By Vladimir P. Lukin, Boris V. Fortes

ISBN-10: 0819443379

ISBN-13: 9780819443373

A result of vast software of adaptive optical platforms, an knowing 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 distinctive 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 version

- advent

- Mathematical Simulation of Laser Beam Propagation within the surroundings

- Modeling an Adaptive Optics process

- Adaptive Imaging

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

- A Reference Beacon as a Key component to an Adaptive Optics procedure

- end

- Index

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Extra info for Adaptive Beaming and Imaging in the Turbulent Atmosphere

Example text

15) Bl     Ql    F    exp  i V   d 2  . 16) J n21 ( R)  J ( V )  (1) m l cos(2m) J 2 m ( V )(1  m 0 ) . 17) where  is the temporal frequency. Substituting Bl () from Eq. 17) into Eq. 18) which can be used to generate random temporal realizations of the expansion coefficients. However, a difficulty arises that is due to correlation of the expansion coefficients in terms of the Zernike polynomials. The correlation matrix is nondiagonal, so we cannot generate coefficients as statistically independent random numbers.

26) Here, the parameter N refers to the number of division points in the interval ; I,J are the points at which the value of the function is selected when calculating the integral sum. Here we consider A(I,J) as terms of the N-sized sample of a random parameter A(L,M), where L,M is a point inside the interval . This approximation is valid if the integral  is small and the statistics of the random field A() vary insignificantly within its limits. Calculation of the integral in the numerator of the right-hand side of Eq.

11) is closer to the diffraction solution than with any other boundary condition. Thus, the estimates of the correction efficiency can be considered to be estimates of the limiting efficiency (if the efficiency criterion is chosen so that its value reaches the maximum at diffraction-limited propagation). As distortions increase, such a reference wave differs increasingly more from the optimal one. The problem of finding the optimal boundary conditions for the reference beam is not considered here because in practice it is usually impossible to create a reference wave with given boundary conditions.

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


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