Results 141 to 150 of about 25,400 (165)

Influence of pump pulse spectrum on the signal-noise-ratio of brillouin scattering in brillouin optical time domain reflectometry

Optical Fiber Technology, 2020
Abstracts The influence of pump pulse spectrum launched into the sensing fiber on the spontaneous Brillouin scattering and Brillouin Optical Time Domain Reflectometry (BOTDR) sensing system, is investigated both theoretically and experimentally. The pump pulse power spectrum is the essential factor for the Brillouin scattering from physical mechanism,
Yunqi Hao, Fengxiao Zhai, Kun Yang, Nannan Liu, Sujuan Liu   +4 more
openaire   +1 more source

Brillouin optical time-domain analysis enhanced by forward stimulated Brillouin scattering: proof-of-concept demonstration

Applied Physics Express, 2019
A distributed Brillouin optical time-domain analysis (BOTDA) sensor enhanced by forward stimulated Brillouin scattering (FSBS) based distributed Brillouin amplification (DBA) was proposed and presented. Due to co-propagating of pump and Stokes lights, the Stokes pulse is effectively amplified in front segment of fiber, resulting in flatter gain ...
Jia-Bing Lin, Xin-Hong Jia, Shi-Rong Xu, Hui-Liang Ma, Han Wu, Xi-Yang Wei   +5 more
openaire   +1 more source

Stimulated Brillouin scattering modeled through a finite difference time domain approach

SPIE Proceedings, 2004
Stimulated Brillouin scattering (SBS), in an optical fiber, is a three-wave interaction (3WI) resulting from a coupling between light and acoustic waves. In a fiber optic sensing context, SBS results from the interaction between counterpropagating pulsed and continuous fields.
Andrew E. Marble, Kellie A. Brown, Bruce G. Colpitts   +2 more
openaire   +1 more source

Generation of flat-top waveform in the time domain based on stimulated Brillouin scattering

Applied Physics B, 2007
A method of generating a flat-top waveform in the time domain based on stimulated Brillouin scattering (SBS) is proposed. The transmitted pulses are simulated with pump wavelength at 1064 nm and 532 nm, respectively, and validated in the experiment performed with the Nd:YAG seed-injected laser.
W.-L.-J. Hasi, Z.-W. Lu, S.-Jie Liu, Q. Li, G.-H. Yin, W.-M. He   +5 more
openaire   +1 more source

Stimulated Brillouin Scattering in the Time Domain at 1 nm^{-1} Wave Vector

Physical review letters
We used extreme ultraviolet (EUV) pulses to create transient gratings (TGs) with sub-100 nm spatial periodicity in a 𝛽−Ga2⁢O3 single crystal. The EUV TG launches acoustic modes parallel to the sample surface, whose dynamics were revealed via backward diffraction of a third, time-delayed, EUV pulse.
Fainozzi D., Foglia L., Khatu N. N., Masciovecchio C., Mincigrucci R., Paltanin E., Bencivenga F.   +6 more
openaire   +2 more sources

Toward Time-Domain Brillouin Scattering in Levitation

The strong light-matter interaction of plasmonic nanoparticles has sparked great interest across diverse research fields, including biological imaging, medicine, materials science, and physics. Observing acoustic vibrations of such nanoparticles has advanced the understanding of the mechanical inter- action of these particles with their local ...
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Scattering of GHz coherent acoustic phonons by silica nanoparticles in water probed with the time-domain Brillouin spectroscopy

Applied Physics Letters, 2019
Coherent acoustic phonons detected by time-domain Brillouin spectroscopy (TDBS) in a liquid medium are strongly attenuated when silica nanoparticles sediment in the liquid. The decrease in the optical signal is due to the strong acoustic scattering by silica nanoparticles whose size matches the wavelength of phonons at the frequency of the Brillouin ...
Marie-Fraise Ponge, Liwang Liu, Christophe Aristégui, Bertrand Audoin   +3 more
openaire   +1 more source

Detection of Brillouin scattering temperature signal in Brillouin optical time-domain reflectometer sensing system based on instantaneous frequency measurement technology

Optical Engineering, 2007
We present a simple and practical method for the single-ended distributed fiber temperature measurements using microwave (11-GHz) coherent detection and the instantaneous frequency measurement (IFM) technique to detect spontaneous Brillouin backscattered signal in which a specially designed rf bandpass filter at 11 GHz is used as a frequency ...
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On the importance of the optical anisotropy in the detection of coherent acoustic phonons in a time-domain Brillouin scattering experiment

Applied Physics Letters
In this perspectives paper, we discuss the role of optical anisotropy in detecting coherent acoustic phonons in a time-domain Brillouin experiment. First, we present the general theoretical background to the optical detection of acoustic phonons in a uniaxial material. We then illustrate this theory experimentally by studying highly birefringent BiFeO3
M. Lejman, G. Vaudel, V. Juvé, B. Dkhil, V. Gusev, C. Paillard, P. Ruello   +6 more
openaire   +1 more source

Out-of-plane longitudinal sound velocity in SnS₂ determined via broadband time-domain Brillouin scattering

2022
Here we report time-resolved broadband transient reflectivity measurements performed in a single crystal of SnS2. We made use of time-domain Brillouin scattering and a broadband probe to measure the out-of-plane longitudinal sound velocity vL = (2950 ± 100) m s−1, in this semiconducting two-dimensional transition metal dichalcogenide.
Cheng, Meixin, Pichugin, Kostyantyn, Maas, André, Schleberger, Marika, Sciaini, Germán   +4 more
openaire   +1 more source