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Related Experiment Video

Updated: May 30, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Linear diffraction grating interferometer with high alignment tolerance and high accuracy.

Fang Cheng1, Kuang-Chao Fan

  • 1School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore.

Applied Optics
|August 12, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel diffraction grating interferometer for precise, long-stroke displacement sensing. The innovative design achieves nanometer resolution, enhancing linear stage measurement accuracy.

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Mechanical Engineering

Background:

  • Accurate displacement sensing is crucial for precision engineering.
  • Existing interferometers often face challenges with alignment tolerance and environmental stability.
  • The need for robust, high-resolution sensors for linear stages persists.

Purpose of the Study:

  • To develop an innovative linear diffraction grating interferometer.
  • To achieve long stroke capability with nanometer resolution for linear stages.
  • To enhance alignment tolerance and structural compactness.

Main Methods:

  • Utilizing phase information from ±1st order diffracted beams of a holographic grating.
  • Implementing a self-compensating structure for improved alignment tolerance.
  • Employing optical bonding technology for compact sensor design.
  • Developing software for real-time signal processing (pulse counting and phase subdivision).

Main Results:

  • LightTool analysis confirmed immunity to offset, yaw, and roll alignment errors.
  • The structure demonstrated acceptable pitch tolerance for most installations.
  • Optical bonding enabled a compact design with improved signal quality.
  • Experimental tests showed a repeatability within 15 nm over a 15 mm travel length.

Conclusions:

  • The developed diffraction grating interferometer offers a robust solution for high-resolution displacement sensing.
  • The self-compensation and optical bonding technologies significantly improve sensor performance and practicality.
  • This innovation is suitable for various linear stage applications requiring precise motion control.