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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 24 — Aug. 20, 2009
  • pp: 4756–4761

Simultaneous measurement of refractive index and wedge angle of optical windows using Fizeau interferometry and a cyclic path optical configuration

Y. Pavan Kumar and Sanjib Chatterjee  »View Author Affiliations

Applied Optics, Vol. 48, Issue 24, pp. 4756-4761 (2009)

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We present a new technique for the simultaneous measurement of refractive index and wedge angle of optical windows using Fizeau interferometry and a cyclic path optical configuration (CPOC). Two laterally separated beams are obtained from an expanded collimated beam using an aperture containing two rectangular openings. The test wedge plate is placed in one of the two separated beams. Using CPOC, these two beams are made to overlap and interfere, producing interference fringes in the overlapping region. The beams reflected from the front and back surfaces of the test wedge plate interfere and produce Fizeau fringes. The refractive index is related to the spacing of the above two beam fringes. The wedge angle is determined from the evaluated values of the refractive index and Fizeau fringe spacing. The results obtained for a BK-7 optical window are presented.

© 2009 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(260.3160) Physical optics : Interference

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 31, 2009
Revised Manuscript: June 5, 2009
Manuscript Accepted: July 28, 2009
Published: August 13, 2009

Y. Pavan Kumar and Sanjib Chatterjee, "Simultaneous measurement of refractive index and wedge angle of optical windows using Fizeau interferometry and a cyclic path optical configuration," Appl. Opt. 48, 4756-4761 (2009)

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