Achieving a high time resolution is highly desirable for revealing the electron dynamics and light-induced phenomena in time- and angle-resolved photoemission spectroscopy (TrARPES). Here, we identify key factors for achieving the optimum time resolution, including laser bandwidth and optical component induced chirp. A full diagnostic scheme is constructed to characterize the pulse duration and chirp of the fundamental beam, second harmonic, and fourth harmonic, and prism pairs are used to compensate for the chirp. Moreover, by using a Sb2Te3 film as a test sample, we can achieve a high test efficiency for the time resolution during the optimization process. An optimized time resolution of 81 fs is achieved in our TrARPES system with a high repetition rate tunable from 76 to 4.75/n MHz.
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March 2021
Research Article|
March 16 2021
Full diagnostics and optimization of time resolution for time- and angle-resolved photoemission spectroscopy
Changhua Bao
;
Changhua Bao
1
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University
, Beijing 100084, People’s Republic of China
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Laipeng Luo;
Laipeng Luo
1
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University
, Beijing 100084, People’s Republic of China
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Hongyun Zhang
;
Hongyun Zhang
1
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University
, Beijing 100084, People’s Republic of China
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Shaohua Zhou
;
Shaohua Zhou
1
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University
, Beijing 100084, People’s Republic of China
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Zefeng Ren
;
Zefeng Ren
2
State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, 457 Zhongshan Road, Dalian 116023, People’s Republic of China
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Shuyun Zhou
Shuyun Zhou
a)
1
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University
, Beijing 100084, People’s Republic of China
3
Frontier Science Center for Quantum Information
, Beijing 100084, People’s Republic of China
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Rev. Sci. Instrum. 92, 033904 (2021)
Article history
Received:
January 19 2021
Accepted:
March 02 2021
Citation
Changhua Bao, Laipeng Luo, Hongyun Zhang, Shaohua Zhou, Zefeng Ren, Shuyun Zhou; Full diagnostics and optimization of time resolution for time- and angle-resolved photoemission spectroscopy. Rev. Sci. Instrum. 1 March 2021; 92 (3): 033904. https://doi.org/10.1063/5.0044815
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