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Shortening X-Ray Pulse Duration via Saturable Absorption
Ichiro Inoue1, Yuichi Inubushi1,2, Taito Osaka1
1RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan.
Physical Review Letters
|November 1, 2021
Summary
Researchers developed a new nonlinear optical technique to shorten x-ray pulses using core-hole atoms. This method successfully reduced the duration of x-ray free-electron laser pulses by approximately 35%.
Area of Science:
- Atomic physics
- X-ray optics
- Nonlinear optics
Background:
- Shortening x-ray pulse durations is crucial for advanced research.
- Existing methods for manipulating x-ray pulses are limited.
- Nonlinear optical techniques are well-established for optical wavelengths.
Purpose of the Study:
- To present a novel nonlinear optical technique for shortening x-ray pulses.
- To utilize core-hole atoms for manipulating x-ray-matter interactions.
- To extend nonlinear optical technologies to the hard x-ray region.
Main Methods:
- Generation of core-hole atoms via inner-shell photoionization.
- Exploitation of saturable absorption in core-hole atoms.
- Application of the technique to x-ray free-electron laser (XFEL) pulses.
Main Results:
- Demonstrated a nonlinear optical technique using core-hole atoms.
- Achieved a reduction in XFEL pulse duration by approximately 35%.
- Observed decreased absorption above the absorption edge due to weak Coulomb screening.
Conclusions:
- Core-hole atoms are effective for nonlinear x-ray optics.
- This technique is a significant step towards applying nonlinear optics in the hard x-ray regime.
- Enables the development of advanced x-ray pulse manipulation technologies.
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