Abstract
We have investigated the generation of THz radiation in lithium ternary compounds LiInSe2, LiGaSe2, LiInS2, LiGaS2 and characterized these materials by THz time-domain spectroscopy. Using 800 nm femtosecond excitation pulse, all crystals produce THz radiation due to an optical rectification corresponding to the nonlinear optical coefficient d 33. We have measured refractive indices along the x-axis and the z-axis for all crystals in the range 150–700 μm and fitted them by using Sellmeier equation. With respect to the obtained results, velocity-matching between the incident laser pulse and the generated THz wave cannot be achieved at 800 nm, but for shorter wavelengths. Hence, an enhanced THz generation in Lithium ternary compounds may be observed by using a laser emitting below 800 nm.
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Acknowledgments
K. Takeya gratefully acknowledges the Osaka University Global COE Program “Center for Electronic Devices Innovation”. We would like to thank Prof. Juraj Darmo (Vienna University of Technology) for his helpful discussions and comments.
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Takeya, K., Takemoto, Y., Kawayama, I. et al. Terahertz Generation and Optical Properties of Lithium Ternary Chalcogenide Crystals. J Infrared Milli Terahz Waves 32, 426–433 (2011). https://doi.org/10.1007/s10762-011-9768-7
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DOI: https://doi.org/10.1007/s10762-011-9768-7