Characterization of infrared free electron laser output profile through sum frequency generation spectroscopy

IF 1.1 4区化学 Q3 SPECTROSCOPY Spectroscopy Letters Pub Date : 2023-04-21 DOI:10.1080/00387010.2023.2201294

W. Guo, Qiantong Song, Jiawei Xue, Zhichao Huangfu, Yuhan He, Yongyan Zhang, XiaoLin Liu, Jun Bao, Zhaohui Wang

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Abstract

Abstract Infrared free electron laser is a unique broadband tuning IR light source and useful tool to trace the reaction and vibrational energy transfer dynamics. It is essential for the infrared free electron laser debug and optimization to accurately characterize the wavelength and micropulse profile of the infrared free electron laser output. By synchronizing the infrared free electron laser and tabletop femtosecond laser with high precision, infrared free electron laser-sum frequency generation setup, a sum frequency generation spectroscopy setup using infrared free electron laser pulses, is developed. Through sum frequency generation cross-correlation, the infrared free electron laser output wavelength and micropulse duration are measured from the delaytime-dependent infrared free electron laser-sum frequency generation spectra of a ZnS window. The infrared free electron laser-sum frequency generation measured infrared free electron laser wavelength is linearly correlated with the theoretically calculation with the fixed electron beam energy and variable undulator magnetic gaps. And the measured micropulse duration is 2.0 ps@5.25 µm and 2.9 ps@8.35 µm. These results demonstrate the excellent ability of sum frequency generation in the diagnostic and characterization of infrared free electron laser output profile, and the quality of the infrared free electron laser pulse structure.

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和频产生光谱法表征红外自由电子激光输出谱

摘要红外自由电子激光器是一种独特的宽带调谐红外光源，是跟踪反应和振动能量传递动力学的有用工具。准确表征红外自由电子激光输出的波长和微脉冲轮廓对红外自由电子激光器的调试和优化至关重要。通过高精度同步红外自由电子激光器和桌面飞秒激光器，开发了一种利用红外自由电子激光脉冲的红外自由电子-激光和频生成光谱装置。通过和频生成互相关，从ZnS窗口的延迟时间相关红外自由电子激光和频生成光谱中测量了红外自由电子激光器的输出波长和微脉冲持续时间。在固定电子束能量和可变波荡器磁隙的情况下，测得的红外自由电子激光波长与理论计算呈线性相关。测得的微脉冲持续时间为2.0 ps@5.25 µm和2.9 ps@8.35 µm。这些结果证明了和频生成在红外自由电子激光输出轮廓的诊断和表征中的优异能力，以及红外自由电子激光器脉冲结构的质量。

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来源期刊

Spectroscopy Letters 物理-光谱学

CiteScore

2.90

自引率

5.90%

发文量

审稿时长

1.3 months

期刊介绍： Spectroscopy Letters provides vital coverage of all types of spectroscopy across all the disciplines where they are used—including novel work in fundamental spectroscopy, applications, diagnostics and instrumentation. The audience is intended to be all practicing spectroscopists across all scientific (and some engineering) disciplines, including: physics, chemistry, biology, instrumentation science, and pharmaceutical science.