Extended-depth-of-field imaging with an ultra-thin folded lens.
J Opt Soc Am A Opt Image Sci Vis
; 41(6): 1185-1193, 2024 Jun 01.
Article
in En
| MEDLINE
| ID: mdl-38856435
ABSTRACT
Optical systems with extended depth of field (EDOF) are crucial for observation and measurement applications, where achieving compactness and a substantial depth of field (DOF) presents a considerable challenge with conventional optical elements. In this paper, we propose an innovative solution for the miniaturization of EDOF imaging systems by introducing an ultra-thin annular folded lens (AFL). To validate the practical feasibility of the theory, we design an annular four-folded lens with an effective focal length of 80.91 mm and a total thickness of only 8.50 mm. Simulation results show that the proposed folded lens has a DOF of 380.55 m. We further developed an AFL-based test system exhibiting a resolution of 0.11 mrad across a wide wavelength range of 486-656 nm. Additionally, we present experimental results from a miniature compact prototype, which further highlights the promising potential of folded lenses for long-range EDOF imaging.
Full text:
1
Database:
MEDLINE
Language:
En
Journal:
J Opt Soc Am A Opt Image Sci Vis
Journal subject:
OFTALMOLOGIA
Year:
2024
Type:
Article