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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
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Subharmonic lock-in detection and its optimization for femtosecond noise correlation spectroscopy
M A Weiss1, F S Herbst1, S Eggert1
1Department of Physics, University of Konstanz, D-78457 Konstanz, Germany.
The Review of Scientific Instruments
|August 20, 2024
Summary
Femtosecond noise correlation spectroscopy (FemNoC) reveals ultrafast dynamics of magnetic excitations called magnons. This study details the FemNoC system and its subharmonic lock-in detection for optimizing experiments.
Area of Science:
- Condensed Matter Physics
- Ultrafast Spectroscopy
- Magnetism
Background:
- Fluctuations in physical systems contain valuable dynamic information.
- Femtosecond noise correlation spectroscopy (FemNoC) probes ultrafast dynamics of thermally populated magnons.
- Subharmonic lock-in detection is crucial for extracting polarization fluctuations in FemNoC.
Purpose of the Study:
- To provide a comprehensive technical description of the FemNoC measurement system.
- To detail the subharmonic demodulation technique used in FemNoC.
- To optimize FemNoC experiments by understanding critical parameters.
Main Methods:
- Utilized subharmonic lock-in detection to measure pulse-to-pulse polarization fluctuations.
- Developed a mathematical model for the FemNoC data acquisition process.
- Analyzed the influence of essential parameters on signal-to-noise ratio.
Main Results:
- Identified key parameters affecting the signal-to-noise ratio in FemNoC measurements.
- Validated model predictions by comparing calculations with experimental datasets.
- Demonstrated the capability to optimize FemNoC experiments based on parameter analysis.
Conclusions:
- The presented technical description and mathematical model enhance the understanding of FemNoC.
- The study provides a framework for optimizing FemNoC experiments for magnon dynamics.
- FemNoC is a powerful technique for probing ultrafast fluctuations in magnetic systems.
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