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Deriving single or few cycle terahertz pulse (THz) by intense femtosecondlaser through cascaded optical rectification in electro-optic crystals is acrucial technique in cutting-edge time-resolved spectroscopy to characterizemicro-scale structures and ultrafast dynamics. In the past decade, lithiumniobate (LN) crystal implementation of wave-front tilt scheme has beenprevalently used, while painstaking efforts have been invested in order toachieve higher THz conversion efficiency. In this research we developed a brandnew type of LN crystal possessing dual-face-cut and Brewster coupling, andconducted experimental and simulative investigation systematically to optimizethe multi-dimensionally entangled parameters in THz generation, predicting theextreme conversion efficiency of 10% is potentially promising at the THzabsorption coefficient of 0.5cm-1. More remarkably, we first discovered thatthe chirp of the driving laser pulse plays a decisive role in the wave-fronttilt scheme, and the THz generation efficiency could be enhanced tremendouslyby applying an appropriate chirp.

Chromatic Effect for THz Generation in a Novel Wave-front Tilt Scheme