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Implementation of a Reference Interferometer for Nanodetection
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Published on: April 26, 2014

Self-referenced rectangular path cyclic interferometer with polarization phase shifting.

S Sarkar1, N Ghosh, S Chakraborty

  • 1Department of Electronics and Communication, Techno India, EM4/1, Salt Lake City, Kolkata 700091, India. ssanjukta07@yahoo.co.in

Applied Optics
|January 25, 2012
PubMed
Summary
This summary is machine-generated.

This study presents a novel polarization phase shifting interferometer for measuring transparent sample phase variations. The cyclic path design enables precise phase profile evaluation using polarization techniques.

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Area of Science:

  • Optical Metrology
  • Interferometry
  • Polarization Optics

Background:

  • Phase nonuniformities in transparent samples require precise measurement techniques.
  • Traditional interferometers face challenges in achieving stable phase shifting and reference beam generation.
  • Polarization-based methods offer potential for enhanced interferometric measurements.

Purpose of the Study:

  • To introduce a polarization phase shifting interferometer with a cyclic path configuration.
  • To demonstrate a method for measuring phase nonuniformities in transparent samples.
  • To validate the technique through experimental results.

Main Methods:

  • Utilizing a cube beam splitter and linear polarizers to create counter-propagating, orthogonally polarized beams.
  • Employing a quarter-wave plate to achieve opposite circular polarization for the beams.
  • Implementing phase shifting by rotating a linear polarizer and generating four phase-shifted interferograms.
  • Leveraging the mutually unfolded output beams in a rectangular path configuration to create a reference beam.

Main Results:

  • The proposed cyclic path interferometer successfully measures phase nonuniformities.
  • The polarization phase shifting technique effectively generates phase-shifted interferograms.
  • Experimental results confirm the validity and accuracy of the developed technique.

Conclusions:

  • The polarization phase shifting interferometer with a cyclic path is a viable method for transparent sample analysis.
  • The technique provides a robust approach for evaluating phase profiles.
  • This method offers a promising advancement in optical metrology for material characterization.