Telescope phasing and ground states of solid-on-solid models.

Details Telescope phasing and ground states of solid-on-solid models. Telescope phasing and ground states of solid-on-solid models.

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jpha...23l.803r&link_type=abstract

Journal of Physics A, Vol. 23, No. 16, p. L803 - L814

Physics

Multiple-Mirror Telescopes: Image Processing

Scientific paper

Wavefront phase perturbations are a source of severe image degradation in large astronomical telescopes. This degradation can, in principle, be compensated by suitable surface corrections in a multi-mirror telescope. The authors propose an analogy between such a telescope and a solid-on-solid model for a crystal surface. Mirrors correspond to columns of atoms, and optimal phasing corresponds to a flat crystal surface. Simulation of an annealing process that gives flat crystal surfaces at low temperatures is found to provide a reliable algorithm for phasing the telescope. Annealing, suitably combined with the use of several wavelengths, avoids local minima of the effective Hamiltonian for the intensity pattern.

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