Abstract
A method for beam diffraction sidelobe suppression based on the combination of
volume Bragg gratings (VBGs) with different thicknesses or periods for angular filtering
is proposed and performed. Simulated and experimental results show that the beam
diffraction sidelobe is reduced from 12% to less than 1% with the non-sidelobe angular
filter. The non-sidelobe angular filtering based on VBGs with thicknesses of 2.5 and
2.9 mm is simulated and demonstrated. The near-field distribution of filtered beams
through the non-sidelobe angular filter is obviously smoother than that of the single
VBG. The near-field modulation and contrast ratio (C) of filtered beams are found to be
improved 1.17 and 1.66 times that of the single VBG. The far-field C of the filtered
beam is improved to about 100∶1 and the power spectral density analysis shows that the
cutoff frequency of the angular filter is greatly optimized with the VBG
combination.
© 2016 Chinese Laser Press
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