A novel two- and multi-level binary phase mask design for enhanced depth-of-focus

TL;DR

This paper presents a novel multi-level phase mask design using wavefront coding techniques to significantly enhance the depth of focus in optical systems, especially in midwave infrared imaging, with potential for lensless configurations.

Contribution

The paper introduces a new multi-level phase mask design incorporating cubic wavefront coding, enabling improved depth of focus and potential for flat, lensless optical systems.

Findings

High-quality images achieved with large defocus in MWIR simulations

Design enables flat, single-element optical systems without traditional lenses

Wavefront coding effects realized through phase mask design and algorithms

Abstract

This paper introduces a two-and multi-level phase mask design for improved depth of focus. A novel technique is proposed incorporating cubic and generalized cubic wavefront coding (WFC). The obtained system is optical-electronic requiring computational deblurring post-processing, in order to obtain a sharp image from the observed blurred data. A midwave infrared (MWIR) system is simulated showing that this design will produce high quality images even for large amounts of defocus. It is furthermore shown that this technique can be used to design a flat, single optical element, systems where the phase mask performs both the function of focusing and phase modulation. It is demonstrated that in this lensless design the WFC coding components can be omitted and WFC effects are achieved as a result of the proposed algorithm for phase mask design which uses the quadratic phase of the thin refractive lens as the input signal.