Practical spot size definition for single higher-order rectangular-mode laser beams

1981 ◽  
Vol 20 (10) ◽  
pp. 1728 ◽  
Author(s):  
James T. Luxon ◽  
David E. Parker
Keyword(s):  
Spot Size ◽  
Higher Order ◽  
Laser Beams ◽  
Mode Laser

Waist location and Rayleigh range for higher-order mode laser beams

1984 ◽  
Vol 23 (13) ◽  
pp. 2088 ◽  
Author(s):  
James T. Luxon ◽  
David E. Parker ◽  
John Karkheck
Keyword(s):  
Higher Order ◽  
Laser Beams ◽  
Order Mode ◽  
Mode Laser ◽  
Rayleigh Range ◽  
Higher Order Mode

An alternative approach to determine the spot-size of a multi-mode laser beam and its application to diode laser beams

Pramana ◽  
1999 ◽  
Vol 53 (2) ◽  
pp. 307-319 ◽  
Author(s):  
Rakesh Kapoor ◽  
PK Mukhopadhyay ◽  
Jogy George ◽  
SK Sharma
Keyword(s):  
Laser Beam ◽  
Diode Laser ◽  
Spot Size ◽  
Laser Beams ◽  
Mode Laser ◽  
Alternative Approach ◽  
Multi Mode

scholarly journals Relativistic-ponderomotive effects on cross-focusing of hollow Gaussian laser beams in plasma

2015 ◽  
Vol 33 (4) ◽  
pp. 755-763 ◽  
Author(s):  
Prerana Sharma
Keyword(s):  
High Power ◽  
Collisionless Plasma ◽  
Spot Size ◽  
Higher Order ◽  
Laser Beams ◽  
Effective Dielectric Constant ◽  
Power Laser ◽  
Critical Curves ◽  
Higher Order Modes ◽  
Ponderomotive Nonlinearity

AbstractThe present work aims to study the influence of relativistic–ponderomotive effects on cross-focusing of two co-propagating high-power hollow Gaussian laser beams [high-power laser beams (HGLBs)] in collisionless plasma. The effective dielectric constant has been derived on account of relativistic–ponderomotive nonlinearity. The phenomenon of cross-focusing for higher-order modes of HGLB is compared for the case when only relativistic nonlinearity is operative in the system and it is seen that the relativistic–ponderomotive effects make the focusing much stronger and relatively faster. The critical curves for various order of HGLB is discussed and compared with the case when only ponderomotive nonlinearity is present and it reveals that in the case of relativistic–ponderomotive case the spot size reduces effectively. The higher-order modes of propagation of HGLB are also found to be governed by the parameter of another propagating HGLB. The present study is useful in determining the propagation dynamics of HGLB.

Combined influence of axial electron temperature and exponential plasma density ramp on the self-focusing of a chirped laser in plasma

2020 ◽  
Vol 75 (7) ◽  
pp. 671-675
Author(s):  
Niti Kant ◽  
Vishal Thakur
Keyword(s):  
Electron Temperature ◽  
Pulse Laser ◽  
Plasma Density ◽  
Beam Width ◽  
Spot Size ◽  
Higher Order ◽  
The Self ◽  
Chirped Pulse ◽  
Self Focusing ◽  
Paraxial Ray

AbstractAn analysis of the self-focusing of highly intense chirped pulse laser under exponential plasma density ramp with higher order value of axial electron temperature has been done. Beam width parameter is derived by using paraxial ray approximation and then solved numerically. It is seen that self-focusing of chirped pulse laser is intensely affected by the higher order values of axial electron temperature. Further, influence of exponential plasma density ramp is studied and it is concluded that self-focusing of laser enhances and occurs earlier. On the other hand defocusing of beam reduces to the great extent. It is noticed that the laser spot size reduces significantly under joint influence of the density ramp and the axial electron temperature. Present analysis may be useful for the analysis of quantum dots, the laser induced fusion and etc.

scholarly journals Self-Focusing of Hermite-Cosh-Gaussian Laser Beams in Plasma under Density Transition

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Manzoor Ahmad Wani ◽  
Niti Kant
Keyword(s):  
Laser Beam ◽  
Plasma Density ◽  
Focal Spot ◽  
Beam Width ◽  
Spot Size ◽  
Laser Beams ◽  
Equation Approach ◽  
Focal Spot Size ◽  
Self Focusing ◽  
Small Spot

Self-focusing of Hermite-Cosh-Gaussian (HChG) laser beam in plasma under density transition has been discussed here. The field distribution in the medium is expressed in terms of beam-width parameters and decentered parameter. The differential equations for the beam-width parameters are established by a parabolic wave equation approach under paraxial approximation. To overcome the defocusing, localized upward plasma density ramp is considered, so that the laser beam is focused on a small spot size. Plasma density ramp plays an important role in reducing the defocusing effect and maintaining the focal spot size up to several Rayleigh lengths. To discuss the nature of self-focusing, the behaviour of beam-width parameters with dimensionless distance of propagation for various values of decentered parameters is examined by numerical estimates. The results are presented graphically and the effect of plasma density ramp and decentered parameter on self-focusing of the beams has been discussed.

scholarly journals The investigation of the features optical vortices focusing by ring gratings with the variable height using high-performance computer systems

2021 ◽  
Vol 2086 (1) ◽  
pp. 012166
Author(s):  
D A Savelyev
Keyword(s):  
High Performance ◽  
Focal Spot ◽  
Fdtd Method ◽  
Spot Size ◽  
Laser Beams ◽  
Optical Vortices ◽  
Focal Spot Size ◽  
Near Zone ◽  
High Performance Computer ◽  
Difference Time

Abstract The diffraction of vortex laser beams with circular polarization by ring gratings with the variable height was investigated in this paper. Modelling of near zone diffraction is numerically investigated by the finite difference time domain (FDTD) method. The changes in the length size of the light needle and focal spot size are shown depending on the type of the ring grating.

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