光学整流
太赫兹辐射
光学
切伦科夫辐射
激光器
材料科学
飞秒
铌酸锂
光电子学
太赫兹光谱与技术
Crystal(编程语言)
二次谐波产生
太赫兹时域光谱学
衰减系数
非线性光学
物理
探测器
程序设计语言
计算机科学
作者
S. B. Bodrov,N. A. Abramovsky,G. K. Paramonov,S. N. Belyaev,A. P. Prokhorov,А. Н. Степанов,М. И. Бакунов
摘要
The potential of KD2PO4 (or DKDP) crystal as a terahertz generator is demonstrated, despite its extremely strong terahertz absorption. By combining the Cherenkov radiation scheme and surface-emitting geometry, femtosecond Ti:sapphire laser pulses of ∼200−300 μJ energy were converted to broadband (∼4 THz bandwidth) terahertz transients with the efficiency of ∼8×10−6. The transients produced electro-optic signals of a ∼0.15 modulation depth and ∼103 dynamic range in a 1-mm thick ZnTe detector crystal. This suggests DKDP as a potential generator crystal for terahertz time-domain spectroscopy. From our measurements, we estimated the nonlinear coefficient d36≈3 pm/V of DKDP for optical rectification, which is an order of magnitude larger than the value known from second-harmonic-generation experiments. At the same time, the obtained value of d36 is an order of magnitude smaller than the value calculated from the clamped electro-optic coefficient r63 for the MHz frequency range. At high pump intensities, we observed multiple filamentation of the pump beam and white light generation, spatially separated from terahertz generation.
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