Results 21 to 30 of about 9,926 (249)

High bandwidth frequency modulation of an external cavity diode laser using an intracavity lithium niobate electro-optic modulator as output coupler

APL Photonics, 2022
We present a novel approach to high bandwidth laser frequency modulation. A lithium niobate chip is used as an intracavity electro-optic modulator in a tunable cateye external cavity diode laser.
S. Palmer, A. Boes, G. Ren, T. G. Nguyen, S. J. Tempone-Wiltshire, N. Longhurst, P. M. Farrell, A. Steiner, Ch. D. Marciniak, T. Monz, A. Mitchell, R. E. Scholten   +11 more
doaj   +1 more source

Active optical clock lasing on the Cs 7S1/2-6P3/2 transition under a weak magnetic field

Frontiers in Physics, 2022
In the bad-cavity limit, the collective atomic dipole is highly coherent, resulting in the phase information of an active optical clock (AOC) laser primarily stored in the atomic gain medium.
Tiantian Shi, Jianxiang Miao, Jia Zhang, Jingbiao Chen, Jingbiao Chen   +4 more
doaj   +1 more source

Characterization of Hybrid InP-TriPleX Photonic Integrated Tunable Lasers Based on Silicon Nitride (Si ₃N₄/SiO₂) Microring Resonators for Optical Coherent System

IEEE Photonics Journal, 2018
We demonstrate detailed characterization results of a hybrid InP-TriPleX photonic integrated tunable laser based on silicon nitride microring resonators.
Yi Lin, Colm Browning, Roelof Bernardus Timens, Douwe H. Geuzebroek, Chris G. H. Roeloffzen, Marcel Hoekman, Dimitri Geskus, Ruud M. Oldenbeuving, Rene G. Heideman, Youwen Fan, Klaus J. Boller, Liam P. Barry   +11 more
doaj   +1 more source

High Pulse Energy, Narrow Linewidth 6.45 μm from an Optical Parametric Oscillator in BaGa₄Se₇ Crystal

Applied Sciences, 2022
This paper presents a high pulse energy, narrow linewidth, mid-infrared (MIR) laser at 6.45 μm, based on a BaGa4Se7 (BGSe) crystal optical parametric oscillator (OPO) pumped by 1.064 μm laser. The maximum pulse energy at 6.45 μm was up to 1.23 mJ, with a
Yu Shen, Ning Wen, Chunxiao Li, Nan Zong, Jiyong Yao, Jinquan Chang, Ya Wen, Feng Yang, Wenlong Li, Hongwei Gao, Yong Bo, Qinjun Peng, Dafu Cui   +12 more
doaj   +1 more source

Laser Linewidth Measurement Using an FPGA-Based Delay Self-Homodyne System

Photonics
Narrow-linewidth lasers play a crucial role in nonlinear optics, atomic physics, optical metrology, and high-speed coherent optical communications.
Fanqi Bu, Zhongan Zhao, Longfei Li, Cunwei Zhang, Tie Li, Yaoyao Qi, Jie Ding, Bingzheng Yan, Chen Zhao, Yulei Wang, Zhiwei Lu, Yu Ding, Zhenxu Bai   +12 more
doaj   +1 more source

Neurochemical Endpoints to Inform Early‐Stage Trials of Spinocerebellar Ataxia 2 and 3 in a Multisite Setting

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Neurochemical levels measured by brain MR spectroscopy (MRS) have been proposed as endpoints for clinical trials in early‐stage spinocerebellar ataxia (SCA) trials. We tested their trial‐readiness by quantifying neurochemicals in three affected brain regions in early‐stage cohorts of SCA2 and SCA3, examining their reproducibility in ...
James M. Joers, Yaqiao Wei, Dinesh K. Deelchand, Adam Berrington, Young Woo Park, Guita Banan, Michal Povazan, Jens T. Rosenberg, André J. W. van der Kouwe, Tetsuo Ashizawa, Khalaf O. Bushara, Chiadi U. Onyike, Sub H. Subramony, Jeremy D. Schmahmann, Brian J. Soher, Peter B. Barker, Thomas H. Mareci, Eva‐Maria Ratai, Lynn E. Eberly, Gülin Öz   +19 more
wiley   +1 more source

Noise Suppression on the Tunable Laser for Precise Cavity Length Displacement Measurement

Sensors, 2016
The absolute distance between the mirrors of a Fabry-Perot cavity with a spacer from an ultra low expansion material was measured by an ultra wide tunable laser diode.
Radek Šmíd, Martin Čížek, Břetislav Mikel, Jan Hrabina, Josef Lazar, Ondřej Číp   +5 more
doaj   +1 more source

Encyclopedia of 2D β′‐In2Se3 Growth Using Chemical Vapor Deposition: The Effects of Synthesis Parameters Onto Material Quality

Advanced Engineering Materials, EarlyView.
A distinct semi‐confined inner‐tube chemical vapor deposition geometry enables reproducible, large‐area growth of phase‐pure 2D β′‐In2Se3 from InI + Se precursors. Engineering local vapor transport and optimizing precursor delivery and temperature–time conditions yield uniform continuous films.
Dasun P. W. Guruge, P. Sanju S. Panawala, Joseph F. S. Fernando, Zhenhuan Chen, Chao Zhang, Dong‐Chen Qi, Liangzhi Kou, Konstantin L. Firestein, Dmitri V. Golberg   +8 more
wiley   +1 more source

Dynamic Device Characteristics and Linewidth Measurement of InGaN/GaN Laser Diodes

IEEE Photonics Journal, 2021
We report on the characterization and analysis of a GaN-based distributed feedback laser diode (DFB-LD) with 3rd-order laterally etched sidewall gratings centered at a wavelength of 420 nm.
Steffan Gwyn, Scott Watson, Thomas Slight, Martin Knapp, Shaun Viola, Pavlo Ivanov, Weikang Zhang, Amit Yadav, Edik Rafailov, Mohsin Haji, Kevin E Doherty, Szymon Stanczyk, Szymon Grzanka, Piotr Perlin, Stephen P Najda, Mike Leszczyski, Anthony E Kelly   +16 more
doaj   +1 more source

Linewidth measurements with optical methods.

Journal of the Japan Society of Precision Engineering, 1985
IC,LSI製造工程において,光学的な寸法測定は,通常,原版となるフォトマスクやレチクルの座標やパターン線幅の測定と,デバイスとなるウエハの工程中での種々の膜厚測定やパターンの線幅測定が主である.近年,メモリーを中心とするパターンの高集積化,微細化が著しく進展し,寸法測定管理の精度及び頻度は急速に高くなり,その重要性は一層増加してきている.これは,寸法計測が,より厳しくなるプロセスの管理上必要な数多くの情報を提供してくれる重要なモニタとなるからである.このような中で,現在主流となっている光学方式のパターン寸法測定の現状と,今後のプロセスの発展に対して,実用レベルで対応してゆける光学測定機のあり方について概観してゆくことにする.
openaire   +2 more sources