Abstract: We discuss a low cost fabrication method of a diffractive microlens with high performance for both blue and red DVD objective lenses,which consists of single-step photolithography and a wet etching process.The surface roughness of the fabricated micro-optics structure is in the nanometer range;The feature height of the diffractive phase step is in the sub-micrometer range;And can be adjusted according to requirements;And the optical aperture of the microlens can be changed from millimeter to centimeter magnitude.A large number of basic phase structures in the diffractive microlens can be set and arranged by a diffractive integrating algorithm according to the appearance and feature parameters of the beam process.Far field optical measurement shows a high diffractive efficiency of the fabricated diffractive structure.

Key words: diffractive microlens with high performance, diffractive integrating algorithm, single step photolithography, wet etching technology, DVD object lens