Real-time splitting behavior of stratified holographic optical elements

A new method for the preparation of stratified light- sensitive film is developed and the stratified gratings are recorded in the film. The real-time splitting behavior concerning angular sensitivity and diffraction properties as a function of the normalized buffer-layer thickness in this stratified holographic optical gratings have been analyzed. It is found that by optimizing the combination of modulation of grating, spatial frequency and the total thickness of grating, the changeable number of output beams can be obtained.