Measurement of telescope aberrations through atmospheric turbulence by use of phase diversity.
We conduct computer simulations of the reconstruction of a wave front at a telescope pupil with the phase-diversity method. An instantaneous wave front is reconstructed from focused and defocused specklegrams of a point star. In the wave-front reconstruction we do not fit the wave front to Zernike polynomials but retrieve the phase with a phase-unwrapping procedure. Averaging over many atmospherically perturbed wave fronts leads to the residual phase error, namely, the aberration of the telescope. The scintillation effect, nonuniformity of amplitude on a telescope pupil, is also discussed.
Baba
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Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628 Japan. nbaba@eng.hokudai.ac.jp
Mutoh
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K