Results 41 to 50 of about 25,400 (165)
APL Photonics, 2017 We introduce a finite-difference frequency-domain algorithm for coupled acousto-optic simulations. First-principles acousto-optic simulation in time domain has been challenging due to the fact that the acoustic and optical frequencies differ by many ...
Yu Shi, Alexander Cerjan, Shanhui Fan
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Denoising of Brillouin Gain Spectrum Images for Improved Dynamic Measurements of BOTDR
IEEE Photonics Journal, 2023 Brillouin optical time-domain reflectometry (BOTDR) is widely used for strain and temperature measurements in various fields. However, the accuracy and reliability of the measurements are often limited by the noise in the sensor signals.
Bo Li, Ningjun Jiang, Xiaole Han
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Journal of Applied Physics, 2023 We report the adiabatic elastic constants of single-crystal thorium dioxide over a temperature range of 77–350 K. Time-domain Brillouin scattering, an all-optical, non-contact picosecond ultrasonic technique, is used to generate and detect coherent acoustic phonons that propagate in the bulk perpendicular to the surface of the crystal.
Amey Khanolkar +6 more
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Vibrational spectra in glasses [PDF]
, 2001 The findings of X-ray and neutron scattering experiments on amorphous systems are interpreted within the framework of the theory of Euclidean random matrices. This allows to take into account the topological nature of the disorder, a key ingredient which
Grigera, T. S. +3 more
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Scripta Materialia, 2019 Abstract We employ gigahertz frequency ultrasonic waves to non-invasively image grain microstructure in polycrystalline ceria. This technique, termed time-domain Brillouin scattering (TDBS), is a pump-probe technique that launches and monitors ultrasonic waves as they propagate into the sample. We demonstrate TDBS's capability to image microstructure
Yuzhou Wang +6 more
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Research on the System of Pulse Synthesis Pre-pump Rayleigh BOTDA technology
MATEC Web of Conferences, 2015 The conventional Rayleigh scattering Brillouin Optical Time Domain Analysis (Rayleigh BOTDA) system adopted the leakage light ahead of the pump pulse to generate Rayleigh back-scattering light.
Shang Qiufeng +3 more
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Micromachines, 2023 In this paper, a novel microwave photonic filter (MPF) based on a single longitudinal mode Brillouin laser achieved by parity time (PT) symmetry mode selection is proposed, and its unparalleled ultra-narrow bandwidth as low as to sub-kHz together with ...
Jiaxin Hou +8 more
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Valley Hall effect in disordered monolayer MoS2 from first principles [PDF]
, 2015 Electrons in certain two-dimensional crystals possess a pseudospin degree of freedom associated with the existence of two inequivalent valleys in the Brillouin zone.
Olsen, Thomas, Souza, Ivo
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Research on the Cable Sag On-line Monitoring Using Spontaneous Brillouin Scattering
Guangtongxin yanjiu, 2023 To improve transmission line load capacity and prevent power grid accidents, an online sag monitoring system for overhead transmission lines based on spontaneous Brillouin scattering is designed using the principles of Brillouin scattering and coherent ...
LI Xiao-juan +4 more
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Non-Local Effects in Brillouin Optical Time-Domain Analysis Sensors
Applied Sciences, 2017 Brillouin optical time-domain analysis (BOTDA) sensors have great potential to provide distributed measurements of temperature and strain over large structures with high spatial resolution and measurement precision.
Haritz Iribas +4 more
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