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arXiv 2003.117152020-03-26physics.optics

Generation of 0.7 mJ multicycle 15 THz radiation by phase-matched optical rectification in lithium niobate

Dogeun Jang, Jae Hee Sung, Seong Ku Lee, Chul Kang, Ki-Yong Kim

备注：: 4 figures
DOI：: 10.1364/OL.393913

英文摘要：

We demonstrate efficient multicycle terahertz pulse generation at 14.6 THz from large-area lithium niobate crystals by using high-energy (up to 2 J) femtosecond Ti:sapphire laser pulses. Such terahertz radiation is produced by phase-matched optical rectification in lithium niobate. Experimentally, we achieve maximal terahertz energy of 0.71 mJ with conversion efficiency of $\sim$0.04%. We also find that the effective interaction length for optimal terahertz conversion is fundamentally limited by terahertz absorption, laser pulse stretching by material dispersion, and terahertz-induced nonlinear cascading effects on the driving laser pulse.

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