Multifocal spectral diffractive lens [PDF]
Компьютерная оптика, 2018 We present a method for calculating a spectral multifocal diffractive lens that forms a given set of fixed-position foci at multiple operating wavelengths. It is based on minimizing a function represented as a squared absolute value of difference between
Leonid Doskolovich +2 more
doaj +3 more sources
Hybrid Refractive-Diffractive Lens with Reduced Chromatic and Geometric Aberrations and Learned Image Reconstruction. [PDF]
Sensors (Basel), 2022 In this paper, we present a hybrid refractive-diffractive lens that, when paired with a deep neural network-based image reconstruction, produces high-quality, real-world images with minimal artifacts, reaching a PSNR of 28 dB on the test set.
Evdokimova VV +10 more
europepmc +2 more sources
Design, Fabrication and Analysis of a Hybrid-Order Monolithic Imaging Diffractive Lens on a Germanium Substrate [PDF]
Micromachines, 2023 Diffractive optical elements are gradually replacing some conventional optical elements and becoming a key component of optical systems due to their unique phase modulation function.
Yidi Zheng +12 more
doaj +2 more sources
755-nm Alexandrite Picosecond Laser with a Diffractive Lens Array or Zoom Handpiece for Post-Inflammatory Hyperpigmentation: Two Case Reports with a Three-Year Follow-Up. [PDF]
Clin Cosmet Investig Dermatol, 2021 Objective Post-inflammatory hyperpigmentation (PIH) is a reactive hypermelanosis of various skin types, which occurs as a sequela of cutaneous inflammation or injury.
Ren R, Bao S, Qian W, Zhao H.
europepmc +2 more sources
Design of a Hybrid Refractive/Diffractive Lens System for Broadband UV [PDF]
Sensors, 2022 Traditional broadband UV optical designs often have complex structural problems and cannot meet the current requirements of light and miniaturization.
Yuan Hu, Jiaqi Huo, Binpeng Cheng
doaj +2 more sources
Photonics, 2022 Direct imaging systems that create an image of an object directly on the sensor in a single step are prone to many constraints, as a perfect image is required to be recorded within this step.
Shivasubramanian Gopinath +10 more
doaj +2 more sources
Randomly Multiplexed Diffractive Lens and Axicon for Spatial and Spectral Imaging. [PDF]
Micromachines (Basel), 2020 A new hybrid diffractive optical element (HDOE) was designed by randomly multiplexing an axicon and a Fresnel zone lens. The HDOE generates two mutually coherent waves, namely a conical wave and a spherical wave, for every on-axis point object in the ...
Anand V, Katkus T, Juodkazis S.
europepmc +2 more sources
Impact of fabrication errors and refractive index on multilevel diffractive lens performance. [PDF]
Sci Rep, 2020 Multilevel diffractive lenses (MDLs) have emerged as an alternative to both conventional diffractive optical elements (DOEs) and metalenses for applications ranging from imaging to holographic and immersive displays.
Banerji S, Cooke J, Sensale-Rodriguez B.
europepmc +3 more sources
Broadband imaging with one planar diffractive lens. [PDF]
Sci Rep, 2018 We demonstrate imaging over the visible band using a single planar diffractive lens. This is enabled via multi-level diffractive optics that is designed to focus over a broad wavelength range, which we refer to as an achromatic diffractive lens (ADL). We
Mohammad N +4 more
europepmc +3 more sources
Calculation of a diffractive lens having a fixed focal position at several prescribed wavelengths [PDF]
Компьютерная оптика, 2019 A method for calculating a “spectral” diffractive lens, which ensures the preservation of the focal position at several prescribed wavelengths is proposed.
Leonid Doskolovich +4 more
doaj +2 more sources