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arXiv · 2510.24158

Development of a 10.8-eV Tabletop Femtosecond Laser with Tunable Polarization for High-Resolution Angle-Resolved Photoemission Spectroscopy

Jisong Gao·Qiaoxiao Zhao·Wenbo Liu·Dong Li·Zhicheng Gao·Yudian Zhou·Xuegao Hu·Zhihao Cai·Zhilin Li·Youguo Shi·Peng Cheng·Zhaojun Liu·Lan Chen·Kehui Wu·Zhigang Zhao·Baojie Feng
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Abstract

The development of extreme ultraviolet sources is critical for advancing angleresolved photoemission spectroscopy (ARPES), a powerful technique for probing the electronic structure of materials. Here, we report the construction of a tabletop 10.8-eV femtosecond laser through cascaded third-harmonic generation, which operates at a repetition rate of 1 MHz and delivers a photon flux of approximately 1012 photons/s. The system achieves a high energy resolution of approximately 11.8 meV and tunable polarization. This flexibility enables detailed studies of orbitaland (pseudo)spin characteristics in quantum materials. We demonstrate the capabilities of this laser-ARPES system by investigating several prototypical materials, showcasing its potential for elucidating complex phenomena in quantum materials.

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Jisong Gao, Qiaoxiao Zhao, Wenbo Liu, Dong Li, Zhicheng Gao, Yudian Zhou, Xuegao Hu, Zhihao Cai, Zhilin Li, Youguo Shi, Peng Cheng, Zhaojun Liu, Lan Chen, Kehui Wu, Zhigang Zhao, Baojie Feng. 2025-10-28. Development of a 10.8-eV Tabletop Femtosecond Laser with Tunable Polarization for High-Resolution Angle-Resolved Photoemission Spectroscopy. https://doi.org/10.1063/5.0268243

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