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Population inversion X-ray laser oscillator.

Aliaksei Halavanau1, Andrei Benediktovitch2, Alberto A Lutman3

  • 1Accelerator Research Division, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.

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|June 24, 2020
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Summary
This summary is machine-generated.

Researchers developed a novel X-ray oscillator for generating intense, coherent X-ray pulses. This breakthrough extends X-ray research capabilities beyond current limitations.

Keywords:
X-ray cavityX-ray laseramplified spontaneous emissiontransform-limited pulses

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Area of Science:

  • Physics
  • Materials Science
  • Optics

Background:

  • Optical lasers utilize oscillators for stable, transform-limited pulse generation.
  • Current laser oscillators are limited to infrared, visible, and near-ultraviolet spectral regions.

Purpose of the Study:

  • To investigate the feasibility of X-ray oscillators operating in the 5- to 12-keV photon-energy range.
  • To demonstrate the generation of intense, fully coherent, transform-limited X-ray pulses.

Main Methods:

  • Utilizing the [Formula: see text] line of transition metal compounds as a gain medium.
  • Employing an X-ray free-electron laser as a periodic pump source.
  • Designing a Bragg crystal optical cavity for X-ray oscillation.

Main Results:

  • A copper nitrate gain medium can generate approximately 5 × [Formula: see text] photons per pulse at 8-keV photon energy.
  • Achieved pulse length of 37 fs with 48-meV spectral resolution.
  • Oscillator saturation and full coherence reached in four to six optical-cavity transits due to high gain per pass.

Conclusions:

  • The proposed X-ray oscillator design is feasible and can significantly advance X-ray-based research.
  • The development opens new avenues for exploring materials and phenomena at unprecedented resolution.
  • This work paves the way for extending X-ray research capabilities beyond current limitations.