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X-ray laser beam with diffraction-limited divergence generated with two gain media.

Momoko Tanaka1, Masaharu Nishikino, Tetsuya Kawachi

  • 1Japan Atomic Energy Research Institute, 8-1-1-2, Umemidai, Kizu-cho, Souraku-gun, Kyoto, 619-0215, Japan.

Optics Letters
|September 19, 2003
PubMed
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Researchers developed a novel x-ray laser at 13.9 nm. This advanced laser system utilizes two gain media and controlled seed injection to minimize refraction, achieving near-diffraction-limited performance.

Area of Science:

  • Physics
  • Optics
  • Laser Technology

Background:

  • X-ray lasers are crucial tools for various scientific applications, but achieving high beam quality remains a challenge.
  • Refraction effects can degrade the performance and coherence of x-ray beams during propagation.

Purpose of the Study:

  • To demonstrate a high-quality x-ray laser at a specific wavelength (13.9 nm).
  • To investigate methods for improving x-ray beam quality by mitigating refractive effects.

Main Methods:

  • Generation of an x-ray laser using two cascaded gain media.
  • Amplification of a seed x-ray pulse from the first gain medium in the second.
  • Spatially and temporally controlled injection of the seed x-ray pulse into the second gain medium to reduce refraction.

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Main Results:

  • Successful demonstration of an x-ray laser operating at a wavelength of 13.9 nm.
  • Achieved a beam divergence of 0.2 mrad, which is 1.8 times the diffraction limit.
  • Observed reduction in the detrimental effects of refraction on x-ray propagation.

Conclusions:

  • The developed two-stage gain medium approach with controlled seed injection effectively produces high-quality x-ray laser beams.
  • This method offers a promising pathway for generating coherent x-ray radiation with reduced aberrations for advanced applications.