Results 11 to 20 of about 1,288 (199)
Extension ratio of depth of field by wavefront coding method
Optics Express, 2008 An analysis of the depth of field (DOF) of the wavefront coding imaging system with a cubic phase mask is presented. A necessary condition on the base of that MTF of wavefront coding system is defocus-independent is described. Then the extension ratio of the DOF relative to that of traditional optical system is calculated.
Rongfu Zhang, Jiabi Chen
exaly +3 more sources
Coherent detector for the non-separability measurement of vectorial structured light [PDF]
Light: Science & ApplicationsAtmospheric turbulence distorts the complex wavefront of light in free-space optical communication systems, leading to bit errors and even communication interruptions.
Yize Liang +13 more
doaj +2 more sources
Photonic terahertz phased array via selective excitation of nonlinear Pancharatnam-Berry elements [PDF]
Nature CommunicationsPhased arrays are crucial in various technologies, such as radar and wireless communications, due to their ability to precisely control and steer electromagnetic waves.
Li Niu +13 more
doaj +2 more sources
Applied Sciences, 2023 Phase mask optimization is one of the critical steps in designing a wavefront coding system to extend the depth of field (DoF). As a classical phase mask, a cubic phase mask was taken as an example. An improved particle swarm optimization (PSO) algorithm
Zeyu Huang +4 more
doaj +1 more source
Spectrally exclusive phase masks for wavefront coding [PDF]
Optics Letters, 2021 The use of phase masks is necessary for wavefront coding, and these are often based on optical path differences. However, the optical dispersion constrains the resulting device to operate within a restricted spectral bandwidth. Here we propose to remove this constraint due to sub-wavelength structuration of the surface.
Micke Boher +4 more
openaire +2 more sources
A Retroreflection Reduction Technique Based on the Wavefront Coded Imaging System
Crystals, 2021 A novel anti-cat-eye effect imaging technique based on wavefront coding is proposed as a solution to the problem of previous anti-cat-eye effect imaging techniques where imaging quality was sacrificed to reduce the retroreflection from the photoelectric ...
Qing Ye +5 more
doaj +1 more source
Acoustic wavefront manipulation via transmission-type labyrinth structure
Frontiers in Physics, 2022 In this work, a transmission-type labyrinth structure (LS) is proposed to construct subwavelength acoustic functional metasurfaces, through which various desirable acoustic wavefront manipulation can be achieved in a broadband from 2,700 Hz to 3,900 Hz ...
Rui Wang, Fengbao Yang
doaj +1 more source
Wavefront coding for laser protection of electro-optical imaging systems: a long-distance experimental study [PDF]
Frontiers of OptoelectronicsWavefront coding technology employs a phase mask to modulate the phase of incident light, thereby dispersing the laser spot on the detector and achieving laser protection for optical systems.
Ye Liu +7 more
doaj +1 more source
Learning Wavefront Coding for Extended Depth of Field Imaging [PDF]
IEEE Transactions on Image Processing, 2021 Depth of field is an important factor of imaging systems that highly affects the quality of the acquired spatial information. Extended depth of field (EDoF) imaging is a challenging ill-posed problem and has been extensively addressed in the literature.
Ugur Akpinar +4 more
openaire +5 more sources
Nuclear Engineering and Technology, 2021 The laser transport system of the high power laser facility is mainly composed of large-aperture laser transport mirrors (TMs). Obtaining the high-resolution online damage images during the operation, which is of great significance for operating safely ...
Wang Fang +4 more
doaj +1 more source