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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 20 — Jul. 10, 2013
  • pp: 4820–4826

Determination of the index inhomogeneity of transparent isotropic optical material with a dual Sagnac interferometer

Sanjib Chatterjee and Y. Pavan Kumar  »View Author Affiliations

Applied Optics, Vol. 52, Issue 20, pp. 4820-4826 (2013)

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A technique for the measurement of inhomogeneity of optical glass, fused silica, etc., using a Sagnac interferometer (SI) has been presented. An SI produces a pair of laterally separated, mutually parallel, collimated beams with orthogonal planes of polarization, i.e., p and s polarizations from an expanded, linearly polarized (45°) collimated He–Ne (632.8 nm) input laser beam. The p and s beams pass through a liquid-filled cell with plane parallel glass windows. The test glass with plane parallel end surfaces is kept in the path of the p beam in the index matching liquid, while the s beam traverses a parallel path through the liquid. Another SI recombines the emergent p and s beams by removing the lateral shear. A quarter-wave plate transforms the state of polarization of the beams to opposite circular polarizations of which the components selected by a linear polarizer interfere to form Fizeau fringes. Polarization phase shifting interferometery has been applied to determine the optical path difference (OPD) variations. The OPD variation without the test glass is subtracted from that with test glass to eliminate the effect of system aberration. The results for a phosphate laser glass sample have been presented.

© 2013 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(160.2750) Materials : Glass and other amorphous materials

ToC Category:

Original Manuscript: March 21, 2013
Revised Manuscript: June 5, 2013
Manuscript Accepted: June 5, 2013
Published: July 3, 2013

Sanjib Chatterjee and Y. Pavan Kumar, "Determination of the index inhomogeneity of transparent isotropic optical material with a dual Sagnac interferometer," Appl. Opt. 52, 4820-4826 (2013)

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