Dr. Jianwei Meng Profile

Dr. Jianwei Meng

at ShanghaiTech Univ.

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Publications (2)

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Proceedings Article | 28 November 2023 Poster + Paper

Design of a soft x-ray free-electron lasers arrival time diagnostic device

Haoyu Wei, Kaiyu Zhang, Ruixue Zhu, Jianwei Meng, Tsu-Chien Weng

Proceedings Volume 12765, 127651C (2023) https://doi.org/10.1117/12.2686629

KEYWORDS: X-rays, Free electron lasers, Ultrafast phenomena, Diagnostics, Laser optics

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Soft X-ray free-electron lasers (FELs) have gained significant attention as a research tool in X-ray ultrafast spectroscopy due to their ultra-high pulse brightness and ultra-short duration. Combined with an independent optical laser to perform pump-probe experiments with time resolution has wide-ranging application value and can have great impact on ultrafast dynamics research in fields such as energy catalysis, solid state physics, materials science, and biology. However, the inherent temporal and spatial jitter of soft X-ray FEL pulses significantly limits the time resolution in these experiments due to the low level of synchronization between the two independent light sources. Here, we present a spatiotemporal coupling device suitable for soft X-ray FELs. The device uses a self-designed four-blade slit device which is suitable for ultra-high vacuum environments to complete the spatial coupling between the two foci of both the soft X-ray FEL and optical laser, reducing the negative effects caused by spatial jitter of soft X-ray FEL beam spots. Based on this, a wavefront-splitting scheme is used to reflect and separate approximately 30% of the soft X-ray FEL beam for arrival time diagnosis. Based on the principle of transient decrease in the reflectivity of semiconductor material surfaces induced by X-rays, precise time measurement is achieved on a shot-by-shot basis through spectral encoding. After experiments, the data is rearranged according to the arrival time delay between the two pulses, effectively increasing the time resolution of the pump-probe experiment to the femtosecond scale.

Proceedings Article | 4 December 2020 Paper

A soft x-ray emission flat-field grating spectrometer for time-resolved spectroscopy

Xiaowei Yang, Jianwei Meng, Peng Liu, Xing Liu, Tsu-Chien Weng

Proceedings Volume 11617, 1161707 (2020) https://doi.org/10.1117/12.2584349

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A time-resolved soft X-ray emission spectrometer covering 250-620 eV is presented for the study of chemical reaction processes. Contrary to conventional time-resolved spectrometer, our spectrometer can obtain a two-dimensional timeenergy map in single shot by adding an imaging mirror to the flat-field spectrometer. The temporal changes are spatially encoded in the footprint of the probe X-ray beam on the sample via grazing incidence geometry. The flat-field spectrometer design is chosen to alleviate the aberration of the imaging mirror. The spectrometer is optimized at 400 eV, targeting at over 2000 resolving power and sub-picosecond time resolution.

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