Optical micro lenses generally refer to optical lenses with smaller geometric dimensions, and their outer diameter can reach about 0.5mm. Commonly used optical micro lenses include sub-focusing lenses, seek lenses and round rod lenses. Optical micro lenses are widely used in various devices of optical fiber communication systems; they are very important components. Based on various performance characteristics of micro lenses, they can improve the technical level of optical fiber collimators and have very important practical value.