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Implementation of a Reference Interferometer for Nanodetection
16:11

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Published on: April 26, 2014

A heterodyne interferometer for angle metrology.

Inseob Hahn1, M Weilert, X Wang

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.

The Review of Scientific Instruments
|May 6, 2010
PubMed
Summary
This summary is machine-generated.

We developed a compact heterodyne interferometer for precise angle measurements. This instrument achieves 0.1 nrad/√Hz angle noise, ideal for tracking telescope systems.

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Area of Science:

  • Optical Metrology
  • Precision Engineering

Background:

  • Accurate angle measurement is crucial for high-precision systems like tracking telescopes.
  • Existing methods may lack the required resolution or compactness.

Purpose of the Study:

  • To develop a compact, high-resolution angle measurement instrument.
  • To enable simultaneous pitch and yaw angle determination.

Main Methods:

  • Utilized a common-path heterodyne interferometer.
  • Employed an optical mask to sample laser beams from four target surface areas.
  • Calculated angular rotations from relative displacement measurements.

Main Results:

  • Achieved angle noise of 0.1 nrad/√Hz at 1 Hz (1 m working distance).
  • Demonstrated an operational range of +/-0.15 mrad with nonlinearity of 3 µrad rms for flat mirrors.
  • Successfully applied to a tracking telescope testbed for mirror angle measurements.

Conclusions:

  • The developed heterodyne interferometer offers a compact and high-resolution solution for angle measurement.
  • The instrument is suitable for demanding applications such as tracking telescope systems.
  • The metrology approach provides simultaneous two-axis angle determination with excellent noise performance.