Thermal blooming of repetitively pulsed laser beams

Wallace, James; Lilly, J. Q.

doi:10.1364/josa.64.001651

Cited by 28 publications

(5 citation statements)

References 6 publications

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“…One of the first studies of this subject seems to be due to Kelley (1965) and concerns the nonlinear self-focusing of optical beams. Other examples are provided by Wallace & Lilly (1974), Lilly & Miller (1977) who analyse the propagation and blooming of pulsed laser beams in the atmosphere. Ulrich (1975) gives a general review of the numerical techniques and principal results obtained in this domain.…”

Section: Introductionmentioning

confidence: 99%

Numerical solution of wave scattering problems in the parabolic approximation

Candel

1979

J. Fluid Mech.

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A numerical analysis of two-dimensional wave scattering problems is performed. The treatment relies on the parabolic approximation and provides the forward scattered wave field. Two problems are considered in particular: (i) the scattering of plane waves by a cylindrical inhomogeneity of uniform refraction index, (ii) the scattering of plane waves by a viscous core vortex. The structure of the scattered field is examined in detail and the numerical solutions of the two problems are compared to analytical results obtained in the Born approximation and interpreted according to the method of smooth perturbation.

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Section: Introductionmentioning

confidence: 99%

Numerical solution of wave scattering problems in the parabolic approximation

Candel

1979

J. Fluid Mech.

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“…At z=5km, all distributions are almost the same because there is overlapping [5] . At z=10km, overlapping ceases for the case of Np=2, so thermal blooming is very weak.…”

Section: The Influence Of the Pulse-repetition Ratementioning

confidence: 96%

“…For repetitively pulsed lasers, the time dependence of the irradiance at z = 0 is given by [5] Proc. of SPIE Vol.…”

Section: The Relation Between Index Of Refraction and The Densitymentioning

confidence: 99%

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Transient thermal blooming of collimated multi-pulse laser propagation in atmosphere

Liao¹,

Liu²,

Gao

2011

SPIE Proceedings

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This paper describes the contents of a general "four-dimensional" computer code for the transient thermal blooming of multi-pulse laser beam propagation. The solutions of the scalar wave equation in Fresnel approximation and the hydrodynamic equations are obtained by means of the discrete Fourier transform method. Based upon the scalar wave equation and the equations of hydrodynamics, the paper makes a model for collimated multi-pulse laser, simulates the transient thermal blooming numerically, and gives the laser beams irradiance distribution by changing respectively the value of the propagation distance, the pulse-repetition rate, the power, and the time. Besides, we simulate the thermal blooming of cw in order to make a contrast with multi-pulse laser. The results show multi-pulse lasers minimize thermal-blooming; if the pulse-repetition rate decreases, thermal blooming decrease, and the quality of the beam is better.Keyword list: Laser propagation in atmosphere; transient thermal blooming; multi-pulse; numerical simulation 1.INTRODUCTIONThe research of High Energy Laser (HEL) propagation in atmosphere is becoming a hotspot, due to its potential application in military affairs. HEL is not only affected by the linear effects [1] , including the absorption of atmospheric molecule, scattering and atmospheric turbulance, but also affected by nonlinear effects. Thermal blooming is one of the most serious nonlinear problems when the laser propagates in atmosphere and, consequently, developing the thermal blooming research is propitious to the application and the development of HEL [2] .

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“…The electric field is taken to be of the form E = A(x,y,z) exp (iknz -az/2) , (1) where x and y are the coordinates transverse to the propagation direction z, a is the absorption coefficient, n is the constant index of refraction in the atmosphere, and k is the wave number.…”

Section: Theoretical Formulationmentioning

confidence: 99%

New Method For Numerical Simulation Of Atmospheric Turbulence

Wallace

Gebhardt

1986

SPIE Proceedings

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A new method is described for the numerical simulation of atmospheric turbulence effects on optical propagation. The method is based on a convolution approach which offers improved mathematical accuracy and convenience for numerical implementation, as compared with the more commonly used Fourier synthesis technique. Random phase screens generated with the new method are shown to have the correct r5/3 dependence for the phase structure function for all separations r within the specified domain of validity. Typical results are also presented which show the use of the numerical turbulence simulation model in wave optics code calculations of laser beam propagation through the atmosphere.

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Thermal blooming of repetitively pulsed laser beams

Cited by 28 publications

References 6 publications

Numerical solution of wave scattering problems in the parabolic approximation

Numerical solution of wave scattering problems in the parabolic approximation

Transient thermal blooming of collimated multi-pulse laser propagation in atmosphere

New Method For Numerical Simulation Of Atmospheric Turbulence

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