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First 1.57-Micron-Pumped CdSiP2 Optical Parametric Oscillator (Conference Presentation)
Author(s): Leonard A. Pomeranz; John C. McCarthy; Randy C. Day; Kevin T. Zawilski; Peter G. Schunemann
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Paper Abstract

Cadmium silicon phosphide, CdSiP2 or CSP, exhibits the highest nonlinear Figure of Merit (d2/n3) among all bulk birefringent crystals that can be pumped at wavelengths ≤ 2 microns - and the highest among all nonlinear optical (NLO) crystals at any wavelength with practically low absorption losses. Although a 2-micron pumped optical parametric oscillator (OPO) and numerous 1-micron-pumped CSP OPOs have been demonstrated previously, here we report the first 1.5-micron-pumped CSP OPO. The pump laser for this experiment was a non-critically phase-matched (NCPM) KTP singly-resonant OPO generating 6.3 ns, 10 mj pulses at 1.57 microns, which was in turn pumped by a 1.064-m 5-Hz, 7-ns, 20-mJ Nd:YAG laser. The 1.57-m signal from the KTP OPO pumped a 5x5 mm2 x 5.5-mm long CSP crystal cut for type I phase matching at 63°) inside a linear flat-flat cavity. The measured absorption coefficient at 1570 nm was approximately 0.015cm-1. The input mirror was highly transmitting (97%T) at 1.57 microns and highly reflective from 2.5 to 3.8 microns. The best results were achieved at signal and idler wavelengths of 2.67 microns (50%R output coupling) and 3.83 microns (30%R output coupling) respectively, yielding 2.24 mJ of combined signal and idler output energy for a total optical conversion efficiency of 32%. The slope efficiency was 42%. At 66 MW/cm2 pump peak intensity the OPO was running nearly 4 times over threshold with no signs of roll-over. The CSP crystal was angle-tuned to produce output wavelengths ranging from 2.2 microns to 5.05 microns.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105160Z (14 March 2018); doi: 10.1117/12.2291350
Show Author Affiliations
Leonard A. Pomeranz, BAE Systems (United States)
John C. McCarthy, BAE Systems (United States)
Randy C. Day, BAE Systems (United States)
Kevin T. Zawilski, BAE Systems (United States)
Peter G. Schunemann, BAE Systems (United States)

Published in SPIE Proceedings Vol. 10516:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVII
Konstantin L. Vodopyanov; Kenneth L. Schepler, Editor(s)

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