Electron paramagnetic resonance (EPR) and optical studies of intrinsic point defects in BaGa4Se7 crystals

Christopher A. Lenyk; Timothy Gustafson; Brian Holloway; Kevin Zawilski; Peter Schunemann; Larry Halliburton; Nancy Giles

doi:10.1117/12.2581856

5 March 2021 Electron paramagnetic resonance (EPR) and optical studies of intrinsic point defects in BaGa4Se7 crystals

Christopher A. Lenyk, Timothy Gustafson, Brian Holloway, Kevin Zawilski, Peter Schunemann, Larry Halliburton, Nancy Giles

Author Affiliations +

Proceedings Volume 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX; 116700O (2021) https://doi.org/10.1117/12.2581856
Event: SPIE LASE, 2021, Online Only

Abstract

BaGa4Se7 is a promising new nonlinear optical material with a reported bandgap of 2.64 eV, and a broad spectral range out to 18 microns. Our experimental investigations use a variety of light sources from 325 – 442 nm below 160 K revealing the presence of an electron paramagnetic resonance (EPR) spectrum that is tentatively assigned to singly ionized selenium vacancies in the bulk single crystals, while 633 nm light is shown to remove the photoinduced signal. We correlate EPR results with optical data obtained using temperature-dependent absorption, thermoluminescence, and photoluminescence to investigate and characterize a broad absorption band resulting from illumination.

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Christopher A. Lenyk, Timothy Gustafson, Brian Holloway, Kevin Zawilski, Peter Schunemann, Larry Halliburton, and Nancy Giles "Electron paramagnetic resonance (EPR) and optical studies of intrinsic point defects in BaGa4Se7 crystals", Proc. SPIE 11670, Nonlinear Frequency Generation and Conversion: Materials and Devices XX, 116700O (5 March 2021); https://doi.org/10.1117/12.2581856

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