AN OPTICAL DEVICE COMPRISING A MULTI-ORDER DIFFRACTIVE FRESNEL LENS (MOD-DFL) AND AN ACHROMATIZING COMPENSATION MECHANISM

摘要

An optical device is provided that comprises a multi-order diffractive Fresnel lens (MOD-DFL) and an achromatizing compensation mechanism that reduces refractive dispersion created by the MOD-DFL, thereby reducing the focal range of the MOD-DFL. A method is also provided of using the optical device in an image processing system to obtain images of an object and processing the images to perform image enhancement.