Progress toward an efficient, uniformly scalable lithium niobate terahertz pulse source

Krizsán, Gergő and Jurasits, Bálint and Almási, Gábor and Hebling, János (2025) Progress toward an efficient, uniformly scalable lithium niobate terahertz pulse source. OPTICS LETTERS, 50 (13). pp. 4250-4253. ISSN 0146-9592

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Abstract

We report significant progress in developing a compact, imaging-free, and scalable tilted-pulse-front-pumped (TPFP) terahertz (THz) source based on a nonlinear echelon slab. The slab thickness- and pump intensity-dependent THz generation efficiency have been characterized, reaching an efficiency of similar to 0.085%, which is similar to 2.8x higher than previously. The impact of microstructure quality shows that surface roughness reduces efficiency by lowering diffraction efficiency and increasing beam divergence. A simple theoretical model is introduced, which shows good agreement with experimental results and predicts significantly higher efficiency-exceeding 0.65% (2%) at room (cryogenic) temperature-with refined microstructure quality. (c) 2025 Optica Publishing Group. All rights, including for text and data nologies, are reserved.

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