Measurements of the Angular Spectrum of Stray-light for Holographic Optical Elements in Dichromated Gelatin

Abstract

Abstract The angular spectrum of stray-light from holographic optical elements is measured at wavelengths of 488 nm and 1·5 μm. Holographic optical elements, for deflecting or splitting incident light beams, are recorded as volume transmission phase gratings in dichromated gelatin. The holographic optical elements are characterized with regard to their diffraction efficiency and stray-light. The diffraction efficiency is 80–85% of the incident light. The stray-light is mostly found within spurious diffraction orders or reflected beams. A signal-to-background ratio better than 1:10−4 indicates than these elements are not inherently noisy or hazy.