In this study, an extreme ultraviolet (EUV) conversion efficiency (CE) of 6.9% was obtained in simulation by controlling the delay between a picosecond pre-pulse and a main-pulse with a wavelength of 2 μm; this value is about 7.5% higher than the ns pre-pulse scheme of the EUV emission produced by a 2 μm laser-driven tin-droplet target. In the simulation, the tin droplet expanded into hollow spherical structures after irradiation with a picosecond pre-pulse laser. Notably, compared with a nanosecond pre-pulse, in this case, the density of the tin plasma was lower, and the expansion range was wider for the same delay. Therefore, ps pre-pulse can make the tin plasma reach the optimal state of EUV emission in a shorter delay. In both pre-pulse schemes, the CE value maintains a high value (>5.7%) within a certain delay range (800 ns) between pre-pulse and main-pulse. In this study, the FLASH radiation hydrodynamic code and FLYCHK atomic code were used to investigate the energy conversion and spectra. The results obtained can be potentially useful for EUV lithography under a two-pulse scheme.
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April 2023
Research Article|
April 14 2023
Enhanced extreme ultraviolet conversion efficiency of a 2 μm laser-driven preformed tin-droplet target using short picosecond pre-pulses
Special Collection:
Plasma Sources for Advanced Semiconductor Applications
Z. Y. Shi
;
Z. Y. Shi
(Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft)
1
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS)
, Shanghai 201800, China
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Y. Yuan
;
Y. Yuan
(Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Writing – original draft)
2
School of Nuclear Science and Technology, University of South China
, Hengyang 421001, China
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W. P. Wang
;
W. P. Wang
a)
(Conceptualization, Data curation, Formal analysis, Methodology, Project administration, Resources, Supervision, Writing – review & editing)
1
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS)
, Shanghai 201800, China
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Y. Y. Ma
;
Y. Y. Ma
a)
(Conceptualization, Data curation, Resources, Software, Supervision, Writing – review & editing)
3
College of Advanced Interdisciplinary Studies, National University of Defense Technology
, Changsha 410073, China
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X. Y. Sun
;
X. Y. Sun
(Investigation, Visualization, Writing – original draft)
1
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS)
, Shanghai 201800, China
4
University of Chinese Academy of Sciences
, Beijing 100049, China
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N. Lin
;
N. Lin
(Conceptualization, Investigation, Resources, Supervision)
1
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS)
, Shanghai 201800, China
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Y. X. Leng
Y. X. Leng
(Conceptualization, Data curation, Formal analysis, Investigation, Resources, Software, Supervision)
1
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS)
, Shanghai 201800, China
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Note: This paper is part of the Special Topic: Plasma Sources for Advanced Semiconductor Applications.
Phys. Plasmas 30, 043107 (2023)
Article history
Received:
November 28 2022
Accepted:
March 13 2023
Citation
Z. Y. Shi, Y. Yuan, W. P. Wang, Y. Y. Ma, X. Y. Sun, N. Lin, Y. X. Leng; Enhanced extreme ultraviolet conversion efficiency of a 2 μm laser-driven preformed tin-droplet target using short picosecond pre-pulses. Phys. Plasmas 1 April 2023; 30 (4): 043107. https://doi.org/10.1063/5.0136768
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