Determination Of The Inner Scale Of Atmospheric Turbulence Through Laser Beam Wandering

1987 ◽  
Author(s):  
A. Consortini ◽  
K. A. O'donnell ◽  
G. Conforti
Keyword(s):  
Laser Beam ◽  
Atmospheric Turbulence ◽  
Beam Wandering ◽  
Inner Scale

scholarly journals Experimental determination of thermal turbulence effects on a propagating laser beam

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Sphumelele C. Ndlovu ◽  
Naven Chetty
Keyword(s):  
Laser Beam ◽  
Atmospheric Turbulence ◽  
Laser Beams ◽  
Reliable Technique ◽  
Thermal Turbulence ◽  
Turbulence Effects ◽  
The Military ◽  
Atmospheric Systems ◽  
Turbulence Parameters

AbstractThe effect of turbulence on propagating laser beams has been a subject of interest since the evolution of lasers back in 1959. In this work, an inexpensive and reliable technique for producing interferograms using a point diffraction interferometer (PDI) was considered to experimentally study the turbulence effects on a laser beam propagating through air. The formed interferograms from a propagating beamwere observed and digitally processed to study the strength of atmospheric turbulence. This technique was found to be sensitive enough to detect changes in applied temperature with distance between the simulated turbulence and laser path. These preliminary findings indicated that we can use a PDI method to detect and localise atmospheric turbulence parameters. Such parameters are very important for use in the military (defence laser weapons) and this is vital for South Africa (SA) since it has natural resources, is involved in peace keeping and mediation for other countries, and hence must have a strong defence system that will be able to locate, detect and destroy incoming missiles and other threatening atmospheric systems in order to protect its environment and avoid the initiation of countermeasures on its land.

A-Si:H Ambipolar Diffusion Length and Effective Lifetime Measured by Flying Spot Technique (FST)

1991 ◽  
Vol 219 ◽  
Author(s):  
M. Vieira ◽  
R. Martins ◽  
E. Fortunato ◽  
F. Soares ◽  
L. Guimaraes
Keyword(s):  
Laser Beam ◽  
Transient Analysis ◽  
Diffusion Length ◽  
Transport Equations ◽  
Ambipolar Diffusion ◽  
Schottky Barriers ◽  
Effective Lifetime ◽  
Asymmetrical Distribution ◽  
Flying Spot

ABSTRACTThe determination of the ambipolar diffusion length, L*, and the effective lifetime, τ*, in p/i and a-Si:H Schottky barriers (ITO/p/a-Si:H/Al-Si; Cr/a-Si:H/Cr/Ag) have been determined by Flying Spot Technique, FST. This technique consists in the transient analysis of the photocurrent/photopotential induced by a laser beam that moves perpendicularly to the structure with a constant motion ratio, at different velocities. Taking into account the competition between the diffusion/drift velocities of the excess carriers and the velocity of the flying spot, it is possible to solve the transport equations and to compute separately L* and τ*, from the asymmetrical distribution responses.

scholarly journals Turbulence-induced persistence in laser beam wandering

2015 ◽  
Vol 40 (13) ◽  
pp. 3145 ◽  
Author(s):  
Luciano Zunino ◽  
Damián Gulich ◽  
Gustavo Funes ◽  
Darío G. Pérez
Keyword(s):  
Laser Beam ◽  
Beam Wandering

In-process determination of laser beam absorption coefficient for laser-assisted turning processes

2017 ◽  
Vol 92 (5-8) ◽  
pp. 2929-2938 ◽  
Author(s):  
Mostafa M. Kashani ◽  
Mohammad R. Movahhedy ◽  
Mohammad T. Ahmadian ◽  
Reza S. Razavi
Keyword(s):  
Absorption Coefficient ◽  
Laser Beam ◽  
Laser Assisted Turning

Determination of the adaptive mirror’s parameters for the phase correction of laser beam passed through an airway

2021 ◽  
Author(s):  
Vyacheslav Blagonravov ◽  
Andrey Vereshchagin ◽  
Mikhail Glukhov ◽  
Daniil Guk ◽  
Mikhail Koltygin ◽  
...  
Keyword(s):  
Laser Beam ◽  
Phase Correction

scholarly journals In situ determination of the critical straining condition for solidification cracking during laser beam welding

Procedia CIRP ◽  
2020 ◽  
Vol 94 ◽  
pp. 666-670
Author(s):  
Nasim Bakir ◽  
Andrey Gumenyuk ◽  
Vitaly Pavlov ◽  
Sergey Volvenko ◽  
Michael Rethmeier
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
Solidification Cracking
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