A vacuum ultraviolet laser with a submicrometer spot for spatially resolved photoemission spectroscopy

Yuanhao Mao; Dong Zhao; Shen Yan; Hongjia Zhang; Juan Li; Kai Han; Xiaojun Xu; Chuan Guo; Lexian Yang; Chaofan Zhang; Kun Huang; Yulin Chen

doi:10.1038/s41377-021-00463-3

Light: Science & Applications (Jan 2021)

A vacuum ultraviolet laser with a submicrometer spot for spatially resolved photoemission spectroscopy

Yuanhao Mao,
Dong Zhao,
Shen Yan,
Hongjia Zhang,
Juan Li,
Kai Han,
Xiaojun Xu,
Chuan Guo,
Lexian Yang,
Chaofan Zhang,
Kun Huang,
Yulin Chen

Affiliations

Yuanhao Mao: College of Advanced Interdisciplinary Studies, National University of Defense Technology
Dong Zhao: Department of Optics and Optical Engineering, University of Science and Technology of China
Shen Yan: College of Advanced Interdisciplinary Studies, National University of Defense Technology
Hongjia Zhang: College of Intelligence Science and Technology, National University of Defense Technology
Juan Li: Department of Optics and Optical Engineering, University of Science and Technology of China
Kai Han: College of Advanced Interdisciplinary Studies, National University of Defense Technology
Xiaojun Xu: College of Advanced Interdisciplinary Studies, National University of Defense Technology
Chuan Guo: College of Advanced Interdisciplinary Studies, National University of Defense Technology
Lexian Yang: State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University
Chaofan Zhang: College of Advanced Interdisciplinary Studies, National University of Defense Technology
Kun Huang: Department of Optics and Optical Engineering, University of Science and Technology of China
Yulin Chen: State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University

DOI: https://doi.org/10.1038/s41377-021-00463-3
Journal volume & issue: Vol. 10, no. 1
pp. 1 – 8

Abstract

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Abstract Vacuum ultraviolet (VUV) lasers have demonstrated great potential as the light source for various spectroscopies, which, if they can be focused into a small beam spot, will not only allow investigation of mesoscopic materials and structures but also find application in the manufacture of nano-objects with excellent precision. In this work, we report the construction of a 177 nm VUV laser that can achieve a record-small (~0.76 μm) focal spot at a long focal length (~45 mm) by using a flat lens without spherical aberration. The size of the beam spot of this VUV laser was tested using a metal grating and exfoliated graphene flakes, and we demonstrated its application in a fluorescence spectroscopy study on pure and Tm3+-doped NaYF4 microcrystals, revealing a new emission band that cannot be observed in the traditional up-conversion process. In addition, this laser system would be an ideal light source for spatially and angle-resolved photoemission spectroscopy.

Published in Light: Science & Applications

ISSN: 2047-7538 (Online)
Publisher: Nature Publishing Group
Country of publisher: United Kingdom
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: https://www.nature.com/lsa/

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