Two-dimensional angular filtering by volume Bragg gratings in photothermorefractive glass.
Two-dimensional angular filtering by volume Bragg gratings in photothermorefractive glass.
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DOI：
10.1364/ol.36.002167
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发表时间：
2011-06
期刊：
影响因子：
3.6
通讯作者：
Xiang Zhang;Xiao Yuan;S. Wu;Jiansheng Feng;Kuaisheng Zou;Guiju Zhang
中科院分区：
文献类型：
--
作者：
Xiang Zhang;Xiao Yuan;S. Wu;Jiansheng Feng;Kuaisheng Zou;Guiju Zhang
We propose and perform two-dimensional angular filtering on the basis of volume Bragg gratings (VBGs) in a series connection for cleaning up a laser beam. The dependence between angular selectivity and VBG parameters is analyzed with the coupled wave theory. Near-field modulation, contrast ratio, and power spectral density were used to evaluate the effect of filtering in both the spatial and frequency domain. The results from our initial experiments showed that the near-field modulation and contrast ratio of laser beam were remarkably improved.
