Results 11 to 20 of about 4,497,800 (307)
Trade-Off Asymmetric Profile for Extended-Depth-of-Focus Ocular Lens
Photonics, 2022 We explore the possibility of extending the depth of focus of an imaging lens with an asymmetric quartic phase-mask, while keeping the aberration within a relatively low level.
Lenny A. Romero +2 more
doaj +1 more source
Recording of the Multiplexed Bragg Diffraction Gratings for Waveguides Using Phase Mask
Photonics, 2020 The paper describes a stable method for multiplexed recording of the Bragg diffraction gratings for waveguides using a phase mask. Diffraction waveguides in this experiment were made of photo-thermo-refractive glass.
Maria Shishova +3 more
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Extended Depth-of-Field of a Miniature Optical Endoscope Using Wavefront Coding
Applied Sciences, 2020 Endoscopic imaging is an indispensable tool for visual inspection of surfaces in hard-to-access places. The conventional optical endoscope only enables imaging the regions that lie close to the focal plane, and therefore improving the depth of field (DOF)
Lei Yang +6 more
doaj +1 more source
Fourier phasing with phase-uncertain mask [PDF]
Inverse Problems, 2013 Fourier phasing is the problem of retrieving Fourier phase information from Fourier intensity data. The standard Fourier phase retrieval (without a mask) is known to have many solutions which cause the standard phasing algorithms to stagnate and produce wrong or inaccurate solutions.
Fannjiang, Albert, Liao, Wenjing
openaire +2 more sources
A simple method for fabricating phase-shifted fibre Bragg gratings with flexible choice of centre wavelength [PDF]
, 2009 A simple technique for fabricating phase-shifted fibre Bragg gratings (PSFBGs) without the use of a phase-shifted phase mask is presented. Two, 3-mm long, standard fibre Bragg gratings (FBGs) were inscribed sequentially in singlemode fibre at the same
Ralph P. Tatam +5 more
core +1 more source
IET Image Processing, 2021 A novel asymmetric double image encryption technique is introduced to protect the algorithm from the interlopers by using hybrid chaotic structured phase masks in Arnold and Fresnel transforms.
Shivani Yadav, Hukum Singh
doaj +1 more source
Fresnel Lens Array-Based Phase Mask Location Method for Adjustable Multi-Pass Cavity
Photonics, 2023 The modulation accuracy of Multi-Plane Light Conversion (MPLC) mainly depends on the positioning accuracy of the phase mask on the Spatial Light Modulator (SLM).
Ximing Wang +5 more
doaj +1 more source
A simple and wavelength-flexible procedure for fabricating phase-shifted fibre Bragg gratings [PDF]
, 2010 A simple procedure for fabricating phase-shifted fibre Bragg gratings (PSFBGs) that does not require the use of a phase-shifted phase mask is presented.
Tatam, Ralph P. +5 more
core +1 more source
Scientific Reports, 2023 Beam tracking X-ray Phase Contrast Imaging is a “Shack-Hartmann” type approach which uses a pre-sample mask to split the x-rays into “beamlets” which are interrogated by a detector with sufficient resolution. The ultimate spatial resolution is determined
G. Lioliou +7 more
doaj +1 more source
IEEE Photonics Journal, 2017 A novel optical multiple-image hiding method is proposed based on two cascaded free-space propagation transforms in this paper. With the use of the structured phase mask in the phase retrieval algorithm, a plain image is encoded to only one statistically
Liansheng Sui, Xiao Zhang, Ailing Tian
doaj +1 more source