MEASUREMENTS OF THE ANGULAR SPECTRUM OF STRAY-LIGHT FOR HOLOGRAPHIC OPTICAL-ELEMENTS IN DICHROMATED GELATIN

The angular spectrum of stray-light from holographic optical elements is measured at wavelengths of 488 nm and 1-5 mum. Holographic optical elements, for deflecting or splitting incident light beams, are record ed as volume transmission phase gratings in dichromated gelatin. The h olographic optical elements are characterized with regard to their dif fraction efficiency and stray-light. The diffraction efficiency is 80- 85% of the incident light. The stray-light is mostly found within spur ious diffraction orders or reflected beams. A signal-to-background rat io better than 1:10(-4) indicates than these elements are not inherent ly noisy or hazy.