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

By Vladimir P. Lukin, Boris V. Fortes

As a result of the broad software of adaptive optical structures, an realizing of optical wave propagation in randomly inhomogeneous media has turn into crucial, and several other numerical versions of person AOS parts and of effective correction algorithms were constructed. This monograph includes unique descriptions of the mathematical experiments that have been designed and performed in the course of greater than a decade's worthy of research.

Contents

- Preface to the English variation

- creation

- Mathematical Simulation of Laser Beam Propagation within the surroundings

- Modeling an Adaptive Optics method

- Adaptive Imaging

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

- A Reference Beacon as a Key section of an Adaptive Optics approach

- end

- Index

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Additional info for Adaptive Beaming and Imaging in the Turbulent Atmosphere (SPIE Press Monograph Vol. PM109)

Sample text

Lens transformation of coordinates, known as Talanov transformation, has been used by several authors [2, 39, 51-54] to transform the problem of propagation of a beam focused by an aperture with one Fresnel number into the same problem but with an aperture with a different Fresnel number. During numerical solution of the problem of paraxial beam propagation, this transformation allows the computational expense to be decreased markedly, particularly in the case of large Fresnel numbers (small wave parameters).

For L / D  8, the value of 1 increases very slowly toward the theoretical limit, whereas parameters  3 ,  6 , and 10 decrease at approximately the same speed, thus showing the poor approximation of high-order aberrations. Thus, using the Fourier transform method to simulate a turbulent phase screen with the power spectrum, we obtain greatly underestimated values of tilt fluctuations (tilt corresponds to the first-order polynomials Z 2 and Z 3 ) and somewhat underestimated values for fluctuations of quadratic aberrations.

8, pp. 210–222, 1995. I . Tatarskii, Wave Propagation in the Turbulent Atmosphere, Nauka, Moscow, 1967. A. Ishimaru, Wave Propagation and Scattering in Random Media, Academic Press, New York, 1977. W. , Laser Beam Propagation in the Atmosphere, SpringerVerlag, Berlin-Heidelberg-New York, 1978. L. B. W. Strohben, Springer-Verlag, Berlin-Heidelberg-New York, 1978. I. Marchuk, Methods of Numerical Mathematics, Nauka, Moscow, 1980. A. Konyaev, “Numerical solution of diffraction problems on a random phase screen,” in Abstracts of Reports at the V Conference on Laser Beam Propagation in the Atmosphere, pp.

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