Propagation characteristics of collimated, pulsed laser beams through an absorbing atmosphere

Ulrich, Peter B.; Wallace, James

doi:10.1364/josa.63.000008

Cited by 25 publications

(8 citation statements)

References 9 publications

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“…For a T,, of two we note that the peak intensity located off-axis is nearly equal to the undistorted centerline intensity. Ulrich and Wallace [45] have reported numerical solutions for the transient thermal distortion for both the long-term and short-term distortion. They pointed out that the numerical results agree with the analytic results in the extreme time regimes.…”

Section: A/ai = 1 -(1af/ai) Z / Z Pmentioning

confidence: 99%

“…Several authors have addressed this problem. The short term thermal distortion of a collimated pulsed laser beam was analyzed numerically by Ulrich and Wallace [45]. Aitken et al [47] developed computer code modeling that included focusing and Ulrich [46] showed computer-code results which demonstrated the concept of saturation of energy deliverable.…”

Section: Influence Of Focusing On Transient Bloomingmentioning

confidence: 99%

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High-power laser propagation: Thermal blooming

Smith¹

1977

Proc. IEEE

161

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Absrmcr-This paper presents a tutorial review of the self-induced thermal distortion of laser radiation propagating in absorbing media.The distortion of the laser beam is the result of heating of the path by absorption of a small fraction of the laser beam power by the medium which changes the index of refraction and therefore distorts the beam. Thermal-blooming effects can limit the laser powen which can be effectively propagated through the atmosphere, or in media which absorb laser power such as industrial or laboratory environments, Muid or gas cells, or even laser active media themselves. In this paper, we review the steadystate thermal blooming of CW beams including laboratory-simulation experiments and computer-code results. The thermal distortion of pulsed-laser radiation is also covered including single-pulse thermal distortion and the distortion of a train of laser pulses In these discussions, we derive and identify the scaling laws and determine the important nondimensional parameters so that the results can be interpreted and applied to other propagation conditions. The thermal-blooming problem can be complicated by a number of circumstances, such as the geometry of the propagation path, and these special cases are also reviewed. Among those covered a r e : the influence of stagnation zones, transonic flow, the kinetic cooling effect, molecular and aerosol absorption and relaxation, laser-beam jitter, and atmospheric turbulence. In addition, the techniques utilized to minimize blooming, such as laser-beam shaping, and adaptivmptics phase conection, are also discussed.

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Section: A/ai = 1 -(1af/ai) Z / Z Pmentioning

confidence: 99%

Section: Influence Of Focusing On Transient Bloomingmentioning

confidence: 99%

High-power laser propagation: Thermal blooming

Smith¹

1977

Proc. IEEE

161

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“…The sequence of relations, Equations (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) to (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23), when performed for k = 1,2,...K, comprises the first half of the fractional step method. It should be noted that all quantities are complex and that complex arithmetic is implied throughout.…”

Section: (4-17)mentioning

confidence: 99%

An Analysis of Mathematical Transformations and a Comparison of Numerical Techniques for Computation of High-Energy CW Laser Propagation in an Inhomogeneous Medium

Breaux¹

1974

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“…Many researchers (2,3,4) have made detail researchs on thermal blooming. In our paper, thermal blooming in atmosheric laser propagation is studied using Fast Fourier Transformation(FFT).…”

Section: Introdutionmentioning

confidence: 99%

<title>Numerical simulation of thermal blooming in atmospheric laser propagation</title>

Chen

et al. 1993

Atmospheric Propagation and Remote Sensing II

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Laser propagating through atmosphere will be distored by thermal blooming and turbulence. Thermal blooming in atmosheric laser propagation is studied using Fast Founcr Transform(FFT). Variation of steady state thermal blooming with laser power and propagation distance are shown and power threshold is also calculated. Time-dependent thermal blooming effects with and without wind are investigated. Comparisions between simulated and experimental results reach good agreements.

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Propagation characteristics of collimated, pulsed laser beams through an absorbing atmosphere

Cited by 25 publications

References 9 publications

High-power laser propagation: Thermal blooming

High-power laser propagation: Thermal blooming

An Analysis of Mathematical Transformations and a Comparison of Numerical Techniques for Computation of High-Energy CW Laser Propagation in an Inhomogeneous Medium

<title>Numerical simulation of thermal blooming in atmospheric laser propagation</title>

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