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Partially coherent ultrafast spectrography.

C Bourassin-Bouchet1, M-E Couprie2

  • 11] Synchrotron SOLEIL, Saint Aubin, BP 34, 91 192 Gif-sur-Yvette, France [2] Laboratoire Charles Fabry, UMR 8501, Institut d'Optique, CNRS, Univ Paris Sud 11, 2, Avenue Augustin Fresnel, 91127 Palaiseau Cedex, France.

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Summary
This summary is machine-generated.

This study adapts frequency-resolved optical gating (FROG) to measure partially coherent ultrashort pulses, crucial for emerging X-ray sources. The method requires no experimental changes, only altered data processing for attosecond temporal metrology.

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Area of Science:

  • Ultrafast science
  • Quantum optics
  • X-ray metrology

Background:

  • Modern ultrafast metrology assumes fully coherent light pulses, described by spectrum and spectral phase.
  • Synthesizing fully coherent pulses is challenging, particularly for emerging ultrashort X-ray sources.
  • Temporal metrology is essential for characterizing these advanced X-ray sources.

Purpose of the Study:

  • To adapt frequency-resolved optical gating (FROG) for measuring partially coherent ultrashort pulses.
  • To enable attosecond timescale temporal metrology for challenging light sources.
  • To provide a practical method for characterizing pulses from emerging X-ray technologies.

Main Methods:

  • Adapted the data processing of frequency-resolved optical gating (FROG).
  • Applied principles from quantum optics and coherent diffractive imaging to handle partial coherence.
  • No modifications to existing experimental setups were necessary.

Main Results:

  • Demonstrated the adaptation of FROG for measuring partially coherent pulses.
  • Achieved temporal metrology down to the attosecond timescale for such pulses.
  • Validated a new processing approach for FROG measurements.

Conclusions:

  • Frequency-resolved optical gating (FROG) can be effectively utilized for partially coherent ultrashort pulses.
  • This adaptation is vital for advancing metrology in fields like attosecond science and X-ray free-electron lasers.
  • The technique offers immediate applications, including pulse characterization despite timing jitter in X-ray free-electron laser (XFEL) systems.