THREE-DIMENSIONAL SIMULATIONS OF STIMULATED BRILLOUIN SCATTERING WITH FOCUSED GAUSSIAN BEAMS

1996 ◽  
Vol 05 (02) ◽  
pp. 387-408 ◽  
Author(s):  
T.R. MOORE ◽  
R.W. BOYD
Keyword(s):  
Pump Wave ◽  
Focal Point ◽  
Brillouin Scattering ◽  
Three Dimensional ◽  
Stokes Wave ◽  
Gaussian Beams ◽  
Spontaneous Noise ◽  
Brillouin Gain ◽  
Dimensional Simulation ◽  
Stimulated Brillouin

We report on a detailed investigation of the process of SBS with focused Gaussian beams via a three-dimensional simulation of the SBS process that includes spontaneous noise. We show that spontaneous noise present at points other than where the initiation of SBS occurs does not significantly affect the Stokes wave. The effects on the Stokes beam of modes not present in the pump wave (nonconjugate modes) are investigated and it is found that the phase of a given Stokes mode is affected by the presence of other modes, a process termed phase pulling. We also show that for a focused Gaussian beam the Brillouin gain parameter does not increase linearly with increased pump power once SBS threshold is reached; rather, above threshold the SBS process resembles a reverse saturable absorber for the pump wave at any point. between the entrance to the medium and the focal point of the pump beam.

scholarly journals Stimulated Brillouin Scattering Enhanced Fibers for Narrow-Band Filtering by Tailoring Brillouin Gain Spectrum

2017 ◽  
Vol 9 (6) ◽  
pp. 1-11
Author(s):  
Zhen Guo ◽  
Changjian Ke ◽  
Chen Xing ◽  
Yibo Zhong ◽  
Guo Yin ◽  
...  
Keyword(s):  
Narrow Band ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Gain Spectrum ◽  
Brillouin Gain ◽  
Stimulated Brillouin

Characterisation of Liquid Brillouin Media at 532 nm

1997 ◽  
Vol 06 (01) ◽  
pp. 69-79 ◽  
Author(s):  
D. C. Jones
Keyword(s):  
Brillouin Scattering ◽  
Optical Breakdown ◽  
Gain Coefficient ◽  
High Gain ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Phase Conjugate ◽  
Brillouin Gain ◽  
Stimulated Brillouin ◽  
532 Nm

A number of transparent liquids have been evaluated for use in stimulated Brillouin scattering at 532 nm. Measurements were made of frequency shift, SBS threshold, reflectivity and optical breakdown properties. It was found that the alkanes, and in particular n-pentane, performed well and measurements were made of Brillouin gain coefficient and phonon lifetimes. It is suggested that these liquids are promising candidates for use in self-pumped phase conjugate mirrors, high gain Brillouin amplifiers and four-wave mixing mirrors.

Enhanced levels of stimulated Brillouin reflectivity from non-Maxwellian plasmas

2007 ◽  
Vol 73 (2) ◽  
pp. 159-166 ◽  
Author(s):  
M.S. BAWA'ANEH ◽  
T.J.M. BOYD
Keyword(s):  
Experimental Data ◽  
Acoustic Noise ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Temperature Gradients ◽  
Target Plasma ◽  
Ion Acoustic ◽  
Brillouin Gain ◽  
Stimulated Brillouin

Abstract.A model that counts for temperature gradients in the target plasma, which leads to higher ion acoustic noise and enhanced levels of stimulated Brillouin scattering (SBS) gain and SBS reflectivity, has been adopted. Enhanced Brillouin gain leading to higher SBS reflectivity levels has been computed for non-homogeneous, non-Maxwellian plasmas. SBS reflectivity levels obtained are higher than those predicted by linear convective gain theory by several orders of magnitude and coincide with the high values of experimental data known in literature, which could not be interpreted by the linear convective gain theory.

scholarly journals Stimulated Brillouin gain spectroscopy in a confined spatio-temporal domain (30 μm, 170 ns)

2020 ◽  
Vol 89 (3) ◽  
pp. 30701
Author(s):  
Lionel Djadaojee ◽  
Albane Douillet ◽  
Jules Grucker
Keyword(s):  
Brillouin Scattering ◽  
Test Sample ◽  
Gain Spectrum ◽  
Acoustic Properties ◽  
Transient Phenomena ◽  
Temporal Domain ◽  
Spatio Temporal ◽  
Brillouin Gain ◽  
Stimulated Brillouin ◽  
Different Sources

The Brillouin gain spectrum of a test sample (liquid acetone at room temperature) on scales simultaneously confined in space (~30 μm) and time (~170 ns) is reported. This is done using a pulsed stimulated Brillouin scattering gain spectrometer in a θ ≈ 90° crossing beam configuration. After having identified and corrected for different sources of background signals, we obtained a Brillouin gain spectrum allowing an accurate measurement (MHz range) of the Brillouin frequency (few GHz). This is of interest for probing acoustic properties of transparent media subjected to repetitive fast transient phenomena on small length scales.

Study on All-Optical Slow-Light Delays of Stimulated Brillouin Scattering in Photonic Crystal Fibers

2012 ◽  
Vol 571 ◽  
pp. 296-299
Author(s):  
Chun Lian Hu ◽  
Shang Lin Hou ◽  
Qian Kong ◽  
Yan Jun Liu ◽  
Yong Zhao Xu
Keyword(s):  
Photonic Crystal ◽  
Time Delay ◽  
Slow Light ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Stokes Wave ◽  
Pulse Delay ◽  
Small Core ◽  
Coupled Equations ◽  
Stimulated Brillouin

The Photonic crystal fiber-based stimulated Brillouin scattering coupled equations are solved by the method of fourth-order Runge-Kutta formula and characteristics. Pulse delay and broadening of the Stokes pulse are studied in different PCFs under the same Stokes wave intensity and the characteristics in the small core PCFs for different ratio are investigated. The simulation results show that small core PCF has better time delay and the smaller the ratio is, the larger the time delay is, and the maximum pulse broadening factor is accordingly larger.

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