外文题目: Chromatic effect in a novel THz generation scheme
作者: Li, Bin; Zhang, Wenyan; Liu, Xiaoqing; Deng, Haixiao; Lan, Taihe; Liu, Bo; Liu, Jia; Wang, Xingtao; Zeng, Zhinan; Zhang, Lijian
刊名: New J. Phys.
年: 2017 卷: 19 文章编号：113025
英文关键词:
terahertz radiation; optical rectification; nonlinear optics and parametric processes; optical chirp pulse; pulse-front tilt
OPTICAL RECTIFICATION; TERAHERTZ GENERATION; LITHIUM-NIOBATE; LASER-PULSES; SPECTROSCOPY; LIMITATIONS; EXCITATION; RADIATION; PHASE
英文摘要:
Deriving single or few cycle terahertz (THz) pulse by an intense femtosecond laser through cascaded optical rectification is a crucial technique in cutting-edge time-resolved spectroscopy to characterize micro-scale structures and ultrafast dynamics. Due to the broadband nature of the ultrafast driving laser, the chromatic effect limits the THz conversion efficiency in optical rectification crystals, especially for those implementing the pulse-front tilt scheme, e.g. lithium niobate (LN) crystal, has been prevalently used in the past decade. In this research we developed a brand new type of LN crystal utilizing Brewster coupling, and conducted systematically experimental and simulative investigation for the chromatic effect and multi-dimensionally entangled parameters in THz generation, predicting that an extreme conversion efficiency of similar to 10% would be potentially achievable at the THz absorption coefficient of similar to 0.5 cm(-1). Moreover, we first discovered that the chirp of the driving laser plays a decisive role in the pulse-front tilt scheme, and the THz generation efficiency could be enhanced tremendously by applying an appropriate chirp.


文献类型: 期刊论文
正文语种: English
收录类别: SCI
DOI: 10.1088/1367-2630/aa82e7


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