McCarthy, BAE Systems (United States)

Published in SPIE Proceedings Vol. 11259:
Solid State Lasers XXIX: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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