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Time delay measurement in the frequency domain.

Stephen M Durbin1, Shih Chieh Liu1, Eric M Dufresne2

  • 1Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA.

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|August 21, 2015
PubMed
Summary

Accurately timing X-ray and laser pulses in pump-probe experiments is crucial for studying ultrafast phenomena. This study presents a novel frequency response method for precise time delay determination, achieving ~1 picosecond resolution.

Keywords:
RF frequency analysisX-ray synchrotronpump–probeultrafast time resolution

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Area of Science:

  • Ultrafast science
  • Synchrotron radiation
  • Spectroscopy

Background:

  • Pump-probe experiments at synchrotrons utilize X-ray and laser pulses to study ultrafast dynamics.
  • Accurate determination of the time delay between these pulses is critical, especially for responses shorter than the X-ray pulse duration (~100 ps).
  • Conventional methods relying on detector time response can be limited by pulse profile dissimilarities and experimental artifacts.

Purpose of the Study:

  • To develop a simple and accurate method for determining the time delay between X-ray and laser pulses in synchrotron-based pump-probe studies.
  • To overcome limitations associated with traditional time-response-based timing techniques.

Main Methods:

  • Monitoring the frequency response of a detector sensitive to both X-ray and laser pulses as a function of time delay.
  • Utilizing the frequency domain to infer the temporal overlap and delay between the pulses.

Main Results:

  • The proposed frequency response method readily achieved a time resolution of approximately 1 picosecond (ps).
  • The precision of the time delay determination can be enhanced by extending the data acquisition time.

Conclusions:

  • The frequency response monitoring technique offers a robust and simple alternative for precise time delay determination in pump-probe experiments.
  • This method is particularly valuable for synchronizing ultrafast X-ray and laser pulses, enabling detailed studies of rapid dynamic processes.