Opto-Line International, Inc. is a customer oriented small business that strives to provide outstanding quality and service. From a small order of one part to high volume needs, Opto-Line treats every job as critical and dedicates its resources, knowledge and skills to delivering exceptional reticles, apertures and precision patterns. Photolithography, also termed optical lithography or UV lithography, is a process used in microfabrication to pattern parts of a thin film or the bulk of a substrate. It uses light to transfer a geometric pattern from a photomask to a light-sensitive chemical photoresist, or simply “resist,” on the substrate.