نتایج جستجو برای: diffractive optical element
تعداد نتایج: 468384 فیلتر نتایج به سال:
Diffractive lenses differ from conventional optical elements in that they can produce more than one image because of the presence of more than one diffraction order. These spurious, defocused images serve to lower the contrast of the desired image. We show that a quantity that we define as the integrated efficiency serves as a useful figure of merit to describe diffractive lenses. The integrate...
The fabrication of submicron-height sine-like relief of a trifocal diffractive zone plate using a nanoimprinting technique is studied. The zone plate is intended for use in combined trifocal diffractive–refractive lenses and provides the possibility to form trifocal intraocular lenses with predetermined light intensity distribution between foci. The optical properties of the designed zone plate...
Diffractive optical elements are components relying on the physical phenomena of diffraction and interference to control the propagation of light. Such elements are usually macroscopically planar microstructures, consisting of features with dimensions from a couple of wavelengths to a few tens of microns and being designed by advanced numerical algorithms based on rigorous diffraction theory. T...
In this article a camera-based single-image sensor is presented, that able to measure the distance of multiple object points. The experimental results show an accuracy 8,51 μm within depth range 20 mm. consists camera, whose lens upgraded with diffractive optical element (DOE). It fulfils two tasks: adding vortex point spread function (PSF) and replication PSFs predefined pattern K spots. Both,...
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