Vortex volume grating (VVG) has advantages of high diffraction efficiency (DE), excellent angular selectivity, broadspectral band, and flexible design, making it a good candidate as an orbital angular momentum (OAM) generator in highpower laser system.. In our research, a vortex volume grating with a relative diffraction efficiency of 84.58% and anangular spectrum of 1.864 mrad at 1064 nm is fabricated, and the refractive index modulation (RIM) is retrieved.
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