Nonbulk motion system for simultaneously measuring the refractive index and thickness of a sample using tunable optics and spatial signal processing-based Gaussian beam imaging

Applied Optics
Syed Azer Reza, Muhammad Qasim

Abstract

This paper presents a novel approach to simultaneously measuring the thickness and refractive index of a sample. The design uses an electronically controlled tunable lens (ECTL) and a microelectromechanical-system-based digital micromirror device (DMD). The method achieves the desired results by using the DMD to characterize the spatial profile of a Gaussian laser beam at different focal length settings of the ECTL. The ECTL achieves tunable lensing through minimal motion of liquid inside a transparent casing, whereas the DMD contains an array of movable micromirrors, which make it a reflective spatial light modulator. As the proposed system uses an ECTL, a DMD, and other fixed optical components, it measures the thickness and refractive index without requiring any motion of bulk components such as translational and rotational stages. A motion-free system improves measurement repeatability and reliability. Moreover, the measurement of sample thickness and refractive index can be completely automated because the ECTL and DMD are controlled through digital signals. We develop and discuss the theory in detail to explain the measurement methodology of the proposed system and present results from experiments performed to verify the ...Continue Reading

References

Nov 22, 1991·Science·D HuangC A Puliafito
Jun 25, 2002·Applied Optics·Sarun Sumriddetchkajorn, Nabeel A Riza
Sep 21, 2006·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Denis PristinskiSvetlana A Sukhishvili
Oct 1, 1966·Applied Optics·H Kogelnik, T Li
May 1, 1968·Applied Optics·A J Werner

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Citations

Jan 14, 2017·Applied Optics·Syed Azer Reza, Arslan Anjum

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