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Diffraction efficiency

About: Diffraction efficiency is a research topic. Over the lifetime, 10320 publications have been published within this topic receiving 158298 citations.


Papers
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Journal ArticleDOI
TL;DR: This work has successfully fabricated arrays of eight-level diffractive microlenses with varying focal lengths and decenters with diffraction-limited focusing and near-theoretical diffraction efficiency.
Abstract: We describe a method of fabricating multilevel diffractive optics by excimer laser ablation. A portion of a chrome mask containing many patterns is illuminated by 193-nm laser light and imaged by an objective lens onto a poly(imide) substrate. Ablation of an entire single pattern is achieved in a single laser pulse. Multiple pulses are used to vary the ablation depth, and multiple patterns are used to create a variety of multilevel optics. We have successfully fabricated arrays of eight-level diffractive microlenses with varying focal lengths and decenters. The optics performed with diffraction-limited focusing and near-theoretical diffraction efficiency (92%).

43 citations

Patent
25 Jan 1996
TL;DR: In this paper, the authors proposed a dynamic multiple-wavelength filter which selects at least one wavelength from a beam of radiation incident on a Stratified volume Holographic Optical Element (SVHOE) in accordance with the Bragg condition.
Abstract: A dynamic multiple-wavelength filter which selects at least one wavelength from a beam of radiation incident on a Stratified volume Holographic Optical Element (SVHOE) in accordance with the Bragg condition. The SVHOE has a number n of grating layers i and a hologram of a grating vector Ki is recorded in each grating layer i. A number n-1 of buffer layers are interposed between grating layers i such that the layers SVHOE presents an alternating structure of grating and buffer layers. The filter has a diffraction efficiency control, preferably based on the ECD effect, for selectively varying the diffraction efficiency η in at least one grating layer i to select from the beam of radiation a narrow bandwidth centered about Bragg wavelength λB i of grating layer i.

43 citations

Journal ArticleDOI
01 Sep 2013-Optik
TL;DR: In this article, the authors proposed high efficiency 1D silicon-silicon carbide (Si-SiC) and Si-SiO grating structures which can be used as optical interconnects in optical communication system.

43 citations

Journal ArticleDOI
TL;DR: The silica gel-methyl methacrylate organically modified ceramic is proposed for recording of volume holograms and Virtually no changes in diffraction efficiency were observed after thermal-heating, light-curing, and long-term-aging experiments.
Abstract: The silica gel–methyl methacrylate organically modified ceramic is proposed for recording of volume holograms. Both low-spatial-frequency (54 line pairs/mm−1) and high-spatial-frequency (1400 line pairs/mm−1) holographic gratings were successfully recorded in the medium by interference of two coherent beams of 351.1-nm wavelength. High diffraction efficiencies (93%) and extremely low absorption and scattering coefficients were measured during the holographic reconstruction by a 632.8-nm He–Ne beam. The optimum UV recording exposure was ~3 J cm−2. A grating refractive-index modulation amplitude of 1.1 × 10−4 was achieved. Virtually no changes in diffraction efficiency were observed after thermal-heating, light-curing, and long-term-aging experiments.

43 citations

Proceedings ArticleDOI
17 Jun 1994
TL;DR: In this paper, the authors report on the progress in their development of a novel system where holographic gratings are recorded in a single step process and consist of periodic polymer-dispersed liquid crystal planes.
Abstract: Switchable holographic gratings are desirable for a wide range of applications in diffractive optics. Liquid crystalline materials look attractive for these devices because of their large field- induced birefringence. The combination of electro-optical liquid crystals with photopolymeric holographic materials offers a unique single system approach to the economical fabrication of switchable holograms. We report on the progress in our development of a novel system where holographic gratings are recorded in a single step process and consist of periodic polymer-dispersed liquid crystal planes. Gratings have been recorded with high diffraction efficiency (approaching 100%) and narrow angular selectivity (<1 degree(s) FWHM). The diffraction efficiency can be controlled electrically or thermally

43 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202391
2022188
2021167
2020223
2019259
2018259