Fan Gao, Xin Wang, Tiancheng Yu, Xiang Zhang, Xiao Yuan. Band-stop angular filtering with hump volume Bragg gratings[J]. High Power Laser Science and Engineering, 2019, 7(2): 02000e29
- High Power Laser Science and Engineering
- Vol. 7, Issue 2, 02000e29 (2019)
Fig. 1. (a) Dependence of the central diffraction efficiency of the VBG on the product of the refractive index modulation and grating thickness; (b) angular selectivity of the VBG and HVBG.
Fig. 2. Principle of the BSF based on HVBGs.
Fig. 3. Diagram of band-stop filtering in a two-stage amplifier system.
Fig. 4. Angular selectivity of the HVBGs used in the simulation.
Fig. 5. Near-field beam profiles of (a) the incident beam, (b) output beam from Amp.1, and output beams from the two-stage amplifier system (c) without BSF and (d) with BSF.
Fig. 6. The dependence of near-field modulation on the accumulated B integral.
Fig. 7. Dependence of the normalized PSD on the spatial frequency both in (a) the $x$ direction and (b) the $y$ direction for the incident beam, the output beam from Amp.1 and the output beams from the two-stage amplifier system without and with two-dimensional BSF.
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Table 1. Parameters of the HVBGs used in the simulation.
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