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Development of electroforming process for soft x-ray ellipsoidal mirror.

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Researchers developed a new nickel electroforming method to create precise soft x-ray ellipsoidal mirrors. This technique achieves nanometer-level accuracy, enabling highly focused soft x-ray beams for advanced applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • X-ray Optics

Background:

  • Soft x-ray focusing requires mirrors with nanometer-level surface accuracy.
  • Direct fabrication of small-diameter, high-accuracy ellipsoidal mirrors is challenging.

Purpose of the Study:

  • To develop and evaluate a novel fabrication process for soft x-ray ellipsoidal mirrors.
  • To assess the shape accuracy of mirrors produced via nickel sulfamate electroforming.

Main Methods:

  • Replication of a high-precision quartz mandrel using nickel sulfamate electroforming.
  • Fabrication of a 40-mm length ellipsoidal mirror.
  • Shape accuracy evaluation using a contact probe measurement method.

Main Results:

  • The fabricated ellipsoidal mirror achieved a replication error RMS of 27.2 nm over the entire surface.
  • Near the mirror's center, the RMS replication error was reduced to 14.7 nm.
  • Wave-optical simulations indicate potential for focusing soft x-rays to a 400 nm spot.

Conclusions:

  • Nickel sulfamate electroforming is a viable method for fabricating high-accuracy soft x-ray ellipsoidal mirrors.
  • The developed process meets the stringent shape requirements for advanced soft x-ray applications.
  • The fabricated mirrors show promise for achieving sub-micron focusing of soft x-rays.