AXIAL IRRADIANCE AND ENTROPY OF HOLOGRAPHIC OPTICAL-ELEMENTS UNDER ILLUMINATION WITH QUASI-MONOCHROMATIC LIGHT

The chromatic sensitivity of holographic optical elements for use in o ptical interconnect systems is quantified using an entropy merit funct ion. The influence of broad-band illumination on axial irradiance and intensity is studied showing that the best imaging point obtained with the minimum-entropy principle is stationary when a holographic optica l element is reconstructed with a narrow special Gaussian shape. A new merit function that takes into account the axial irradiance and the e ntropy function is introduced. This new function is used to obtain the best imaging plane in the sense of minimal aberrations and maximum ax ial irradiance.