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Related Experiment Videos

Optical design for laser Doppler angular encoder with sub-nrad sensitivity.

D Shu1, E E Alp, J Barraza

  • 1Experimental Facilities Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary

A new laser angular encoder system achieves sub-nanoradian resolution, offering 10-20x higher precision than existing laser Doppler displacement meters for advanced photon source applications.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Instrumentation

Background:

  • High-resolution angular measurement is critical for advanced scientific instrumentation.
  • Existing laser Doppler displacement meters and laser interferometer systems have limitations in resolution and compactness.
  • Applications at facilities like the Advanced Photon Source require enhanced precision angular encoders.

Purpose of the Study:

  • To develop a novel laser angular encoder system with significantly improved resolution.
  • To integrate principles of radar, Doppler effect, and optical heterodyning for enhanced performance.
  • To create a compact system suitable for demanding experimental environments.

Main Methods:

  • Development of a novel laser angular-encoder system.

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  • Utilizing principles of radar, Doppler effect, and optical heterodyning.
  • Implementation of a self-aligning, three-dimensional multiple-reflection optical path.

    • Main Results:

    • Achieved sub-nanoradian resolution within an 8-degree measuring range.
    • Demonstrated a 10 to 20 times increase in resolution compared to commercial systems.
    • Developed a compact setup (approx. 60x150x370 mm).

    Conclusions:

    • The novel laser angular encoder system offers unprecedented resolution and compactness.
    • This technology is well-suited for high-energy-resolution applications, such as at the Advanced Photon Source.
    • The system represents a significant advancement in angular metrology.