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

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2024

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Review of Scientific Instruments. AIP Publishing. 2024, 95(8), 083005. ISSN 0034-6748. eISSN 1089-7623. Verfügbar unter: doi: 10.1063/5.0208499

Zusammenfassung

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 us to extract the pulse-to-pulse polarization 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 the FemNoC measurement system. We mathematically model the data acquisition process and identify the essential parameters that 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 optimize FemNoC experiments.

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ISO 690WEISS, Marvin, Franz HERBST, Stefan EGGERT, Makoto NAKAJIMA, Alfred LEITENSTORFER, Sebastian T. B. GOENNENWEIN, Takayuki KURIHARA, 2024. Subharmonic lock-in detection and its optimization for femtosecond noise correlation spectroscopy. In: Review of Scientific Instruments. AIP Publishing. 2024, 95(8), 083005. ISSN 0034-6748. eISSN 1089-7623. Verfügbar unter: doi: 10.1063/5.0208499
BibTex
@article{Weiss2024-08-01Subha-70710,
  title={Subharmonic lock-in detection and its optimization for femtosecond noise correlation spectroscopy},
  year={2024},
  doi={10.1063/5.0208499},
  number={8},
  volume={95},
  issn={0034-6748},
  journal={Review of Scientific Instruments},
  author={Weiss, Marvin and Herbst, Franz and Eggert, Stefan and Nakajima, Makoto and Leitenstorfer, Alfred and Goennenwein, Sebastian T. B. and Kurihara, Takayuki},
  note={Article Number: 083005}
}
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