Results 41 to 50 of about 1,228,728 (251)

Effect of Dielectric Distributed Bragg Reflector on Electrical and Optical Properties of GaN-Based Flip-Chip Light-Emitting Diodes

Micromachines, 2018
We demonstrated two types of GaN-based flip-chip light-emitting diodes (FCLEDs) with distributed Bragg reflector (DBR) and without DBR to investigate the effect of dielectric TiO2/SiO2 DBR on optical and electrical characteristics of FCLEDs.
Shengjun Zhou, Haohao Xu, Mengling Liu, Xingtong Liu, Jie Zhao, Ning Li, Sheng Liu   +6 more
doaj   +1 more source

High-power single-chip InGaN blue light-emitting diode with 3.3 W output power

Electronics Letters, 2012
The characteristics of a high-power single-chip blue light-emitting diode (LED) operating with >10 W input power are reported. The LED chip was fabricated in the form of a vertical-injection structure with chip dimensions of 1.8×1.8 mm. Electrode patterns at the n-GaN surface were designed to optimise the output power and operation voltage.
T. Jeong, J.H. Baek, J.-S. Ha, H.Y. Ryu
openaire   +1 more source

High-Power, Narrow-Linewidth, Continuous-Wave, Thulium-Doped Fiber Laser Based on MOPA

Photonics, 2023
A high-power, narrow-linewidth, continuous-wave, thulium-doped fiber laser (TDFL) based on a master-oscillator power-amplifier (MOPA) was experimentally demonstrated.
Biao Guan, Fengping Yan, Wenguo Han, Qi Qin, Dandan Yang, Ting Li, Chenhao Yu, Xiangdong Wang, Kazuo Kumamoto, Yuping Suo   +9 more
doaj   +1 more source

Multiplex electric discharge gas laser system [PDF]

, 1987
A multiple pulse electric discharge gas laser system is described in which a plurality of pulsed electric discharge gas lasers are supported in a common housing. Each laser is supplied with excitation pulses from a separate power supply.
Laudenslager, James B., Pacala, Thomas J.   +1 more
core   +1 more source

An optical reaction micro-turbine [PDF]

, 2018
To any energy flow there is an associated flow of momentum, so that recoil forces arise every time an object absorbs or deflects incoming energy. This same principle governs the operation of macroscopic turbines as well as that of microscopic turbines ...
Bianchi, Silvio, Di Leonardo, Roberto, Ferretti, Stefano, Maggi, Claudio, Vizsnyiczai, Gaszton   +4 more
core   +2 more sources

By dawn or dusk—how circadian timing rewrites bacterial infection outcomes

FEBS Letters, EarlyView.
The circadian clock shapes immune function, yet its influence on infection outcomes is only beginning to be understood. This review highlights how circadian timing alters host responses to the bacterial pathogens Salmonella enterica, Listeria monocytogenes, and Streptococcus pneumoniae revealing that the effectiveness of immune defense depends not only
Devons Mo, Catherine S. Palmer, Jacqueline M. Kimmey   +2 more
wiley   +1 more source

Be-implanted (GaAl)As stripe geometry lasers [PDF]

, 1980
GaAl)As double-heterostructure stripe geometry lasers have been fabricated using Be ion implantation. Pulsed threshold currents as low as 21 mA have been found. The light-vs-current characteristics were kink-free up to 10 mW output power and the measured
Bar-Chaim, N., Lanir, M., Margalit, S., Ury, I., Wilt, D., Yariv, A., Yust, M.   +6 more
core   +1 more source

Interplay between circadian and other transcription factors—Implications for cycling transcriptome reprogramming

FEBS Letters, EarlyView.
This perspective highlights emerging insights into how the circadian transcription factor CLOCK:BMAL1 regulates chromatin architecture, cooperates with other transcription factors, and coordinates enhancer dynamics. We propose an updated framework for how circadian transcription factors operate within dynamic and multifactorial chromatin landscapes ...
Xinyu Y. Nie, Jerome S. Menet
wiley   +1 more source

Effects of Light Source Coherence and Offset-Launching Distance on Performance in 49.4 km Power over Multimode Fiber Systems

Photonics
Based on the offset-launching (OL) scheme, the effects of light source coherence and OL distance on the power performance of the 49.4 km power over fiber (PoF) system using multimode fiber are systematically investigated. We analyzed the effects of light
Yuemei Li, Yao Guo, Zhaoyang Zhang, Haobo Guo, Zhiguo Zhang   +4 more
doaj   +1 more source

Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback

IEEE Photonics Journal, 2019
In this paper, we construct a high power monolithic fiber laser oscillator based on a commercial ytterbium-doped fiber with core/inner cladding diameter of 25/400 μm.
Yun Ye, Xiaoming Xi, Chen Shi, Hanwei Zhang, Baolai Yang, Xiaolin Wang, Pu Zhou, Xiaojun Xu   +7 more
doaj   +1 more source