Two-dimensional refractive index distribution measurement of a GRIN lens

H. C. Hsieh; Y. L. Chen; W. T. Wu; W. Y. Chang; D. C. Su

doi:10.1117/12.860352

2 August 2010 Two-dimensional refractive index distribution measurement of a GRIN lens

H. C. Hsieh, Y. L. Chen, W. T. Wu, W. Y. Chang, D. C. Su

Proceedings Volume 7791, Interferometry XV: Applications; 77910A (2010) https://doi.org/10.1117/12.860352
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

Based on the Fresnel's equations and the phase-shifting method, an alternative method for measuring the refractive index distribution of a GRIN lens is presented. A linearly/circularly polarized light in order enters a modified Twyman-Green interferometer, in which an electro-optical modulator is used as a phase shifter. In the interferometer, the light beam is divided by a beam-splitter into two beams, a reference beam and a test beam. After they are reflected by a plane mirror and the tested GRIN lens, respectively, they are combined together and pass through an analyzer. The analyzer extracts the same polarized components to interfere each other, and the full-field interference signals produced by the components of the s- and the p-polarizations can be obtained. The full-field interference signals are taken by a CMOS camera. The phase differences can be obtained by using the four-step phase-shifting interferometric method. Substituting these two groups of data into special equations derived from Fresnel equations, and the two-dimensional refractive index distribution of the GRIN lens can be calculated. Its validity is demonstrated and has some merits such as simple optical configuration, easy operation and high resolution.

Citation Download Citation

H. C. Hsieh, Y. L. Chen, W. T. Wu, W. Y. Chang, and D. C. Su "Two-dimensional refractive index distribution measurement of a GRIN lens", Proc. SPIE 7791, Interferometry XV: Applications, 77910A (2 August 2010); https://doi.org/10.1117/12.860352

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available