P‐112: High‐Efficiency and High‐contrast Automotive LCD Backlight Using an Advanced Light‐Guide with a Multi‐Prism Array (ALMA)

2021 ◽  
Vol 52 (1) ◽  
pp. 1266-1268
Author(s):  
Shugo Yagi ◽  
Yuichi Kanbayashi ◽  
Satoshi Tsubooka ◽  
Junichi Masuda
Keyword(s):  
High Efficiency ◽  
Light Guide ◽  
High Contrast

High Efficiency Quad Luminaire Prism Light Guide

2000 ◽  
Vol 29 (2) ◽  
pp. 24-28
Author(s):  
Peter Kan ◽  
Lorne A. Whitehead ◽  
Andrzej Kotlicki ◽  
Stephen J. Harrison ◽  
Craig S. McIntyre
Keyword(s):  
High Efficiency ◽  
Light Guide

Hollow Light Guide for Light Weight and High Efficiency Planar Illuminator

2017 ◽  
Author(s):  
Zhi Ting Ye ◽  
Yunng Min Pai ◽  
Hao-Chung Kuo ◽  
Cheng-Huan Chen
Keyword(s):  
High Efficiency ◽  
Light Guide ◽  
Light Weight

scholarly journals AUTOMATIC ESTIMATION OF SIZE PARAMETERS USING VERIFIED COMPUTERIZED STEREOANALYSIS

2011 ◽  
Vol 24 (1) ◽  
pp. 41 ◽  
Author(s):  
Peter R Mouton ◽  
Joel Durgavich ◽  
Donald K Ingram
Keyword(s):  
Biomedical Research ◽  
High Efficiency ◽  
Signal To Noise Ratio ◽  
Performance Testing ◽  
High Signal ◽  
High Contrast ◽  
Size Estimation ◽  
Labor Costs ◽  
Biological Objects ◽  
Novel Approach

State-of-the-art computerized stereology systems combine high-resolution video microscopy and hardwaresoftware integration with stereological methods to assist users in quantifying multidimensional parameters of importance to biomedical research, including volume, surface area, length, number, their variation and spatial distribution. The requirement for constant interactions between a trained, non-expert user and the targeted features of interest currently limits the throughput efficiency of these systems. To address this issue we developed a novel approach for automatic stereological analysis of 2-D images, Verified Computerized Stereoanalysis (VCS). The VCS approach minimizes the need for user interactions with high contrast [high signal-to-noise ratio (S:N)] biological objects of interest. Performance testing of the VCS approach confirmed dramatic increases in the efficiency of total object volume (size) estimation, without a loss of accuracy or precision compared to conventional computerized stereology. The broad application of high efficiency VCS to high-contrast biological objects on tissue sections could reduce labor costs, enhance hypothesis testing, and accelerate the progress of biomedical research focused on improvements in health and the management of disease.

scholarly journals Design and manufacturing of a multi-zone phase-shifting coronagraph mask for extremely large telescopes

2020 ◽  
Vol 635 ◽  
pp. A126
Author(s):  
P. Martinez ◽  
M. Beaulieu ◽  
K. Barjot ◽  
O. Guyon ◽  
C. Gouvret ◽  
...  
Keyword(s):  
Focal Plane ◽  
Depth Distribution ◽  
High Efficiency ◽  
Dynamic Range ◽  
Phase Shifting ◽  
Average Error ◽  
High Contrast ◽  
Contrast Imaging ◽  
Zone Depth ◽  
Large Telescopes

Context. High-contrast imaging of exoplanets around nearby stars with future large-segmented apertures requires starlight suppression systems optimized for complex aperture geometries. Future extremely large telescopes (ELTs) equipped with high-contrast instruments operating as close as possible to the diffraction limit will open a bulk of targets in the habitable zone around M-stars. In this context, the phase-induced amplitude apodization complex mask coronagraph (PIAACMC) is a promising concept for high-efficiency coronagraphic imaging at small angular separations with segmented telescopes. Aims. The complex focal plane mask of the PIAACMC is a multi-zone, phase-shifting mask comprised of tiled hexagons that vary in depth. The mask requires micro-fabrication techniques because it is generally made of hundreds micron-scale hexagonal zones with depths ranging over a few microns. We aim to demonstrate that the complex focal plane mask of a PIAACMC with a small inner working angle can be designed and manufactured for segmented apertures. Methods. We report on the numerical design, specifications, manufacturing, and characterization of a PIAACMC complex focal plane mask for the segmented pupil experiment for exoplanet detection facility. Results. Our PIAACMC design offers an inner working angle of 1.3 λ/D and is optimized for a 30% telescope-central-obscuration ratio including six secondary support structures (ESO/ELT design). The fabricated reflective focal plane mask is made of 499 hexagons, and the characteristic size of the mask features is 25 μm, with depths ranging over ±0.4 μm. The mask sag local deviation is measured to an average error of 3 nm and standard deviation of 6 nm rms. The metrological analysis of the mask using interferential microscopy gives access to an in-depth understanding of the component’s optical quality, including a complete mapping of the zone depth distribution zone-depth distribution. The amplitude of the errors in the fabricated mask are within the wavefront control dynamic range. Conclusions. We demonstrate the feasibility of fabricating and characterizing high-quality PIAA complex focal plane masks.

scholarly journals Electronic recorder of deviation from straightness with optical-light guide analyzer

2020 ◽  
Vol 216 ◽  
pp. 01148
Author(s):  
Nematjon Zaxidov ◽  
Shahzod Rahmatillayev ◽  
Doniyor Gafurov
Keyword(s):  
Laser Beam ◽  
Energy Intensity ◽  
High Efficiency ◽  
Fiber Optic ◽  
Light Guide ◽  
Measurement Range ◽  
Reference Line ◽  
Technical Solution ◽  
Electronic Recorder

The article discusses a technical solution aimed at improving the means of alignment measurements, based on measuring the deviation from straightness relative to the reference line set by the laser beam using a recorder, which uses a fiber-optic analyzer with a scanning shutter and an electronic block circuit that provides an increase in the measurement range when maintaining the minimum overall dimensions of the mass and energy intensity of the optoelectronic recorder with high efficiency in obtaining information on linear displacements.

OPTICAL AXIS GRATINGS IN LIQUID CRYSTALS AND THEIR USE FOR POLARIZATION INSENSITIVE OPTICAL SWITCHING

2009 ◽  
Vol 18 (01) ◽  
pp. 1-47 ◽  
Author(s):  
S. R. NERSISYAN ◽  
N. V. TABIRYAN ◽  
D. M. STEEVES ◽  
B. R. KIMBALL
Keyword(s):  
Liquid Crystals ◽  
Optical System ◽  
Optical Switching ◽  
High Efficiency ◽  
Optical Axis ◽  
Incident Light ◽  
Density Level ◽  
High Contrast ◽  
Large Area ◽  
Power Radiation

The ability of optical axis gratings (OAGs) to fully transfer the energy of an unpolarized incident light beam into the ±1st diffraction orders is explored below for development of a polarization-independent optical system with nonlinear transmission. Diffractive properties of OAGs based on azo dye doped liquid crystals (azo LCs) are efficiently controlled with low power radiation. Switching from diffractive to transmissive states of the OAG takes place within 50 ms at 60 W/cm2 power density level, while the diffractive state is restored within ~ 1 s in the absence of radiation. High contrast optical switching is demonstrated with violet as well as green laser beams. A photoswitchable OAG is paired with a light-insensitive OAG in diffraction compensation configuration to obtain an optical system switchable from high to low transmission state. The thinness of OAGs required for high contrast switching ensures high overall transmission of the system. Given also the spectrally and angularly broadband nature of OAG diffraction and the capability of azo LC material systems to respond both to cw as well as short laser pulses makes the optical system under discussion very promising for optical switching applications. Presentation of these results is preceded by an "opinionated" review of prior developments and demystifying of the fabrication technique of high efficiency large area OAGs.

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