Apparatus for measuring characteristics of a reflection-type holographic optical element

摘要

An apparatus for simultaneously measuring in real time for a reflection-type holographic optical element the wavelength of maximum diffraction efficiency, the angular and spectral selectivities, and the direction of the grating vector by analyzing the characteristics of the intensity distribution of the transmitted beam. A diverging or diffusive beam having an angle of divergence greater than the incident angle satisfying the Bragg condition of the holographic optical element under measurement. The apparatus comprises a multi-wavelength oscillation laser beam source, a beam diffuser, a objective lens, and an image projection screen.