25 February 2014 Near field angular filtering with volume Bragg gratings in photothermorefractive glass
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Abstract
Angular filtering with volume Bragg gratings in photothermorefractive glass was described. The coupled-wave theory was used to discuss the angular filtering based on Transmission Volume Bragg Gratings (TBGs). The results showed that the cutoff frequency was improved, the refractive index modulation had a greater impact on the output beam and the deviation from Bragg condition for incident beam should be less than 0.1mrad. The influence on output beam quality with TBGs parameters was analyzed. Experimental results showed that the near-field distribution of output beam through the angular filtering is better than that of the incident laser beam, and the low-frequency loss of near-field angular filtering is less than 1.8%.
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Xiang Zhang, Xiang Zhang, Fan Gao, Fan Gao, Jiansheng Feng, Jiansheng Feng, Kuaisheng Zou, Kuaisheng Zou, Xiao Yuan, Xiao Yuan, } "Near field angular filtering with volume Bragg gratings in photothermorefractive glass", Proc. SPIE 8962, High Energy/Average Power Lasers and Intense Beam Applications VII, 89620L (25 February 2014); doi: 10.1117/12.2040109; https://doi.org/10.1117/12.2040109
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