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Pump-probe experimental methodology at the Linac Coherent Light Source.

James M Glownia1, Karl Gumerlock1, Henrik T Lemke2

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Journal of Synchrotron Radiation
|May 11, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed new methods for femtosecond pump-probe experiments using free-electron lasers (FELs). These techniques improve timing accuracy and correct for fluctuations in FEL light, crucial for advanced X-ray science.

Keywords:
X-ray free-electron lasersXFELspump–probe experimentsultrafast lasers

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Area of Science:

  • Ultrafast spectroscopy
  • X-ray science
  • Laser physics

Background:

  • Pump-probe experiments utilize ultrafast laser pulses to study dynamic processes.
  • Free-electron lasers (FELs) provide high-intensity, short X-ray pulses essential for advanced experiments.
  • Challenges include precise temporal overlap and managing FEL pulse variations.

Purpose of the Study:

  • To present an overview of techniques for pump-probe experiments at the Linac Coherent Light Source (LCLS).
  • To address challenges in femtosecond timing and FEL pulse stability.
  • To enhance the reliability and accuracy of ultrafast X-ray experiments.

Main Methods:

  • Utilizing short X-ray pulses from free-electron lasers (FELs) below 10 fs.
  • Employing traditional optical lasers for pump-probe setups.
  • Developing and implementing novel methods for temporal overlap determination and monitoring at the femtosecond scale.
  • Implementing strategies to correct for pulse-to-pulse fluctuations in FEL light.

Main Results:

  • Established robust methods for achieving femtosecond temporal overlap between X-ray and optical pulses.
  • Developed techniques to monitor and scan experimental timing with high precision.
  • Implemented corrections for self-amplified spontaneous emission (SASE) related FEL beam property fluctuations.
  • Improved the overall reliability of pump-probe experiments at LCLS.

Conclusions:

  • The developed techniques significantly enhance the capability to perform high-resolution pump-probe experiments at FEL facilities.
  • Accurate timing and stability correction are critical for advancing ultrafast X-ray science.
  • These methods provide a foundation for future investigations into dynamic processes at the femtosecond timescale.