VBG has a variety of different uses. It can be used as a narrow Angle selector to select different angles of the same wavelength. It can also be used as a narrowband wavelength selector to select different wavelengths in the same direction, with a spectral filter width of up to 0.1nm. At the same time, the VBG can also amplify the deflection Angle, which can easily achieve more than 45° Angle deflection.