標題: Two-dimensional refractive index distribution measurement of a GRIN lens
作者: Hsieh, H. C.
Chen, Y. L.
Wu, W. T.
Chang, W. Y.
Su, D. C.
光電工程學系
Department of Photonics
關鍵字: Circularly polarized light;refractive index;GRIN lens;phase-shifting interferometry;electro-optic modulator
公開日期: 2010
摘要: 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.
URI: http://hdl.handle.net/11536/14605
http://dx.doi.org/10.1117/12.860352
ISBN: 978-0-8194-8287-7
ISSN: 0277-786X
DOI: 10.1117/12.860352
期刊: INTERFEROMETRY XV: APPLICATIONS
Volume: 7791
Appears in Collections:Conferences Paper


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