Chinese Optics Letters, Volume. 14, Issue 6, 060502(2016)
Sidelobes suppression in angular filtering with volume Bragg gratings combination
Figures & Tables(10)
Fig. 1. Angular selectivities of the VBGs with different (a) grating periods and (b) thicknesses.
Fig. 2. Angular selectivities of the single VBG and combined VBGs with different (a) periods and (b) thicknesses.
Fig. 3. Schematic diagram of the angular selectivity with two combined VBGs.
Fig. 4. Near-field beam profile of the diffracted beams through (a) a single VBG-I and (b) the combined VBGs.
Fig. 5. Schematic diagram of the non-sidelobe angular filter with the combined VBGs.
Fig. 6. Near-field distribution of the (a) modulated beam, (b) diffracted beams through single VBG-I, and (c) through combined VBGs.
Fig. 7. Far-field distribution of (a) modulated beam, (b) diffracted beams through the single VBG-I, and (c) through the combined VBGs.
Fig. 8. Dependence of the PSD with spatial frequency for (a) original beam, (b) modulated beam, (c) filtered beam through the angular filter based on the single VBG-I, and (d) filtered beam through the non-sidelobe angular filter.
Table 1. Parameters of the VBGs Used in the Experiment
View tableView in ArticleTable 1. Parameters of the VBGs Used in the Experiment
Period Thickness Refractive Index Modulation Diffraction Efficiency VBG-I 0.96 μm 2.9 mm 70–100 ppm 85% VBG-II 2.5 mm
Table 2. Results of M and C
View tableView in ArticleTable 2. Results of M and C
Shaped Beam Modulated Beam Single VBG Combined VBGs M 1.04 2.54 1.25 1.07 C 2.8% 83.7% 7.3% 4.4%
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Fan Gao, Xiao Yuan, Xiang Zhang, "Sidelobes suppression in angular filtering with volume Bragg gratings combination," Chin. Opt. Lett. 14, 060502 (2016)
Paper Information
Category: Diffraction and Gratings
Received: Feb. 3, 2016
Accepted: Apr. 8, 2016
Published Online: Aug. 3, 2018
The Author Email: Xiang Zhang (zxiang@suda.edu.cn)
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