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arXiv · 2608.13794

Intracavity THz generation using a thin lithium niobate plate in a compact Kerr-lens mode-locked Yb:CALGO bulk oscillator

Mohsen Khalili·Jokūbas Pimpė·Yicheng Wang·Julius Vengelis·Kore Hasse·Sergiy Suntsov·Detlef Kip·Clara J. Saraceno
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Abstract

We demonstrate intracavity terahertz (THz) generation via optical rectification in a 50-m-thick lithium niobate crystal placed inside a compact diode-pumped Kerr-lens mode-locked (KLM) Yb:CALGO bulk oscillator. The oscillator operates at a repetition rate of 85 MHz and delivers 83-fs pulses with up to 71 W of average intracavity power, obtained with only 21.4 W of low-cost multimode diode pump power. We generate single-cycle THz pulses with a spectrum extending up to 3 THz, detected by electro-optic sampling with 60 dB dynamic range within 156 s of measurement time (313 averaged traces) and up to 120 W of THz average power. This work combines the high damage threshold, power-handling capability, and cost-effectiveness of thin LN plates with simplicity, compactness, and low-cost multimode diode-pumped solid-state bulk lasers, offering an attractive alternative for high-repetition-rate THz time-domain spectroscopy systems.

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Mohsen Khalili, Jokūbas Pimpė, Yicheng Wang, Julius Vengelis, Kore Hasse, Sergiy Suntsov, Detlef Kip, Clara J. Saraceno. 2026-09-18. Intracavity THz generation using a thin lithium niobate plate in a compact Kerr-lens mode-locked Yb:CALGO bulk oscillator. https://arxiv.org/abs/2608.13794

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