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On automatic parallelism control in a scanning Fabry-Perot interferometer.

C F Bruce1

  • 1Division of Applied Physics, National Standards Laboratory, CSIRO, Sydney, Australia.

Applied Optics
|January 9, 2010
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Summary
This summary is machine-generated.

This study presents a novel method for maintaining optical plate parallelism in scanning Fabry-Perot interferometers. The technique achieves high precision control, crucial for advanced optical measurements.

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Area of Science:

  • Optical Physics
  • Interferometry
  • Precision Metrology

Background:

  • Maintaining optical plate parallelism is critical for Fabry-Perot interferometer performance.
  • Existing methods may require complex instrumentation or lack precision.

Purpose of the Study:

  • To describe a new method for precise control of optical plate parallelism in scanning Fabry-Perot interferometers.
  • To demonstrate the effectiveness of the method with experimental validation.

Main Methods:

  • Applying small, orthogonal oscillatory rotational movements to one interferometer plate.
  • Simultaneously moving the other plate axially in an oscillatory fashion.
  • Utilizing a single photodetector to analyze frequency components of the transmitted light signal for feedback control.

Main Results:

  • Achieved plate parallelism control better than 10⁻⁸ radians for path differences up to 200 mm using mercury 198 green line.
  • Approached 10⁻⁹ radians accuracy for path differences up to 100 mm.
  • The method requires minimal additional instrumentation beyond standard detection equipment.

Conclusions:

  • The described method offers a precise and efficient way to control Fabry-Perot interferometer plate parallelism.
  • The technique is adaptable for long path differences, particularly with laser light sources.
  • Environmental factors like vibration and medium stability are key limitations for ultimate accuracy.