Minimizing 1-micron absorption losses in CdSiP2

Kevin T. Zawilski; Peter G. Schunemann; Timothy D. Gustafson; Larry Halliburton; Nancy Giles; Kent Averett; Jonathan Slagle; Shekhar Guha; Robert Murray

doi:10.1117/12.2655201

17 March 2023 Minimizing 1-micron absorption losses in CdSiP2

Kevin T. Zawilski, Peter G. Schunemann, Timothy D. Gustafson, Larry Halliburton, Nancy Giles, Kent Averett, Jonathan Slagle, Shekhar Guha, Robert Murray

Author Affiliations +

Proceedings Volume PC12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII; PC124050E (2023) https://doi.org/10.1117/12.2655201
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Cadmium silicon phosphide, CdSiP2 (CSP), exhibits the highest d-coefficient (d36 = 85 pm/V) among all practical nonlinear optical crystals. Its large band gap of 2.45 eV allows for 1-micron pumping with widely-available Nd- and Yb-based laser sources, and its dispersion properties are such that a 1-um pump yields non-critically phase-matched temperature-tunable output between 6.2-6.5 um (an attractive range for minimally-invasive laser surgery). However, residual 1-um absorption losses in CSP are not insignificant (0.16-0.2 cm-1). In this work we focused on identifying, and ultimately minimizing, the point defects responsible for these losses by correlating EPR spectra with polarized absorption near 1-um.

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Kevin T. Zawilski, Peter G. Schunemann, Timothy D. Gustafson, Larry Halliburton, Nancy Giles, Kent Averett, Jonathan Slagle, Shekhar Guha, and Robert Murray "Minimizing 1-micron absorption losses in CdSiP2", Proc. SPIE PC12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII, PC124050E (17 March 2023); https://doi.org/10.1117/12.2655201

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