Possibility of high‑energy THz generation in LiTaO3

Tokodi, Levente and Buzády, Andrea and Hebling, János and Pálfalvi, László (2016) Possibility of high‑energy THz generation in LiTaO3. APPLIED PHYSICS B - LASERS AND OPTICS, 122. No. 235. ISSN 0946-2171, ESSN: 1432-0649

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Abstract

Due to the absence of the detrimental three-photon absorption, LiTaO3 is a promising crystal for terahertz generation when pumping with an 800-nm pump wavelength. The nonlinear optical, photorefractive and dielectric (except the bandwidth) properties at the optical and the terahertz wavelength are very similar to those of LiNbO3. The absorption coefficient and refractive index spectra of 1 mol% Mg-doped stoichiometric LiTaO3 measured by terahertz time domain spectroscopy are presented. Optimization calculations have been performed, and results for a hybrid-type high-energy terahertz source using LiTaO3 are presented. About 90 % diffraction efficiency is predicted with a practically feasible contact grating.

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