Spatial distribution of temperature rise induced by a Gaussian laser beam

1979 ◽  
Author(s):  
Melvin Lax
Keyword(s):  
Spatial Distribution ◽  
Laser Beam ◽  
Temperature Rise ◽  
Gaussian Laser Beam

Laser Heating of Substrate by Multi-Beam Irradiation

1992 ◽  
Vol 279 ◽  
Author(s):  
Y. F. Lu
Keyword(s):  
Heat Flow ◽  
Laser Beam ◽  
Temperature Profile ◽  
Temperature Rise ◽  
Laser Heating ◽  
Temperature Profiles ◽  
Beam Irradiation ◽  
Gaussian Laser Beam ◽  
Beam Laser ◽  
Flow Intensity

ABSTRACTA general model is derived for computing the temperature profile induced by multi-beam laser irradiation in a semi-infinite substrate. The model is then applied to calculate 2-beam irradiation induced temperature rise in substrate. From this model, it is possibLe to calculate the temperature profile induced by multi-beam irradiation in substrate. The calculated results show that the double-Gaussian beam has advantages of narrow temperature profile and low heat flow intensity. Flatly-topped temperature profiles can be obtained by converting the Gaussian laser beam.

Numerical Solution for a Transient Temperature Distribution on a Finite Domain Due to a Dithering or Rotating Laser Beam

2013 ◽  
Vol 4 (4) ◽  
pp. 22-38
Author(s):  
Tsuwei Tan ◽  
Hong Zhou
Keyword(s):  
Temperature Distribution ◽  
Laser Beam ◽  
Temperature Rise ◽  
Maximum Temperature ◽  
Finite Domain ◽  
Transient Temperature ◽  
Gaussian Laser Beam ◽  
Maximum Temperature Rise ◽  
Transient Temperature Distribution ◽  
Spatial Dimensions

The temperature distribution due to a rotating or dithering Gaussian laser beam on a finite body is obtained numerically. The authors apply various techniques to solve the nonhomogeneous heat equation in different spatial dimensions. The authors’ approach includes the Crank-Nicolson method, the Fast Fourier Transform (FFT) method and the commercial software COMSOL. It is found that the maximum temperature rise decreases as the frequency of the rotating or dithering laser beam increases and the temperature rise induced by a rotating beam is smaller than the one induced by a dithering beam. The authors’ numerical results also provide the asymptotic behavior of the maximum temperature rise as a function of the frequency of a rotating or dithering laser beam.

Self-focusing of cosh-Gaussian laser beam in collisional plasma: effect of nonlinear absorption

2021 ◽  
Author(s):  
Naveen Gupta ◽  
Sandeep Kumar ◽  
A Gnaneshwaran ◽  
Sanjeev Kumar ◽  
Suman Choudhry
Keyword(s):  
Laser Beam ◽  
Nonlinear Absorption ◽  
Collisional Plasma ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Plasma Effect

A model of Gaussian laser beam self-trapping in optical tweezers for nonlinear particles

2021 ◽  
Vol 53 (8) ◽  
Author(s):  
Quy Ho Quang ◽  
Thanh Thai Doan ◽  
Kien Bui Xuan ◽  
Thang Nguyen Manh
Keyword(s):  
Laser Beam ◽  
Optical Tweezers ◽  
Gaussian Laser Beam ◽  
Self Trapping

Propagation of circularly polarized quadruple Gaussian laser beam in magnetoplasma

Optik ◽  
2015 ◽  
Vol 126 (24) ◽  
pp. 5710-5714 ◽  
Author(s):  
Munish Aggarwal ◽  
Shivani Vij ◽  
Niti Kant
Keyword(s):  
Laser Beam ◽  
Gaussian Laser Beam ◽  
Circularly Polarized

Photobleaching of a solid photochromic medium by a Gaussian laser beam

2002 ◽  
Vol 41 (15) ◽  
pp. 2907 ◽  
Author(s):  
Serge Caron ◽  
Roger A. Lessard ◽  
Pierre C. Roberge
Keyword(s):  
Laser Beam ◽  
Gaussian Laser Beam

Relativistic self-focusing of a rippled laser beam in a plasma

1999 ◽  
Vol 62 (4) ◽  
pp. 389-396 ◽  
Author(s):  
M. V. ASTHANA ◽  
A. GIULIETTI ◽  
DINESH VARSHNEY ◽  
M. S. SODHA
Keyword(s):  
Refractive Index ◽  
Laser Beam ◽  
The Self ◽  
Laser Beams ◽  
Radial Dependence ◽  
Main Beam ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Saturation Effects ◽  
Paraxial Ray

This paper presents an analysis of the relativistic self-focusing of a rippled Gaussian laser beam in a plasma. Considering the nonlinearity as arising owing to relativistic variation of mass, and following the WKB and paraxial-ray approximations, the phenomenon of self-focusing of rippled laser beams is studied for arbitrary magnitude of nonlinearity. Pandey et al. [Phys. Fluids82, 1221 (1990)] have shown that a small ripple on the axis of the main beam grows very rapidly with distance of propagation as compared with the self-focusing of the main beam. Based on this analogy, we have analysed relativistic self-focusing of rippled beams in plasmas. The relativistic intensities with saturation effects of nonlinearity allow the nonlinear refractive index in the paraxial regime to have a slower radial dependence, and thus the ripple extracts relatively less energy from its neighbourhood.

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