New PDF release: Adaptive Beaming and Imaging in the Turbulent Atmosphere

By Vladimir P. Lukin, Boris V. Fortes

ISBN-10: 0819443379

ISBN-13: 9780819443373

As a result of vast program of adaptive optical structures, an figuring out of optical wave propagation in randomly inhomogeneous media has turn into crucial, and a number of other numerical versions of person AOS parts and of effective correction algorithms were built. This monograph comprises targeted descriptions of the mathematical experiments that have been designed and conducted in the course of greater than a decade's worthy of research.

Contents

- Preface to the English version

- advent

- Mathematical Simulation of Laser Beam Propagation within the surroundings

- Modeling an Adaptive Optics process

- Adaptive Imaging

- Minimization and part Correction of Thermal Blooming of High-Power Beams

- A Reference Beacon as a Key part of an Adaptive Optics method

- end

- Index

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Additional resources for Adaptive Beaming and Imaging in the Turbulent Atmosphere

Example text

As can be seen from this figure, turbulence moves along the wind velocity vector. Setting the direction so it does not coincide with the coordinate axis, we can obtain sufficiently long nonrecurring temporal realizations of turbulent distortions. This is possible because at every cycle along the abscissa with the duration Tx  ( N ) / Vx , the phase screen shifts along the ordinate by Dy  TxVy . The period of exact recurrence is determined by the following condition: nVyTx  mN  , where n and m are even numbers.

Lukin, Atmospheric Adaptive Optics, Nauka, Novosibirsk, 1986. 36. M. Yaglom, Statistical Hydrodynamics. Part II, Nauka, Moscow, 1967. 37. I. A. P. Jaroslavski, “Method of generation of correlated Gaussian pseudo-random numbers on a computer,” J. Com. Math. and Math. Physics, 12, pp. 1353–1357, 1972. 38. B. C. Peri, “Production and use of a lenticular Hartmann screen,” J. Opt. Soc. , 6, p. 1586, 1971. 39. A. E. Siegman, “Diffraction calculation using fast Fourier transform methods,” Proc. IEEE, 62, No.

However, it follows from the statistical independence of the real and imaginary parts that the arguments of the coefficients of the Fourier series are distributed uniformly in the interval [0; 2]. Let us consider some peculiarities connected with the fact that the process being considered is a real one. This fact is often used to obtain two phase screens as a result of a Fourier transform: one in the real part and another in the imaginary part. However, this approach is efficient only for a statistically uniform (for example, horizontal) path because only then can both screens have the same statistics.

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Adaptive Beaming and Imaging in the Turbulent Atmosphere by Vladimir P. Lukin, Boris V. Fortes


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