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A cross-correlator-based timing tool for FemtoMAX.

D Kroon1, E Nilsson2, B Ahn1

  • 1MAX IV Laboratory, Lund University, PO Box 118, SE-221 00 Lund, Sweden.

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|June 2, 2025
PubMed
Summary
This summary is machine-generated.

We developed an ultrafast timing diagnostic using sum-frequency generation to precisely measure the time delay between synchronized X-ray pulses and laser pulses, achieving sub-30 fs accuracy.

Keywords:
femtosecond lasersynchronizationtime-resolved pump/probe experimentstiming jitter monitortiming tool

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Area of Science:

  • Physics
  • Optics
  • Materials Science

Background:

  • Synchronizing ultrashort light pulses is crucial for pump/probe experiments.
  • Existing methods for timing diagnostics have limitations in accuracy and scope.

Purpose of the Study:

  • To commission a novel ultrafast timing diagnostic system.
  • To enable online monitoring of the relative timing between hard X-ray pulses and synchronized visible laser pulses.

Main Methods:

  • Utilized sum-frequency generation in a nonlinear crystal.
  • Employed a setup analogous to auto/cross-correlators.
  • Combined a weak visible diagnostic beam from FemtoMAX with an intense synchronized laser beam.

Main Results:

  • Achieved sub-30 femtosecond (fs) timing accuracy for pulses <50 fs (FWHM).
  • Demonstrated the capability to measure time offsets within a 4 picosecond (ps) interval.
  • Successfully enabled online monitoring of X-ray source and laser synchronization.

Conclusions:

  • The developed diagnostic offers high accuracy for synchronizing X-ray and laser pulses.
  • The method is suitable for online monitoring in pump/probe experiments.
  • The system's advantages and limitations were discussed for future applications.