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New modal wave-front sensor: a theoretical analysis

2000; Optica Publishing Group; Volume: 17; Issue: 6 Linguagem: Inglês

10.1364/josaa.17.001098

1520-8532

Mark A. A. Neil, Martin J. Booth, Tony Wilson,

Optical Systems and Laser Technology

We present a new design of a modal wave-front sensor capable of measuring directly the Zernike components of an aberrated wave front. The sensor shows good linearity for small aberration amplitudes and is particularly suitable for integration in a closed-loop adaptive system. We introduce a sensitivity matrix and show that it is sparse, and we derive conditions specifying which elements are necessarily zero. The sensor may be temporally or spatially multiplexed, the former using a reconfigurable optical element, the latter using a numerically optimized binary optical element. Different optimization schemes are discussed, and their performance is compared.