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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Published on: October 23, 2018

X-ray lasers from Inner-shell transitions pumped by the Free-electron laser.

J Zhao1, Q L Dong, S J Wang

  • 1Beijing National laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.

Optics Express
|June 11, 2008
PubMed
Summary
This summary is machine-generated.

We demonstrate generating femtosecond coherent X-ray pulses using self-amplified free-electron lasers (SASE FEL) to pump inner-shell X-ray lasers (ISXRLs). This method smooths chaotic pulses and can produce ultra-short 2fs pulses with narrower bandwidths.

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Area of Science:

  • * Physics
  • * X-ray Science
  • * Laser Technology

Background:

  • * Self-amplified free-electron lasers (SASE FELs) produce powerful but temporally complex X-ray pulses.
  • * Inner-shell X-ray lasers (ISXRLs) offer potential for generating coherent X-ray radiation.
  • * Developing methods to control and improve the temporal properties of X-ray pulses is crucial for advanced applications.

Purpose of the Study:

  • * To investigate a novel approach for generating femtosecond coherent X-ray pulses.
  • * To utilize SASE FELs as pump sources for ISXRLs.
  • * To analyze the gain characteristics and output properties of ISXRLs in different atomic systems.

Main Methods:

  • * Theoretical simulations of ISXRL schemes.
  • * Analysis of gain characteristics for carbon (1s⁻¹ → 2p⁻¹) and calcium (2p⁻¹ → 3s⁻¹) transitions.
  • * One-dimensional modeling of output ISXRL properties.

Main Results:

  • * Predicted net gain of 140 cm⁻¹ for ISXRLs pumped by SASE FELs.
  • * Carbon ISXRL scheme smoothed chaotic SASE FEL pulses into temporally continuous ones.
  • * Calcium ISXRL scheme generated ultra-short pulses with a duration of 2 fs.
  • * Output ISXRLs exhibited a spectral bandwidth one order narrower than SASE FELs.

Conclusions:

  • * SASE FEL-pumped ISXRLs provide a viable route to generate high-quality femtosecond coherent X-ray pulses.
  • * The proposed method enables temporal smoothing of SASE FEL radiation and generation of ultra-short X-ray laser pulses.
  • * This technique offers enhanced control over X-ray pulse properties, advancing coherent X-ray science.