A z-invariant Rayleigh beacon wavefront sensor

Details A z-invariant Rayleigh beacon wavefront sensor A z-invariant Rayleigh beacon wavefront sensor

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.327..949r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 327, Issue 3, pp. 949-954.

Physics

Optics

1

Instrumentation: Adaptive Optics, Instrumentation: Miscellaneous

Scientific paper

An innovative concept of wavefront sensing for Rayleigh beacons is introduced along with an example of a possible wavefront sensor. This new approach does not require the gating technique to limit the useful range of the laser source and therefore looks simpler to implement than previous Rayleigh concepts, and may additionally allow more efficient use of the photons emitted by the Rayleigh beacon. Our technique is based upon an optical element in the focal plane area whose section does not change for the conjugation of different ranges from the telescope aperture, hence the name z-invariant. The wavefront sensor shown here is an example of this new class. It is a compact pupil-plane wavefront sensor and as such allows for a layer-oriented configuration. It is shown that its sensitivity, while higher than usual gating approaches, is far from the possible limits leading us to speculate that other z-invariant wavefront sensors can reach much larger efficiencies.

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