Results 251 to 260 of about 10,427,001 (301)

CMOS self-powered monolithic light-direction sensor with digitalized output

Optics Letters, 2014
We present a novel self-powered chip to detect the direction of incident light. This chip directly provides digitized output without the need of any off-chip power supply or optical or mechanical components. The chip was implemented in a standard 0.5 μm CMOS process. A microscale metal baffle was created by stacking all metal layers, contacts, and vias
Hongyi, Wang, Tao, Luo, Zhijian, Lu, Hongjiang, Song, Jennifer Blain, Christen   +4 more
openaire   +2 more sources

MOPA configuration light source with 5 W output power

SPIE Proceedings, 2013
In this paper we present a device - fiber based coherent light source operating at 1550 nm wavelength and 5 W of the output power. It is made completely of the fiber elements without any bulk optics therefore it is stable and resistant to the environmental conditions.
Pawel Kaczmarek, Grzegorz Soboń, Adam Wąż, Grzegorz Dudzik, Arkadiusz Antończak, Krzysztof Abramski   +5 more
openaire   +1 more source

Radiometric and spectroradiometric comparison of power outputs of five visible light-curing units

Journal of Dentistry, 1993
The spectral distributions of the radiation emitted by five visible range curing lights were measured spectroradiometrically. The light intensities in specific wavelength bands were evaluated by graphical integration. The results were then compared with the instantaneous readings of power density of all of the units as measured with a commercial curing
S Y, Lee, C H, Chiu, A, Boghosian, E H, Greener   +3 more
openaire   +2 more sources

Photoelectrochemical sidewall etching enhances light output power in GaN‐based light emitting diodes

physica status solidi c, 2006
AbstractInGaN/GaN multi‐quantum‐well light‐emitting diodes (MQW LEDs) are grown through a metal‐organic chemical vapor deposition (MOCVD) System. The fabricated GaN‐based LED wafers are treated with a photoelectrochemical (PEC) wet etching process using a Hg lamp illumination and KOH solution.
C. F. Lin, J. J. Dai, R. H. Jiang, J. H. Zheng, Z. J. Yang, C. C. Yu, W. C. Lee   +6 more
openaire   +1 more source

Superluminescent light emitting diodes of 100mW output power for pico-projection

2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), 2013
A blue superluminescent LED (SLED) with power above 100mW was fabricated. These SLED shows promise for focus-free pico-projection due to reduced interference and improved image quality. We compared different straight and curved waveguide designs with and without tilted facets. Internal and mirror losses were determined by the Hakki-Paoli method.
U. T. Schwarz, F. Kopp, T. Weig, C. Eichler, U. Strauss   +4 more
openaire   +1 more source

Nanolithography for 3-dimentional nanostructures: enhancement of light output power in vertical light emitting diodes

SPIE Proceedings, 2013
We review the recent developments to enhance the external quantum efficiency (EQE) in GaN based vertical light-emitting diodes (V-LEDs). The controlling of side-wall angle by SiO2 nanosphere lithography significantly improved the light extraction efficiency (LEE) of V-LEDs; this result is 6% higher than the photo chemical etching (PCE) method, which is
Yang Hee Song, Jun Ho Son, Buem Joon Kim, Jong-Lam Lee   +3 more
openaire   +1 more source

Slow light transmission in a photonic crystal power splitter with parallel outputs

Photonics and Nanostructures - Fundamentals and Applications, 2014
Abstract In this paper, we investigate coupling of light to slow modes in a photonic crystal power splitter composed of a Y-junction and two 60° bends. First, a combination of two cascaded bends which is commonly used in integrated photonic crystal circuits is studied in slow light frequency regime.
Maliheh Khatibi Moghaddam, Mir Mojtaba Mirsalehi, Amir Reza Attari   +2 more
openaire   +1 more source

Nonlinear PI output power regulation in a light water reactor

Progress in Nuclear Energy, 2019
Abstract Robust nonlinear control of the load following operation has been attempted for a nuclear facility with a pressurized water reactor. A multi-linear model of the plant has been employed to contrive an appropriate proportional-integral (PI) controller further applied to the original nonlinear system.
openaire   +1 more source

LDLS™ Powered Tunable Light Source with Far-UVC Output

Frontiers in Optics / Laser Science, 2020
Tunable light source powered by LDLS™ with far-UVC output is proposed and evaluated. Experimental results of in-band fluxes, FWHM bandwidths between 200nm and 400nm, are presented.
X. Ye, M. Alfaris, W. Grube, D. Gustafson, H. Zhu   +4 more
openaire   +1 more source

A Multi-Output Hybrid Divided Power Converter for LED Lighting Applications

2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL), 2018
This paper introduces a novel single inductor multi-output LED driver. The converter is able to significantly reduce the area of passive components while maintaining high power processing efficiency by dividing power between a switched capacitor (SC) and a buck-boost converter and taking the output differentially from the two outputs. The volume of the
Tim McRae, Aleksandar Prodic, Sombuddha Chakraborty, William McIntyre, Alvaro Aguilar   +4 more
openaire   +1 more source