scholarly journals Slow and Fast Lights in Metal/Dielectric Composite of Cylindrical Nanoinclusions in Passive and Active Linear Dielectric Host Matrices

2021 ◽  
Vol 66 (4) ◽  
pp. 281
Author(s):  
Y.A. Abbo
Keyword(s):  
Group Velocity ◽  
Light Pulse ◽  
Extreme Values ◽  
Small Distance ◽  
Numerical Results ◽  
Speed Of Light ◽  
Host Matrix ◽  
Dielectric Composite ◽  
Host Matrices ◽  
Dielectric Host

This paper presents theoretical discussions and computational numerical results obtained from the study of extreme values of the speed of light in metal/dielectric composite, where the cylindrical nanoinclusions are uniformly distributed in the linear dielectric host matrix. The results testify that, within our approach, at the region of anomalous dispersion, light can travel with a group velocity greater than the speed of light in vacuum. In a composite with passive host matrix, the light pulse is absorbed within a very small distance. The problem of absorption can be reduced considerably by using an active host matrix.

Improved Sol-Gel Materials for Efficient Solid State Dye Lasers

1993 ◽  
Vol 329 ◽  
Author(s):  
Michael Canva ◽  
Patrick Georges ◽  
Jean-Fran^ois Perelgritz ◽  
Alain Brun ◽  
Fréddric Chaput ◽  
...  
Keyword(s):  
Solid State ◽  
Physical Properties ◽  
Room Temperature ◽  
Sol Gel ◽  
Tunable Lasers ◽  
Optical Quality ◽  
Dye Lasers ◽  
Laser Dyes ◽  
Host Matrix ◽  
Host Matrices

AbstractPhotoresistant laser dyes were trapped in silica based xerogel host matrices to obtain solid state tunable lasers. For this purpose very dense xerogel samples with improved chemical and physical properties were prepared at room temperature by the sol-gel technology. The as-prepared materials were polished to obtain optical quality surfaces and were used as new lasing media.Lasing action of such different dyes as rhodamine, perylene and pyrromethene doping dense sol-gel matrices was demonstrated. Efficiencies of 30 % or lifetimes of more than 100,000 shots were achieved with different new ≤dye dopant/host matrix≥ couples. Their different performances are reviewed and discussed.

Dispersive properties of a fluid layer overlying a semi-infinite elastic solid*

1954 ◽  
Vol 44 (3) ◽  
pp. 493-512
Author(s):  
Ivan Tolstoy
Keyword(s):  
Elastic Body ◽  
Group Velocity ◽  
Normal Mode ◽  
Fundamental Mode ◽  
Fluid Layer ◽  
Elastic Solid ◽  
Numerical Results ◽  
Stoneley Wave ◽  
Wave Velocities ◽  
Minimum Group

Abstract The dispersive properties of waves propagating in a system consisting of a fluid layer overlying a semi-infinite elastic body are investigated by means of new formulas for the group velocity. The distribution of stationary values of the group velocity is examined in the light of these formulas and of numerical results. Also it is shown that the minimum group velocity of the fundamental mode may belong either to the normal-mode branch or to the Stoneley-wave branch, depending on the contrast in wave velocities between the two media.

scholarly journals Dilation of Time Dilation

2017 ◽  
Vol 9 (6) ◽  
pp. 67
Author(s):  
Tadeusz Wajda
Keyword(s):  
Light Pulse ◽  
Michelson Interferometer ◽  
Time Dilation ◽  
Constant Time ◽  
Theory Of Relativity ◽  
Speed Of Light ◽  
Time Intervals ◽  
Interference Fringes ◽  
Fundamental Error ◽  
Transportation Speed

The study addresses the issue of the so-called time dilation in the sense of the origin of its creation and the physical existence.Based on the work of Lorentz, who the lack of displacement of interference fringes in the Michelson interferometer explained wrongly with, shortening one arm of the interferometer, I propose the construction of the light pulse clock, in which to measure the rate of the passage of time is used constancy speed of light in vacuum.Light clock, the construction of which is described in the paper, stationary in relation to the ether, will measure constant time intervals. The same clock transported, will slow down the pace of his walk as a function of transportation speed v and that is a novelty, will slow depending on its orientation relative to the direction of motion. Light clock transported transversely with respect to the stationary clock will slow gamma times, transported lengthwise will slow gamma to the second power.Basing on the obtained dependences I maintain that time dilation defined in the theory of relativity (SR) as the slowing of the lapse of time, does not physically exist and identification the varying pace of walk clock with the pace of lapse of time I consider a fundamental error resulting from the postulates of this theory.

Negative group velocity of a light pulse in cesium vapour

2002 ◽  
Vol 32 (7) ◽  
pp. 567-569 ◽  
Author(s):  
A M Akulshin ◽  
A Cimmino ◽  
G I Opat
Keyword(s):  
Group Velocity ◽  
Light Pulse ◽  
Negative Group ◽  
Negative Group Velocity

Group velocity of the light pulse in an open V-type system

Optik ◽  
2007 ◽  
Vol 118 (4) ◽  
pp. 163-167 ◽  
Author(s):  
Jingjuan Li ◽  
Xijun Fan ◽  
Shufen Tian ◽  
Chengpu Liu ◽  
Shangqing Gong ◽  
...  
Keyword(s):  
Group Velocity ◽  
Light Pulse ◽  
Type System

Application of Linearized Morison Load in Pipe Lay Stinger Design

2008 ◽  
Author(s):  
Riaan van ‘t Veer
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Current Velocity ◽  
Extreme Values ◽  
Numerical Results ◽  
Analysis Time ◽  
Ship Motions ◽  
Hydrodynamic Analysis ◽  
Response Amplitude Operators ◽  
Nonlinear Time Domain

This paper presents numerical results of ship motions and global stinger loads through a combined hydrodynamic analysis of a pipe lay vessel with submerged stinger. The results of nonlinear time domain simulations are compared to those obtained through linearization of the Morison load on the slender stinger elements. Through linearization, an iterative frequency domain solution scheme is developed reducing analysis time significantly. Response amplitude operators in operating and limiting sea states are shown, including the influence of current velocity. Through nonlinear time domain simulations insight is obtained on the distribution and magnitude of the extreme values.

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