1200 l/mm VPH Grating
Measured efficiency in unpolarized light for the 1200 l/mm VPH grating. The solid line shows the efficiency at a grating angle of 19 deg. The dashed line shows the peak efficiency curve as the grating is tuned to different grating angles (the super blaze). The dotted line shows the efficiency for a theoretical 1200 l/mm surface-relief grating with similar blaze characteristics.