Results 81 to 90 of about 25,400 (165)

Characterization of stimulated Brillouin scattering in a circular-core two-mode fiber using optical time-domain analysis

Optics Express, 2013
We show characterization of stimulated Brillouin scattering (SBS) in a circular-core two-mode fiber (c-TMF) using Brillouin optical time-domain analysis (BOTDA) with a pulsed pump and a counterpropagating continuous wave probe. By using two free-space mode combiners (FSMCs), we can launch any combination of spatial modes into both ends of the c-TMF ...
An, Li, Qian, Hu, William, Shieh
openaire   +2 more sources

Influence of Pump Light on LP₀₁ and LP₁₁ Modes in Few-Mode Fiber Brillouin Optical Time Domain Reflectometry

Photonics
The quality of pump pulse in few-mode-fiber Brillouin optical time domain reflectometry (FMF-BOTDR) is vital for the spontaneous Brillouin scattering of modes LP01 and LP11 because it is the comprehensive effect of the main laser linewidth and pulse ...
Yunqi Hao, Yiliang Han, Weitong Liao, Miao Miao, Kun Yang   +4 more
doaj   +1 more source

Discrimination of Temperature and Strain in Brillouin Optical Time Domain Analysis Using a Multicore Optical Fiber

Sensors, 2018
Brillouin optical time domain analysis is the sensing of temperature and strain changes along an optical fiber by measuring the frequency shift changes of Brillouin backscattering.
Mohamed A. S. Zaghloul, Mohan Wang, Giovanni Milione, Ming-Jun Li, Shenping Li, Yue-Kai Huang, Ting Wang, Kevin P. Chen   +7 more
doaj   +1 more source

Influence of layer thickness on time domain Brillouin scattering oscillation amplitude in multilayer films

Journal of Applied Physics
This paper investigates the impact of a sample structure on the amplitude of time-domain Brillouin scattering (TDBS) oscillations using silicon wafers with different oxide layer thicknesses as an example. According to the calculation results based on transfer matrix theory and Green’s function, along with experimental results, we discovered that the ...
Enrui Zhang, Hongyuan Zhao, Zhiming Geng, Xuejun Yan, Xiaodong Xu, Jiayu Dai   +5 more
openaire   +1 more source

Quantification of ultrafast nonlinear photothermal and photoacoustic effects in molecular thin films via time-domain Brillouin scattering

The Journal of Chemical Physics
Improving the efficiency of photothermal (PT) therapies and photoacoustic (PA) imaging at the microscopic scale hinges on developing multiphoton-absorbing photothermal molecules or contrast agents that operate in the near-infrared (NIR) range. These advanced agents or molecules will enable excitation with NIR lasers, in an improved transparency range ...
Valentin Cherruault, Franck Camerel, Julien Morin, Amédée Triadon, Nicolas Godin, Ronan Lefort, Olivier Mongin, Jean-François Bergamini, Antoine Vacher, Mark G. Humphrey, Maciej Lorenc, Frederic Paul, Thomas Pezeril   +12 more
openaire   +4 more sources

BGS Distribution Deformation in BOTDR Induced by Self-Phase Modulation

Photonic Sensors
We report the numerical and experimental studies of the two-dimensional Brillouin gain spectrum (BGS) distribution deformation induced by the self-phase modulation in the Brillouin optical time domain reflectometry (BOTDR) with a 20.6 km sensing distance.
Haoting Wu, Wencun Guo, Zixuan Zhong, Guolu Yin, Tao Liu, Tao Zhu   +5 more
doaj   +1 more source

Effects of Chromatic Dispersion on BOTDA Sensor

Photonics
This study investigates the influence of chromatic dispersion on the performance of Brillouin optical time-domain analysis (BOTDA) sensors, particularly under high-pump-power conditions, where nonlinear effects become significant.
Qingwen Hou, Mingjun Kuang, Jindong Wang, Jianping Guo, Zhengjun Wei   +4 more
doaj   +1 more source

Time-domain Brillouin scattering assisted by diffraction gratings

Time-domain Brillouin scattering assisted by diffraction gratings
Absorption of ultrashort laser pulses in a metallic grating deposited on a transparent sample launches coherent compression/dilatation acoustic pulses in directions of different orders of acoustic diffraction. Their propagation is detected by delayed laser pulses, which are also diffracted by the metallic grating, through the measurement of the ...
openaire  

Towards lasing systems for distributed fibre sensing. [PDF]

Light Sci Appl
Thévenaz L.
europepmc   +1 more source

Charge-Acoustic Phonon Coupling Determined Carrier Transport Properties in FA_xMA_1-xPbBr₃ Perovskite Single Crystals. [PDF]

Adv Sci (Weinh)
Zhang W, Zou Z, Wu T, Xiao Z, Feng D, Zhong J, Zou X, Zhao N.   +7 more
europepmc   +1 more source