High energy Yb:CaF2 femtosecond laser for efficient terahertz generation in lithium niobate

Vicario, C. and Monoszlai, Balázs and Lombosi, Csaba and Mareczko, A. and Courjaud, A. and Fülöp, József András and Hauri, C. P. (2014) High energy Yb:CaF2 femtosecond laser for efficient terahertz generation in lithium niobate. PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING, 8964. ISSN 0277-786X

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Abstract

We present a study on THz generation in lithium niobate pumped by a powerful and versatile Yb:CaF2 laser. The unique laser system delivers transform-limited pulses of variable duration (0.38-0.65 ps) with pulse energy of up to 15 mJ at a center wavelength of 1030 nm. From theoretical investigations it is expected that those laser parameters are ideally suited for efficient THz generation. Here we present experimental results on both the conversion efficiency and the THz spectral shape for variable pump pulse durations and for different crystal temperatures down to 25 K. We experimentally verify the optimum pump parameters for most efficient and broadband THz generation.

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