Theoretical evaluation of LiGaO_{2} for frequency upconversion to ultraviolet
JOSA B, Vol. 16, Issue 12, pp. 2217-2222 (1999)
http://dx.doi.org/10.1364/JOSAB.16.002217
Acrobat PDF (135 KB)
Abstract
First-principles calculations of the frequency-dependent birefringence, second-harmonic generation, and linear electro-optic response are reported for LiGaO_{2} (which is transparent to as small as 222 nm). Good agreement is obtained with available experimental data in the visible region of the spectrum. The calculated frequency-dependent nonlinear optical responses are surprisingly constant in the entire energy region below the gap and small in absolute value (of the order of 0.2–1.2 pm/V for the various structures considered). Although the birefringence is insufficient for second-harmonic generation into the ultraviolet, opportunities may exist for sum-frequency generation. Angular phase-matching tuning curves are provided. The reasons for the low values of χ^{(2)} are discussed. It is found to be not very sensitive to the structure and to arise in part from a large degree of cancellation between pure interband and mixed intra- and interband contributions.
© 1999 Optical Society of America
OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter
Citation
Sergey N. Rashkeev, Sukit Limpijumnong, and Walter R. L. Lambrecht, "Theoretical evaluation of LiGaO_{2} for frequency upconversion to ultraviolet," J. Opt. Soc. Am. B 16, 2217-2222 (1999)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-16-12-2217
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