Diffractive Multifocal Lens Design Using Phase Retrieval

A method to design diffractive multifocal lenses using phase retrieval was proposed. The phase-retrieval lens could achieve the desired diffraction efficiencies at the targeted foci while maintaining a continuous profile without abrupt steps. An example of an optimum triplicator provided an overall efficiency of 92.59%, matching previously published findings. Another example of a trifocal design showed competitive performance against state-of-the-art methods, and a 5-foci design demonstrated the versatility of the method. With its merits, the proposed method can enhance the performance of multifocal intraocular lenses and cater to other applications requiring multifocality, such as optical tweezers.