Multilevel diffractive lens in the MWIR with extended depth-of-focus and wide field-of-view

Author:

Hayward Tina M.,Qadri Syed N.1,Brimhall Nicole2,Santiago Freddie1,Christophersen Marc1,Dunay Christopher1,Espinola Richard L.1,Martin Hector1,Cheung C. C. (Teddy)1,Menon Rajesh2ORCID

Affiliation:

1. U.S. Naval Research Laboratory

2. Oblate Optics, Inc.

Abstract

Optics in the mid-wave-infra-red (MWIR) band are generally heavy, thick and expensive. Here, we demonstrate multi-level diffractive lenses; one designed using inverse design and another using the conventional propagation phase (the Fresnel zone plate or FZP) with diameter = 25 mm and focal length = 25 mm operating at λ=4μm. We fabricated the lenses by optical lithography and compared their performance. We show that the inverse-designed MDL achieves larger depth-of-focus and better off-axis performance when compared to the FZP at the expense of larger spot size and reduced focusing efficiency. Both lenses are flat with thickness ≤0.5 mm and weigh ≤3.63 g, which are far smaller than their conventional refractive counterparts.

Funder

Office of Naval Research

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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