Optical properties of GRIN fiber lens arrays: dependence on fiber length.

The optical imaging and radiometric properties of arrays of GRIN fiber lenses (Selfoc lens arrays) have been studied as a function of the length of the fibers. Experiments measured the object-to-image distance, image quality (MTF), depth of focus, image irradiance distribution, and exposure for a set of Selfoc lenses with differing fiber length. Simple models were used to explain the observed dependences, and analytical formulas were developed for the prediction of these optical properties.