Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Opt Lett. 2011 Jun 1;36(11):2167-9. doi: 10.1364/OL.36.002167.
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.
我们提出并在串联的体积布拉格光栅（VBG）上进行二维角度滤波，以清理激光束。利用耦合波理论分析了角度选择性与 VBG 参数之间的关系。近场调制、对比度和功率谱密度被用于评估在空间和频率域中滤波的效果。我们的初步实验结果表明，激光束的近场调制和对比度得到了显著提高。
