Ms. Madalina M. Chirila Profile

Madalina M. Chirila

at West Virginia Univ

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Proceedings Article | 30 May 2003 Paper

Identification of point defects responsible for laser-induced ultraviolet absorption in LiB3O5 (LBO) crystals

W. Hong, Nelson Garces, M. Chirila, Larry Halliburton

Proceedings Volume 4932, (2003) https://doi.org/10.1117/12.472429

KEYWORDS: Crystals, Ions, Boron, Laser induced breakdown spectroscopy, Oxygen, Lithium, Copper, Nonlinear crystals, Absorption, Laser crystals

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Electron paramagnetic resonance (EPR) has been used to identify and characterize point defects in lithium triborate (LiB₃O₅) crystals grown for nonlinear optical applications. As-grown crystals contain oxygen vacancies and lithium vacancies (as well as trace amounts of transition-metal ions in a few samples). Exposing a crystal to ionizing radiation at 77 K produces “free” electrons and holes. These electrons are trapped at the pre-existing oxygen vacancies and give rise to an EPR signal with a large hyperfine from one ¹¹B nucleus. The corresponding holes become self-trapped on oxygen ions as a result of the significant lattice relaxation of a nearest-neighbor fourfold-bonded boron ion. This gives rise to an EPR signal with a smaller ¹¹B hyperfine pattern due to the oxygen’s threefold bonded boron neighbor. Warming the crystal to approximately 130 K destroys the self-trapped hole centers that were initially formed, and allows a second holelike signal to be observed (which in turn decays between 150 and 200 K). The structure of the second hole center is very similar to the self-trapped hole center and a neighboring lithium vacancy makes this latter center more thermally stable. The EPR spectra from Ni⁺ and Cu²⁺ ions are also reported.

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