Journal
OPTICAL MATERIALS
Volume 33, Issue 4, Pages 647-654Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2010.11.021
Keywords
Solid-state laser materials; Fluoborate; Optical microscopy; Frequency doubling
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Funding
- Nature Science Foundation of Education Department of Anhui Province [KJ2010B203, KJ2010B205]
- Science Foundation of Shandong Province [ZR2009BM041]
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In this paper, the polarized absorption and fluorescence spectra of Nd3+ ion in the BaCaBO3F non-linear optical crystal have been investigated at room temperature. The Judd-Ofelt theory, extended to anisotropic system, has been applied to calculate the phenomenological intensity parameters, spontaneous transition probabilities, branching ratios and radiative lifetimes. The maximum emission cross-sections have been calculated to be 7.22 x 10(-20) cm(2) and 15.21 x 10(-20) cm(2) at 1068 nm for pi- and sigma-polarization using the Fuchtbauer-Ladenburg (F-L) equation. The fluorescence lifetime of F-4(3/2) manifold is equal to 57.7 mu s, and the quantum efficiency is 26.8%, which is higher than those of most of other borates. The potential of Nd3+:8aCaBO(3)F as a new self-frequency doubling laser crystal has also been evaluated preliminarily. Appreciable self-absorption at the second-harmonic wavelength of Nd3+:BaCaBO3F crystal should be considered for further laser operations. (C) 2010 Elsevier B.V. All rights reserved.
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