期刊
STRUCTURAL DYNAMICS-US
卷 4, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4978042
关键词
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资金
- European Cluster of Advanced Laser Light Sources (EUCALL) project from the European Union's Horizon research and innovation programme [654220]
- European Research Council [681917]
- U.S. Department of Energy, Office of Science [DE-AC02-76SF00515]
- German Federal Ministry of Education and Research - BMBF [05K12CH4]
- European Research Council (ERC) [681917] Funding Source: European Research Council (ERC)
Understanding dynamics on ultrafast timescales enables unique and new insights into important processes in the materials and life sciences. In this respect, the fundamental pump-probe approach based on ultra-short photon pulses aims at the creation of stroboscopic movies. Performing such experiments at one of the many recently established accelerator-based 4th-generation light sources such as freeelectron lasers or superradiant THz sources allows an enormous widening of the accessible parameter space for the excitation and/or probing light pulses. Compared to table-top devices, critical issues of this type of experiment are fluctuations of the timing between the accelerator and external laser systems and intensity instabilities of the accelerator-based photon sources. Existing solutions have so far been only demonstrated at low repetition rates and/or achieved a limited dynamic range in comparison to table-top experiments, while the 4th generation of accelerator-based light sources is based on superconducting radio-frequency technology, which enables operation at MHz or even GHz repetition rates. In this article, we present the successful demonstration of ultra-fast accelerator-laser pump-probe experiments performed at an unprecedentedly high repetition rate in the few-hundred-kHz regime and with a currently achievable optimal time resolution of 13 fs (rms). Our scheme, based on the pulse-resolved detection of multiple beam parameters relevant for the experiment, allows us to achieve an excellent sensitivity in real-world ultra-fast experiments, as demonstrated for the example of THz-field-driven coherent spin precession. (C) 2017 Author(s).
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