Transverse mode analysis for free-space laser beams using Bayesian analysis

2021 ◽  
Vol 60 (12) ◽  
pp. 3344
Author(s):  
Peifan Liu ◽  
Jun Yan ◽  
Wei Li ◽  
Ying K. Wu
Keyword(s):  
Bayesian Analysis ◽  
Free Space ◽  
Transverse Mode ◽  
Laser Beams ◽  
Mode Analysis

Light propagation: beams and guides

Optics f2f ◽  
2018 ◽  
pp. 177-194
Author(s):  
Charles S. Adams ◽  
Ifan G. Hughes
Keyword(s):  
Free Space ◽  
Light Propagation ◽  
Laser Beams ◽  
Optical Fibres

This chapter considers the propagation of laser beams in free space and laser cavities, and light propagating in waveguides such as optical fibres.

Finite-Resistivity Effects on Rayleigh-Taylor Instability of a Stratified Plasma Including Suspended Particles

1985 ◽  
Vol 40 (8) ◽  
pp. 826-833
Author(s):  
Rajkamal Sanghvi ◽  
R. K. Chhajlani
Keyword(s):  
Magnetic Field ◽  
Kinematic Viscosity ◽  
Normal Mode Analysis ◽  
Longitudinal Mode ◽  
Transverse Mode ◽  
Suspended Particles ◽  
Wave Number ◽  
Mode Analysis ◽  
Free Boundaries ◽  
Horizontal Magnetic Field

The Rayleigh-Taylor (RT) instability of a stratified and viscid magnetoplasma including the effects of "finite-resistivity and suspended particles is investigated using normal mode analysis. The horizontal magnetic field and the viscosity of the medium are assumed to be variable. The dispersion relation, which is obtained for the general case on employing boundary conditions appropriate to the case of two free boundaries, is then specialized for the longitudinal and transverse modes. It is found that the criterion of stable stratification remains essentially unchanged and that the unstable stratification for the longitudinal mode can be stabilized for a certain wave number band, whereas the transverse mode remains unstable or all wave numbers which can be stabilized by a suitable choice of the magnetic field for vanishing resistivity. Thus, resistivity is found to have a destabilizing influence on the RT configuration. The growth rates of the unstable RT modes with the kinematic viscosity and the relaxation frequency parameter of the suspended particles have been analytically evaluated. Dust (suspended particles) tends to stabilize the configuration when the medium is considered viscid with infinite conductivity. The kinematic viscosity has a stabilizing influence on the ideal plasma modes.

scholarly journals Automated free-space beam delivery system for ultrafast laser beams in the kW regime

Procedia CIRP ◽  
2020 ◽  
Vol 94 ◽  
pp. 951-956
Author(s):  
Alexander Peter ◽  
David Brinkmeier ◽  
Matthias Buser ◽  
Volkher Onuseit ◽  
Thomas Graf
Keyword(s):  
Delivery System ◽  
Free Space ◽  
Ultrafast Laser ◽  
Laser Beams ◽  
Beam Delivery ◽  
Beam Delivery System

Effect of spin-induced magnetization and Hall current on self-gravitational instability of magnetized viscous quantum plasma

2014 ◽  
Vol 81 (2) ◽  
Author(s):  
Prerana Sharma ◽  
R. K. Chhajlani
Keyword(s):  
Gravitational Instability ◽  
Quantum Effect ◽  
Normal Mode Analysis ◽  
Longitudinal Direction ◽  
Transverse Mode ◽  
Mode Analysis ◽  
Quantum Plasma ◽  
Longitudinal Modes ◽  
Jeans Criterion ◽  
Basic Equations

The Jeans self-gravitational instability is studied for dense quantum viscous plasma with Hall term and intrinsic magnetization generated by collective electron spin. The quantum magnetohydrodynamic model is employed to formulate the basic equations of the problem. The dispersion relation is obtained using the normal mode analysis, and further reduced for both transverse and longitudinal modes of propagation. The transverse mode of propagation is found to be unaffected by the Hall term but affected by quantum effect, viscosity, and magnetization parameters. The Jeans criterion of instability in the transverse direction is modified by Alfven velocity, magnetization parameter, and quantum effect. The non-gravitating magnetized mode is obtained in the longitudinal direction, which is modified by Hall parameter and is not affected by quantum term, whereas the gravitational mode is unaffected by the magnetization parameter but affected by viscosity and quantum parameters. It is observed that the Jeans condition of instability is affected by the quantum term. The growth rate of Jeans instability is plotted for various values of magnetization, quantum, and viscosity parameters of the quantum plasma medium.

Transverse mode analysis of a laser beam by near- and far-field intensity measurements

1995 ◽  
Vol 34 (34) ◽  
pp. 7974 ◽  
Author(s):  
Antonello Cutolo ◽  
Tommaso Isernia ◽  
IIdegonda Izzo ◽  
Rocco Pierri ◽  
Luigi Zeni
Keyword(s):  
Laser Beam ◽  
Field Intensity ◽  
Transverse Mode ◽  
Mode Analysis ◽  
Far Field ◽  
Intensity Measurements

Comparative analysis of numerical methods for the mode analysis of laser beams

2013 ◽  
Vol 52 (32) ◽  
pp. 7769 ◽  
Author(s):  
Robert Brüning ◽  
Philipp Gelszinnis ◽  
Christian Schulze ◽  
Daniel Flamm ◽  
Michael Duparré
Keyword(s):  
Comparative Analysis ◽  
Numerical Methods ◽  
Laser Beams ◽  
Mode Analysis
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