scholarly journals Mathematical Treatment of Infrared Multiphoton Dissociation Induced by Non-Uniform Non-Gaussian Laser Beam.

1991 ◽  
Vol 19 (10) ◽  
pp. 950-955
Author(s):  
Kei SUNOUCHI ◽  
Kazuo TAKEUCHI
Keyword(s):  
Laser Beam ◽  
Infrared Multiphoton Dissociation ◽  
Mathematical Treatment ◽  
Gaussian Laser Beam ◽  
Multiphoton Dissociation ◽  
Non Gaussian

scholarly journals Generalized Thermoelastic Functionally Graded on a Thin Slim Strip Non-Gaussian Laser Beam

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1094 ◽  
Author(s):  
Sayed M. Abo-Dahab ◽  
Ahmed E. Abouelregal ◽  
Marin Marin
Keyword(s):  
Laser Beam ◽  
Pulse Length ◽  
Generalized Thermoelasticity ◽  
Functionally Graded ◽  
Strong Impact ◽  
Problem Solution ◽  
Gaussian Laser Beam ◽  
Laser Parameters ◽  
Non Gaussian ◽  
The Impact

The present study utilizes the generalized thermoelasticity theory, with one thermal relaxation time (TR), to examine the thermoelastic problem of a functionally graded thin slim strip (TSS). The authors heated the plane surface bounding using a non-Gaussian laser beam with a pulse length of 2 ps. The material characteristics varied continually based on exponential functions. Moreover, the equations governing the generalized thermoelasticity for a functionally graded material (FGM) are recognized. The problem’s ideal solution was primarily obtained in the Laplace transform (LT) space. The LTs were converted numerically because of the considerable importance of the response in the transient state. For a hypothetical substance, the numerical procedures calculating the displacement, stress, temperature and strain were given. The analogous problem solution to an isotropic homogeneous material was provided by defining the parameter of non-homogeneity adequately. The obtained results were displayed using graphs to illustrate the extent to which non-homogeneity affected displacement, stress, temperature and strain. A comparison was been made between the present study and those previously obtained by others, when the new parameters vanish to show the impact of the non-homogeneity, TSS and laser parameters on the phenomenon. The results obtained indicate a significant strong impact of FGM, TSS and laser parameters.

EFFECTS OF COMBINED RADIATIVE AND CONVECTIVE HEAT TRANSFER ON TEMPERATURE BENEATH MODULATED SOURCE

2007 ◽  
Vol 21 (11) ◽  
pp. 1903-1913 ◽  
Author(s):  
KAREM BOUBAKER ◽  
M. BOUHAFS
Keyword(s):  
Heat Transfer ◽  
Analytical Solution ◽  
Laser Beam ◽  
Heat Equation ◽  
Convective Heat Transfer ◽  
Temperature Profile ◽  
Convective Heat ◽  
Calculation Method ◽  
Gaussian Laser Beam ◽  
Non Gaussian

An analytical solution is presented to the heat equation in the vicinity of a surface fluid, heated by a modulated Gaussian Laser beam and taking into account three heat transfer modes: conduction, radiation and convection. A new calculation method is performed for profiling temperature inside a surface fluid. Comparison with several experimental profiles explains some unexpected temperature profile results as non-Gaussian behaviour.

Application of Sustained off-Resonance Irradiation Infrared Multiphoton Dissociation Tandem Mass Spectrometry to the Analysis of Biomolecules

2005 ◽  
Vol 11 (5) ◽  
pp. 483-487 ◽  
Author(s):  
Göran Hübner ◽  
Catharina Crone ◽  
Buko Lindner
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Laser Beam ◽  
Pulse Sequence ◽  
Irradiation Time ◽  
Infrared Multiphoton Dissociation ◽  
Ion Cyclotron Resonance ◽  
Tandem Mass ◽  
Cyclotron Motion ◽  
Multiphoton Dissociation

A modified pulse sequence for infrared multiphoton dissociation (IRMPD) experiments on a Fourier transform ion cyclotron resonance (ICR) mass spectrometer in conjunction with sidekick trapping is presented. For IRMPD tandem mass spectrometry experiments gated trapping is normally applied. It ensures that the ions remain on-axis and, thus, cross the laser beam which is aligned on-axis in commercially available instruments. Sidekick trapping is used to capture more ions in the ICR cell in order to increase the signal intensity. However, it may lead to off-axis ion motion, which reduces or even excludes interaction with the laser beam. In this contribution, sustained off-resonance irradiation (SORI) was applied to overcome this disadvantage of sidekick trapping. SORI is normally used in conjunction with collision-induced dissociation experiments to increase the kinetic energy of the ions. Here, SORI is used to influence the cyclotron motion during the laser irradiation time, which leads to a temporary intersection of the ion trajectory with the laser beam. With this easy-to-handle experimental set-up, IRMPD of ions captured with sidekick trapping again leads to the generation of fragment ions, as is demonstrated with several biologically relevant samples like peptides, lipids and glycolipids.

scholarly journals Spatial evolution of a q-Gaussian laser beam in relativistic plasma

2010 ◽  
Vol 28 (3) ◽  
pp. 479-489 ◽  
Author(s):  
A. Sharma ◽  
I. Kourakis
Keyword(s):  
Laser Beam ◽  
Beam Profile ◽  
Relativistic Plasma ◽  
Gaussian Laser Beam ◽  
Transverse Beam ◽  
Recent Experimental Study ◽  
Gaussian Profile ◽  
Spatial Beam ◽  
Gaussian Distribution Function ◽  
Non Gaussian

AbstractIn a recent experimental study, the beam intensity profile of the Vulcan petawatt laser beam was measured; it was found that only 20% of the energy was contained within the full width at half maximum of 6.9 μm and 50% within 16 μm, suggesting a long-tailed non-Gaussian transverse beam profile. A q-Gaussian distribution function was suggested therein to reproduce this behavior. The spatial beam profile dynamics of a q-Gaussian laser beam propagating in relativistic plasma is investigated in this article. A non-paraxial theory is employed, taking into account nonlinearity via the relativistic decrease of the plasma frequency. We have studied analytically and numerically the dynamics of a relativistically guided beam and its dependence on the q-parameter. Numerical simulation results are shown to trace the dependence of the focusing length on the q-Gaussian profile.

Propagation of a Non-Gaussian Laser Beam in SELFOC Fibres

1977 ◽  
Vol 24 (11) ◽  
pp. 1141-1146
Author(s):  
V.P. Nayyar ◽  
N.K. Verma
Keyword(s):  
Laser Beam ◽  
Gaussian Laser Beam ◽  
Non Gaussian
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