频域低相干光干涉的折射率三维重建系统

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Abstract

Optical refractive index (ORI) is one of the most important physical parameters for the description of the characterization of optical material, and measurement of ORI is crucial for research and industrial applications. We demonstrate establish an experimental system for three-dimensional imaging of ORI by combining low-coherence interferometry in frequency domain and computed tomography. The experimental system mainly consists of a broadband light source, an optical fiber Michelson interferometer and a spectrometer. The interference spectra of the detection light and reference light are acquired with the spectrometer, and the parallel projection of optical refractive index is calculated from the acquired interference spectra by Fourier transformation. The three-dimensional distribution of refractive index is reconstructed by the filtered back-projection algorithm. We experimentally demonstrate this system by cross-sectional imaging of a plastic tube. The present system is suitable for three-dimensional imaging of samples with homogeneous and inhomogeneous ORI distributions, and the ORI sensitivity is 0.01. The imaging system is suitable to be used as a synthetic and designing experiment in physical experiment teaching for undergraduates.

Key words： optical refractive index three-dimensional imaging low-coherence interferometry filtered back-projection algorithm

Received: 08 June 2016 Published: 10 July 2017

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	Articles by authors
	Hongxian ZHOU
	Luying ZHANG
	Yi WANG

Cite this article:

Hongxian ZHOU,Luying ZHANG,Yi WANG. Three-dimensional Imaging of Optical Refractive Index by Low-coherence Interferometry in Fourier Frequency Domain[J]. Research and Exploration in Laboratory, 2017, 36(5): 61-63.

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http://www.qk.sjtu.edu.cn/rel/EN/ OR http://www.qk.sjtu.edu.cn/rel/EN/Y2017/V36/I5/61

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