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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 16 — Jun. 1, 2013
  • pp: 3655–3661

Refractive index measurement by fiber point diffraction longitudinal shearing interferometry

Lingfeng Chen, Xiaofei Guo, and Jinjian Hao  »View Author Affiliations

Applied Optics, Vol. 52, Issue 16, pp. 3655-3661 (2013)

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A refractive index measurement method by measuring the longitudinal displacement of a point light source (PLS) after passing through a plane-parallel-plate sample is proposed. The displacement is derived by applying two point-diffraction longitudinal shearing interferometric measurements if the distance from the PLS to the exit pupil is predetermined. With two fibers to simulate the ideal PLS, an experimental system for solid and liquid sample tests is proposed to verify the principle. The experimental results indicate that its accuracy is in the order of 104. Ways to improve the accuracy are discussed based on the detailed error analysis.

© 2013 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(120.4630) Instrumentation, measurement, and metrology : Optical inspection

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 28, 2013
Revised Manuscript: April 7, 2013
Manuscript Accepted: April 15, 2013
Published: May 22, 2013

Lingfeng Chen, Xiaofei Guo, and Jinjian Hao, "Refractive index measurement by fiber point diffraction longitudinal shearing interferometry," Appl. Opt. 52, 3655-3661 (2013)

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