Inhibition of stimulated Raman side-scattering with one-dimensional smoothing by spectral dispersion

2021 ◽  
Author(s):  
Ning Kang ◽  
Huiya Liu ◽  
shenlei zhou ◽  
Yao Zhao ◽  
An-Le Lei
Keyword(s):  
One Dimensional ◽  
Spectral Dispersion ◽  
Stimulated Raman

scholarly journals STUDY OF THE ONE-DIMENSIONAL FIBROUS PRODUCT’S COMPONENT RATIO OF UNEVENNESS AND ITS DEPENDENCE OF THE LINEAR DENSITY UNEVENNESS

2020 ◽  
pp. 15-21
Author(s):  
P. A. Sevost’yanov
Keyword(s):  
Correlation Functions ◽  
Coefficient Of Variation ◽  
Linear Density ◽  
Spectral Composition ◽  
Component Ratio ◽  
One Dimensional ◽  
Spectral Dispersion ◽  
The One ◽  
The Relationship

The article presents the results of a study of the relationship between irregularity in linear density and the proportion of components of one-dimensional fibrous products (tape, tourniquet, roving, yarn). A formula is obtained for estimating the coefficient of variation for the component fraction depending on the unevenness for the linear density and the average component fraction. The estimate allows one to predict the expected unevenness of the component share in the product based on known information about the unevenness of the components. Regularities are established and examples are given of the relationship between correlation functions and spectral dispersion densities for unevenness by linear density and component share in the product depending on the share of components, their unevenness, and the spectral composition of the unevenness.

scholarly journals STUDY OF A MATHEMATICAL MODEL FOR STIMULATED RAMAN SCATTERING

2004 ◽  
Vol 14 (02) ◽  
pp. 217-252 ◽  
Author(s):  
T. BOUCHERES ◽  
T. COLIN ◽  
B. NKONGA ◽  
B. TEXIER ◽  
A. BOURGEADE
Keyword(s):  
Raman Scattering ◽  
Maxwell Equations ◽  
Stimulated Raman Scattering ◽  
Bloch Equations ◽  
Weakly Nonlinear ◽  
One Dimensional ◽  
Small Parameters ◽  
The One ◽  
Wkb Expansion ◽  
Stimulated Raman

We study a semiclassical modelization of the interaction of a laser with a mono-atomic gas. The Maxwell equations are coupled with a three-level version of the Bloch equations. Taking into account the specificities of the laser pulse and of the gas, we introduce small parameters and a dimensionless form of the equations. To describe stimulated Raman scattering, we perform a three-scale WKB expansion in the weakly nonlinear regime of geometric optics. The limit system is of Schrödinger–Bloch type. We prove a global existence result for this system and the convergence of its solution toward the solution of the initial Maxwell–Bloch equations, as the parameter of the WKB expansion goes to 0. We put in evidence Raman instability in the one-dimensional case, both theoretically and numerically.

Saturation mechanisms of backward stimulated Raman scattering in a one-dimensional geometry

2013 ◽  
Vol 20 (10) ◽  
pp. 103103 ◽  
Author(s):  
A. Friou ◽  
D. Bénisti ◽  
L. Gremillet ◽  
E. Lefebvre ◽  
O. Morice ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
One Dimensional ◽  
Stimulated Raman

scholarly journals 2D MR Spectroscopy Combined with Prior-Knowledge Fitting Is Sensitive to HCV-Associated Cerebral Metabolic Abnormalities

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Rajakumar Nagarajan ◽  
Manoj K. Sarma ◽  
April D. Thames ◽  
Steven A. Castellon ◽  
Charles H. Hinkin ◽  
...  
Keyword(s):  
Brain Metabolism ◽  
Spectral Dimension ◽  
Resonance Spectroscopy ◽  
Neurocognitive Dysfunction ◽  
One Dimensional ◽  
Markers Of Inflammation ◽  
Low Concentrations ◽  
Spectral Dispersion ◽  
Cerebral Metabolites

There is an evidence of neurocognitive dysfunction even in the absence of advanced liver disease in chronic hepatitis C virus (HCV) infection. Brain metabolism has been investigated non-invasively using one-dimensional (1D)in vivoMagnetic Resonance Spectroscopy (MRS) over three decades. Even though highly concentrated cerebral metabolites (N-acetylaspartate, creatine, choline, glutamate/glutamine, myo-inositol) have been detected using MRS, other metabolites at low concentrations (~1–3 mM or less) including glutathione, aspartate and GABA are quite difficult to observe using 1D MRS. In order to resolve overlapping resonances from a number of metabolites, a remedy is to add a second spectral dimension to the existing 1D MRS. Localized two-dimensional correlated spectroscopy (L-COSY) has been developed over the last decade to enhance the spectral dispersion by using the second spectral dimension. We have evaluated this L-COSY technique in the frontal white/gray matter regions of 14 HCV+ (mean age of 56.2 years) and 14 HCV− (mean age of 46.6 years) subjects. Our preliminary results showed significantly increased myo-inositol and glutathione in the HCV+ compared to the HCV− subjects. Hence, glutathione and myo-inositol should be considered along with other metabolites as important markers of inflammation.

scholarly journals One-dimensional steady-state model for stimulated Raman and Brillouin backscatter processes in laser-irradiated plasmas

2020 ◽  
Vol 38 (3) ◽  
pp. 169-175
Author(s):  
Zhe Yi Ge ◽  
Guo Bo Zhang ◽  
Yan Zhao Ke ◽  
Xiao Hu Yang ◽  
Fu Yuan Wu ◽  
...  
Keyword(s):  
Steady State ◽  
Electron Density ◽  
High Efficiency ◽  
Scattered Light ◽  
State Model ◽  
Model Calculations ◽  
One Dimensional ◽  
Steady State Model ◽  
Electron Density And Temperature ◽  
Stimulated Raman

AbstractA one-dimensional steady-state model for stimulated Raman backscatter (SRS) and stimulated Brillouin backscatter (SBS) processes in laser-irradiated plasmas is presented. Based on a novel “predictor-corrector” method, the model is capable to deal with broadband scattered light and inhomogeneous plasmas, exhibiting robustness and high efficiency. Influences of the electron density and temperature on the linear gains of both SRS and SBS are investigated, which indicates that the SRS gain is more sensitive to the electron density and temperature than that of the SBS. For the low-density case, the SBS dominates the scattering process, while the SRS exhibits much higher reflectivity in the high-density case. The nonlinear saturation mechanisms and competition between SRS and SBS are included in our model by a phenomenological method. The typical anti-correlation between SRS and SBS versus electron density is reproduced in the model. Calculations of the reflectivities are qualitatively in agreement with the typical results of experiments and simulations.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

1970 ◽  
Vol 28 ◽  
pp. 478-479
Author(s):  
Teruo Someya ◽  
Jinzo Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Fields ◽  
Quantitative Study ◽  
Recent Progress ◽  
Ferroelectric Domain ◽  
Resolving Power ◽  
Surface Pattern ◽  
Crystal Surfaces ◽  
One Dimensional ◽  
Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

Structure and function of neural networks in the retina

1988 ◽  
Vol 46 ◽  
pp. 26-27
Author(s):  
Peter Sterling
Keyword(s):  
Ganglion Cells ◽  
Three Dimensional ◽  
Structure And Function ◽  
Synaptic Connections ◽  
Visual Axis ◽  
One Dimensional ◽  
Cat Retina ◽  
Ultrathin Sections ◽  
And Function ◽  
Insight Into

The synaptic connections in cat retina that link photoreceptors to ganglion cells have been analyzed quantitatively. Our approach has been to prepare serial, ultrathin sections and photograph en montage at low magnification (˜2000X) in the electron microscope. Six series, 100-300 sections long, have been prepared over the last decade. They derive from different cats but always from the same region of retina, about one degree from the center of the visual axis. The material has been analyzed by reconstructing adjacent neurons in each array and then identifying systematically the synaptic connections between arrays. Most reconstructions were done manually by tracing the outlines of processes in successive sections onto acetate sheets aligned on a cartoonist's jig. The tracings were then digitized, stacked by computer, and printed with the hidden lines removed. The results have provided rather than the usual one-dimensional account of pathways, a three-dimensional account of circuits. From this has emerged insight into the functional architecture.

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