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Subharmonic lock-in detection and its optimisation for femtosecond noise correlation spectroscopy

handsomeland 添加于 2024-5-17 20:31 | 433 次阅读 | 0 个评论

作者
Weiss MA, Herbst FS, Eggert S, Nakajima M, Leitenstorfer A, Goennenwein STB, Kurihara T
摘要
Although often viewed as detrimental, fluctuations carry valuable information about the physical system from which they emerge. Femtosecond noise correlation spectroscopy (FemNoC) has recently been established to probe the ultrafast fluctuation dynamics of thermally populated magnons by measurement of their amplitude autocorrelation. Subharmonic lock-in detection is the key technique in this method, allowing to extract the pulse-to-pulse polarisation fluctuations of two femtosecond optical pulse trains transmitted through a magnetic sample. Here, we present a thorough technical description of the subharmonic demodulation technique and of the FemNoC measurement system. We mathematically model the data acquisition process and identify the essential parameters which critically influence the signal-to-noise ratio of the signals. Comparing the model calculations to real datasets allows validating the predicted parameter dependences and provides a means to optimise FemNoC experiments.
详细资料
- 关键词: physics.optics; cond-mat.other; physics.ins-det
- 文献种类: Manual Script
- 期卷页: 2024年
- 日期: 2024-03-15
- 发布方式: arXiv e-prints
- 备注:http://arxiv.org/abs/2403.09829v1
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