%0 Journal Article
%T Measurement of the group refractive index of bulk material using white-light spectral interferometry<br>利用白光干涉技术测量块状材料的群折射率
%A Zhang Shu-Na
%A Luo Zhen-Yue
%A Shen Wei-Dong
%A Liu Xu
%A Zhang Yue-Guang
%A <br>张淑娜
%A 罗震岳
%A 沈伟东
%A 刘旭
%A 章岳光
%J 物理学报
%D 2011
%I 
%X 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.
%K white-light interferometry
%K group refractive index
%K wavelet transform
%K Fourier transform<br>白光干涉
%K 群折射率
%K 小波变换
%K 傅里叶变换
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=DFBF20F0D72496F8F0A9F710CAC953FD&yid=9377ED8094509821&vid=BFE7933E5EEA150D&iid=CA4FD0336C81A37A&sid=82C01D2711955293&eid=82C01D2711955293&journal_id=1000-3290&journal_name=物理学报&referenced_num=1&reference_num=20