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Measurement of the group refractive index of bulk material using white-light spectral interferometry

Zhang Shu-Na Luo Zhen-Yue Shen Wei-Dong Liu Xu Zhang Yue-Guang

Measurement of the group refractive index of bulk material using white-light spectral interferometry

Zhang Shu-Na, Luo Zhen-Yue, Shen Wei-Dong, Liu Xu, Zhang Yue-Guang
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  • PDF Downloads:  1155
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Publishing process
  • Received Date:  02 November 2009
  • Accepted Date:  03 May 2010
  • Published Online:  15 January 2011

Measurement of the group refractive index of bulk material using white-light spectral interferometry

  • 1. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China

Abstract: It is a radical but pressing problem to measure the group refractive index of dispersive material both accurately and rapidly in optical engineering field. In this paper, a white-light spectral interferometric system employing a fiber-optic spectrometer is developed for solving this problem. The system takes advantage of the characteristic of fiber-optic spectrometer which can get all the interferometric information by a single shot image without any mechanical scanning. Compared with the traditional windowed Fourier transform, a wavelet transform algorithm is used to directly extract the group delay rather than the phase from the interferogram. Therefore, the new method can provide a simple and fast solution, while still maintaining high accuracy. Based on this white-light Michelson interferometric system, fused silica and BK7 glass samples are measured respectively and the results agree well with the theoretical values over a broad spectral range. At the end of this paper, different mirror positions are used to verify the repeatability of our method.

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