Zernike expansions for non-Kolmogorov turbulence

Glenn D. Boreman, Christopher Dainty
1996 Optical Society of America. Journal A: Optics, Image Science, and Vision  
We investigate the expression of non-Kolmogorov turbulence in terms of Zernike polynomials. Increasing the power-law exponent of the three-dimensional phase power spectrum from 2 to 4 results in a higher proportion of wave-front energy being contained in the tilt components. Closed-form expressions are given for the variances of the Zernike coefficients in this range. For exponents greater than 4 a von Kármán spectrum is used to compute the variances numerically as a function of exponent for
more » ... of exponent for different outer-scale lengths. We find in this range that the Zernike-coefficient variances depend more strongly on outer scale than on exponent and that longer outer-scale lengths lead to more energy in the tilt terms. The scaling of Zernike-coefficient variances with pupil diameter is an explicit function of the exponent.
doi:10.1364/josaa.13.000517 fatcat:2u4idnwmr5h7zpwma7rnvlajnm