Characteristics of efficient few-cycle terahertz radiation generated in as-grown nonlinear organic single crystals |
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Institution: | 1. Division of Energy Systems Research and Department of Physics, Ajou University, Suwon 443-749, Republic of Korea;2. Department of Molecular Science and Technology, Ajou University, Suwon 443-749, Republic of Korea |
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Abstract: | We investigated efficient terahertz wave generation by optical rectification in as-grown nonlinear organic single crystal HMQ-T (2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 4-methylbenzenesulfonate). Optimal thickness of crystals directly available by a slow cooling method in methanol solution enabled us to achieve high-field few-cycle THz waves at 800-nm pumping. With 95-mW pumping at 1-kHz repetition rate, an optical-to-THz conversion efficiency of 2.7 × 10?4 was achieved and the THz electric field strength, measured by electro-optic sampling, was as high as 110.1 kV/cm. Such an efficient THz source based on as-grown HMQ-T crystals can be used for investigation of various nonlinear phenomena in the THz spectral region. |
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Keywords: | Terahertz radiation Nonlinear optics Optical rectification Organic crystals |
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