Results 221 to 230 of about 2,528 (265)
Some of the next articles are maybe not open access.
Design of Diffractive Optical Elements
2017Diffractive optical elements tailor optical fields via diffraction. The diffraction patterns of standard apertures such as single slit, double slit, circular aperture, and square slit are well known. However, for applications, apertures with higher levels of complexity may be required. A DOE can be thought of as a special aperture and can be engineered
A. Vijayakumar, Shanti Bhattacharya
openaire +1 more source
Diffractive optical element for optical data storage
SPIE Proceedings, 2013The diffractive optical element (DOE) has the transformation function of wavefront, and its applications are forming or homogenization of beam, and aberration correction, and so on. In this study, we evaluate possibility as storage application of the DOE. The optical data storage using the DOE is thought of as a kind of holographic data storage (HDS)
S. Yoshida +5 more
openaire +1 more source
Crossed phase gratings with diffractive optical elements
Applied Optics, 1998Orienting two identical or complementary diffractive gratings with a small angle between the grating grooves allows a new crossed-grating device to be constructed. This device has an effective profile that varies locally. For understanding the effects of this variation and the diffraction efficiency of the gratings, the local profiles were correlated ...
W S, Rockward, D C, O'Shea
openaire +2 more sources
Micro- and Diffractive Optical Elements
2018With the rapid development of modern optics and optoelectronic technology, optoelectronic components have also changed greatly. Optical elements are not only limited in refractive lenses, prisms, and mirrors. New optical components such as micro-lens arrays, holographic lenses, and diffractive elements are also used in various optoelectronic devices ...
Xiujian Li +3 more
openaire +1 more source
Diffractive optical elements for optoelectronics
Diffractive Optics: Design, Fabrication, and Applications, 1992Diffractive optical elements (DOEs) rely on the deflection of light waves by diffraction on microstructures rather than on refraction by smooth surfaces. They are well-suited for applications involving monochromatic light and lasers: They are flexible in design (synthetic holograms are designed by CAD), it is possible to fabricate array-optics (several
openaire +1 more source
Fabrication of Diffractive Optical Elements
2017In earlier chapters, the design and analysis of simple and multifunctional DOEs using different techniques are presented. In this chapter, pre-fabrication techniques such as designing the lithography files, etc., and fabrication techniques with basic fabrication recipes are presented. The fabrication of micro-optical elements using photolithography has
A. Vijayakumar, Shanti Bhattacharya
openaire +1 more source
Focusing anomalies with binary diffractive optical elements
Applied Optics, 2017Binary diffractive optics have been extensively studied to date as tools for arbitrary laser beam shaping and experimentally implemented with etched transparent optics and spatial light modulators. Here we demonstrate that a simple one-step binary optic is able to enhance the intensity of a focused beam, displaying some counterintuitive focusing ...
O, Bouzid +6 more
openaire +2 more sources
Testing Diffractive Optical Elements
2009Once a surface relief pattern has been patterned in photoresist or etched into a substrate, how do you know if you have produced what you wanted? There are many different approaches to answering this question, but all of them fall into one of two categories: (1) metrological tests that measure the dimensions and geometry of the surface structures or (2)
openaire +1 more source
Thermal Distortion of Diffraction-Limited Optical Elements
Applied Optics, 1966Recent developments of laser materials have advanced the state of the art to a point where the optical quality of many of these materials is approaching the diffraction limit. Using such components in a laser does not necessarily guarantee the generation of diffraction-limited laser beams.
openaire +2 more sources
Making a Diffractive Optical Element
2009In previous chapters we considered the fundamental theories of diffraction and a number of design approaches for diffractive optical elements. However, before a diffractive optical element can be built, a number of additional questions must be addressed. For example: - How is the design in a computer "transformed" into a physical component?
openaire +1 more source