Measurements of material refractive index with a circular heterodyne interferometer

Zhi Cheng Jian; Jiun You Lin; Po Jen Hsieh; Der Chin Su

doi:10.1117/12.612480

Measurements of material refractive index with a circular heterodyne interferometer

Zhi Cheng Jian, Jiun You Lin, Po Jen Hsieh, Der Chin Su

Department of Mechatronic Engineering

Research output: Contribution to journal › Conference article

1 Citation (Scopus)

Abstract

When a light coming from a circularly polarized heterodyne light source incidents on an optical material, a phase difference between s- and p- polarization components of the reflected light occurs. This phase difference can be measured accurately with the heterodyne interferometry. The measured data are substituted into the special equations derived from Fresnel equations, the refractive index can be estimated. This method bears both merits of a common-path interferometer and a heterodyne interferometer. The refractive indices of three optical glasses and two birefringent crystals were measured to show the validity of this method.

Original language	English
Article number	74
Pages (from-to)	882-892
Number of pages	11
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	5856 PART II
DOIs	https://doi.org/10.1117/12.612480
Publication status	Published - 2005 Dec 19
Event	Optical Measurement Systems for Industrial Inspection IV - Munich, Germany Duration: 2005 Jun 13 → 2005 Jun 17

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All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Cite this

Jian, Z. C., Lin, J. Y., Hsieh, P. J., & Su, D. C. (2005). Measurements of material refractive index with a circular heterodyne interferometer. Proceedings of SPIE - The International Society for Optical Engineering, 5856 PART II, 882-892. [74]. https://doi.org/10.1117/12.612480

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AB - When a light coming from a circularly polarized heterodyne light source incidents on an optical material, a phase difference between s- and p- polarization components of the reflected light occurs. This phase difference can be measured accurately with the heterodyne interferometry. The measured data are substituted into the special equations derived from Fresnel equations, the refractive index can be estimated. This method bears both merits of a common-path interferometer and a heterodyne interferometer. The refractive indices of three optical glasses and two birefringent crystals were measured to show the validity of this method.

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10.1117/12.612480