Results 21 to 30 of about 90,088 (87)

Influence of Coupled Structural Parameters of Photoconductive Antennas on the Terahertz Narrowband Detection Performance of High Sensitivity and Frequency Selection

International Journal of Optics
Narrowband terahertz (THz) detection plays a key role in biomedical imaging, biological applications, and security screening. Particularly rapid resolution of material differences based on spectral fingerprints or time-resolved observation of the ...
Zhonggang Xiong, Linyu Chen, Zhong Liu, Shuai Kang   +3 more
doaj   +1 more source

Canonical and Singular Propagation of Ultrashort Pulses in a Nonlinear Medium

International Journal of Optics, 2012
We examine the two types of singular behaviors of ultrashort pulses in a nonlinear medium, pulse steepening if the weak longitudinal dispersion is normal and collapse if it is anomalous.
Karl Glasner, Miroslav Kolesik, Jerome V. Moloney, Alan C. Newell   +3 more
doaj   +1 more source

Application Research of Frequency-Modulated Continuous-Wave Displacement Sensor Based on Zero-Crossing Phase Detecting Algorithm

International Journal of Optics, 2021
Frequency-modulated continuous-wave (FMCW) interference, as a new technology of laser interferometry, has the advantages of length traceability, large range, high accuracy, simple structure, and optical fiber transmission.
Bin Sun, Junfang Song, Gang Zheng, Xiongxing Zhang   +3 more
doaj   +1 more source

Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

Journal of Spectroscopy, 2016
Hexagonal nanoarrays of Au nanorods and nanopillar were deposited on nanoporous anodic alumina (PAA) membranes utilizing dc electrodeposition. The surface morphologies and optical properties were characterized by using field emission-scanning electron ...
Mohamed Shaban
doaj   +1 more source

In-Fiber Subpicosecond Pulse Shaping for Nonlinear Optical Telecommunication Data Processing at 640 Gbit/s

International Journal of Optics, 2012
We review recent work on all-fiber (long-period fiber grating) devices for optical pulse shaping, particularly flat-top pulse generation, down to the subpicosecond range and their application for nonlinear switching (demultiplexing) of optical time ...
J. Azaña, L. K. Oxenløwe, E. Palushani, R. Slavík, M. Galili, H. C. H. Mulvad, H. Hu, Y. Park, A. T. Clausen, P. Jeppesen   +9 more
doaj   +1 more source

Research on Correction Method of Water Quality Ultraviolet-Visible Spectrum Data Based on Compressed Sensing

Journal of Spectroscopy, 2021
The turbidity interference caused by suspended particles in water seriously affects the accuracy of ultraviolet-visible spectroscopy in detecting water quality chemical oxygen demand.
Fengxiao Li, Bin Tang, Mingfu Zhao, Xinyu Hu, Shenghui Shi, Mi Zhou   +5 more
doaj   +1 more source

Feasibility of Using Near-Infrared Reflectance Spectroscopy to Predict the Chemical Composition of Giraffe (Giraffa camelopardalis) Faeces

Journal of Spectroscopy
To determine the feasibility of near-infrared spectroscopy (NIRS) for the measurement of certain chemical compounds, a collection of both representative spectral data and reference measurements from many samples (training set) should be compared as part ...
Andri Grobbelaar, Gerbrecht Christina Josling, Ferdi van Lingen, Gernot Osthoff, Francois Deacon   +4 more
doaj   +1 more source

Bragg-Scattering Four-Wave Mixing in Nonlinear Fibers with Intracavity Frequency-Shifted Laser Pumps

International Journal of Optics, 2012
We experimentally study four-wave mixing in highly nonlinear fibers using two independent and partially coherent laser pumps and a third coherent signal. We focus our attention on the Bragg-scattering frequency conversion.
Katarzyna Krupa, Michela Bettenzana, Alessandro Tonello, Vincent Couderc, Philippe Di Bin, Stefan Wabnitz, Alain Barthélémy   +6 more
doaj   +1 more source

Femtosecond Laser Inscribed Multiwavelength Cascaded FBG Array Using Point-By-Point Method for Temperature Sensing Based on Swept Laser Demodulation Technique

International Journal of Optics
A femtosecond laser inscribed quintuple-wavelength cascaded fiber Bragg grating (FBG) array for temperature sensing system based on swept laser source was proposed and experimentally demonstrated.
Jia Liu, Bai Zhang, Yiwei Liu
doaj   +1 more source

Inhibition Effect of Phosphorus Flame Retardants on the Fire Disasters Induced by Spontaneous Combustion of Coal

Journal of Spectroscopy, 2017
Coal spontaneous combustion (CSC) generally induces fire disasters in underground mines, thus causing serious casualties, environmental pollution, and property loss around the world.
Yibo Tang
doaj   +1 more source