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Shearing interferometers for testing corner cubes and right angle prisms.

D Sen1, P N Puntambekar

  • 1National Physical Laboratory, NewDelhi, India.

Applied Optics
|January 6, 2010
PubMed
Summary
This summary is machine-generated.

Two new interferometers offer stable and simple testing for corner cubes and right-angle prisms. These optical testing tools measure wavefront divergence and can detect symmetrical errors with adjustments.

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Area of Science:

  • Optical Engineering
  • Metrology

Background:

  • Accurate testing of optical components like corner cubes and right-angle prisms is crucial for precision optical systems.
  • Existing interferometric methods may lack simplicity or direct measurement of certain prism errors.

Purpose of the Study:

  • To introduce two novel interferometers: a wavefront reversing interferometer and an inverting interferometer.
  • To provide stable, easy-to-adjust, and simply set-up methods for testing prisms.
  • To enable measurement of reflected wavefront divergence and symmetrical prism errors.

Main Methods:

  • Development and description of a wavefront reversing interferometer.
  • Development and description of an inverting interferometer.
  • Utilizing shear variation in the inverting interferometer to determine symmetrical errors.

Main Results:

  • Both interferometers are stable, easy to adjust, and require simple setups.
  • They possess adequate sensitivity for measuring reflected wavefront divergence.
  • The inverting interferometer, by changing shear, can determine symmetrical prism errors.

Conclusions:

  • The described interferometers provide effective means for testing corner cubes and right-angle prisms.
  • Suggested methods facilitate in-process testing and defect correction during prism manufacturing.
  • These tools enhance the quality control and production efficiency of optical prisms.