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期刊Femtosecond laser fabrication of long period fiber gratings and applications in refractive index sensing
《Optics and Laser Technology》Li, Benye[1]; Jiang, Lan[1]; Wang, Sumei[1]; Tsai, Hai-Lung[2]; Xiao, Hai[3]
An improved point-by-point inscription method is proposed to fabricate long period fiber gratings (LPFGs) by using a laser operating at 800 nm with 35 fs duration pulses. The sensitivity to misalignment between the co...显示全部
关键词:Fibers Heat treatment Light refraction Refractive index Sensors Thermodynamic stability Ultrashort pulses 
期刊Microstructures and properties of TiN reinforced Co-based composite coatings modified with Y2O3 by laser cladding on Ti-6Al-4V alloy
《Journal of Alloys and Compounds》Weng, Fei[1,3]; Yu, Huijun[2,3]; Chen, Chuanzhong[1,3]; Liu, Jianli[1,3]; Zhao, Longjie[1,3]
In this study, TiN reinforced composite coatings were fabricated on Ti-6Al-4V substrate by laser cladding with Co42 self-fluxing alloy, TiN and Y2O3 mixed powders. Microstructures and wear resistance of the cladding c...显示全部
关键词:Aluminum Aluminum coatings Cladding (coating) Laser cladding Microhardness Microstructure Reinforcement Titanium alloys Titanium carbide Titanium compounds Titanium nitride Vanadium alloys Wear resistance 
期刊Traffic Sign Occlusion Detection Using Mobile Laser Scanning Point Clouds
《IEEE Transactions on Intelligent Transportation Systems》Huang, Pengdi[1]; Cheng, Ming[1]; Chen, Yiping[1]; Luo, Huan[1]; Wang, Cheng[1]; Li, Jonathan[1,2]
For survey and maintenance of traffic signs, this paper presents a novel traffic sign occlusion detection method using 3-D point clouds and trajectory data acquired by a mobile laser scanning system. To produce a main...显示全部
关键词:Laser applications Roads and streets Surface analysis 
期刊Quantum-dot superluminescent diodes with improved performance
《Quantum Electronics》Andreeva, EV; Lapin, PI; Prokhorov, VV; Yakubovich, SD
It is shown that optimisation of the structure of the active channel ofquantum-dot InAs/AlGaAs/GaAs super-luminescent diodes (SLDs) provides a noticeable increase in theirexternal quantum efficiency. The output ew pow...显示全部
关键词:superluminescent diodes  radiation efficiency  quantum dots  DIFFERENTIALEFFICIENCY  LASERS  RANGE 
期刊Absolute photoionization cross section from the 6s6p P-1,3(1) excited statesof barium
《Journal of Physics B: Atomic, Molecular and Optical Physics》Kalyar, MA; Rafiq, M; Sami-ul-Haq; Baig, MA
We present photoionization cross section measurements from the 6s6p P-1(1)and P-3(1) excited states of barium at and above the first ionization threshold. The experimentshave been performed using a thermionic diode io...显示全部
关键词:NEAR-THRESHOLD PHOTOIONIZATION  ATOMIC BARIUM  BA-I  ABSORPTION-SPECTRUM LASER  LITHIUM  TRANSITIONS 
期刊Kinetics of the NCO plus HCNO reaction
《The Journal of Physical Chemistry A》Feng, WH; Hershberger, JF
The kinetics of the NCO + HCNO reaction were studied using infrared diodelaser absorption spectroscopy. The total rate constant was measured to be k(1) = (1.58 +/- 0.20) x10(-11) cm(3) molecule(-1) s(-1) at 298 K. Aft...显示全部
关键词:NITRIC-OXIDE  EXHAUST-GAS  SPECTROSCOPY  ACID  REDUCTION  DYNAMICS  LASER 
期刊Direct measurement of loading and loss rates in a magneto-optical trap with atom-number feedback
《Physical Review A: Atomic, Molecular, and Optical Physics》Choi, Y; Yoon, S; Kang, S; Kim, W; Lee, JH; An, K
We have measured the loading and loss rates in a magneto-optical trap only with a few atoms by directly counting atom-number changing events. Unambiguous formulas are presented for the calculation of those rates from ...显示全部
关键词:LOSS COLLISIONS  OPTICAL TRAP  VAPOR-CELL  COLD  LASER  DEMAND 
期刊Differentiation of spinach plant (Spinacia oleracea L.) development usinglaser induced fluorescence (LIF).
Norikane J; Takakura T; Tsuchiya H; Yamazaki A; Tozai K (ed.); Kubota C(ed.); Fujiwara K (ed.); Ib
A laser induced fluorescence (LIF) system was used to determine spinach (cv.Active) plant development from a distance of 1 m. Spinach plants were divided into 3 groups (32-,43- and 53-days-old). The LIF system used an...显示全部
关键词:growth  plant development  chlorophyll  laser fluorescence spectroscopy lasers  spinach  plant composition  leaves  vegetables  Spinacia oleracea  Chenopodiaceae Japan 
期刊High-speed, low-photodamage nonlinear imaging using passive pulse splitters
《Nature Methods》Ji, N; Magee, JC; Betzig, E
Pulsed lasers are key elements in nonlinear bioimaging techniques such as two-photon fluorescence excitation (TPE) microscopy. Typically, however, only a percent or less of the laser power available can be delivered t...显示全部
关键词:MULTIFOCAL MULTIPHOTON MICROSCOPY  2-PHOTON EXCITATION MICROSCOPY  FLUORESCENCE MICROSCOPY  REPETITION RATE  LIVE CELLS  LASER  ABSORPTION  GENERATION 
期刊Proposal for an All-Optical Flip-Flop Using a Single Distributed Feedback Laser Diode
《IEEE Photonics Technology Letters》Huybrechts, K.; D'Oosterlinck, W.; Morthier, G.; Baets, R.
We introduce a new concept for an all-optical flip-flop based on a single distributed feedback laser. The injection of external light into the laser results in a nonuniform carrier distribution. We will show numerica...显示全部
关键词:All-optical flip-flops  distributed feedback (DFB) lasers  optical bistability 
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