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Area of Science:

  • Condensed Matter Physics
  • X-ray Optics
  • Materials Science

Background:

  • Dynamical diffraction in thin crystals generates highly monochromatic X-ray beams with femtosecond time delays, known as echoes.
  • These echoes are utilized in X-Ray Free Electron Lasers (XFELs) for self-seeding to enhance beam monochromaticity.

Purpose of the Study:

  • To perform coherent X-ray imaging of echoes from silicon crystals.
  • To investigate the influence of surface strain on the temporal delay of these echoes.
  • To explore the potential for strain tailoring X-ray optics and studying material strain using ultrafast diffraction.

Main Methods:

  • Coherent X-ray imaging techniques were employed to measure the echoes.
  • Silicon (Si) crystals were used as the sample material.
  • Surface strain was intentionally introduced and varied to observe its effect on echo temporal delay.

Main Results:

  • Coherent X-ray imaging successfully measured echoes from Si crystals.
  • A direct correlation was established between small surface strain and the tunability of echo temporal delay.
  • The study demonstrated that surface strain can precisely control the timing of the X-ray echoes.

Conclusions:

  • Surface strain offers a method to tune the temporal delay of ultrafast diffraction echoes.
  • This finding is a significant step towards developing strain-engineered X-ray optics.
  • Ultrafast dynamical diffraction effects can be leveraged for advanced material strain analysis.