25 October 2004 Comparison of wavefront sensing with the Shack-Hartmann and pyramid sensors
Author Affiliations +
Abstract
The Shack-Hartmann wavefront sensor operates by subdividing the complex field in the aperture plane of the telescope with a lenslet array and forming low resolution images of the object. An alternative wavefront sensing scheme can be derived from placing a lenslet array at the focal plane of the aperture and forming low resolution images of the aperture. This arrangement can be viewed as the generalisation of the pyramid sensor and enables direct comparisons of the pyramid sensor with the Shack-Hartmann sensor. In particular, in this paper the performance of the reconstructor of the two sensors is investigated. Simulation results demonstrate that the lenslet array at the focal plane has equivalent performance to the Shack-Hartmann sensor in open loop when no modulation is applied to the lenslet array. However, when the array is modulated in a manner akin to the pyramid sensor, subdivision at the focal plane provides a significantly better wavefront estimate than the Shack-Hartmann sensor.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Richard M. Clare, Richard M. Clare, Richard G. Lane, Richard G. Lane, } "Comparison of wavefront sensing with the Shack-Hartmann and pyramid sensors", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.550986; https://doi.org/10.1117/12.550986
PROCEEDINGS
12 PAGES


SHARE
RELATED CONTENT

AO for ELTs: How much margin for innovation?
Proceedings of SPIE (July 06 2004)
Is there need of any modulation in the pyramid wavefront...
Proceedings of SPIE (February 06 2003)
Design and manufacture of a large-aperture wavefront sensor
Proceedings of SPIE (October 11 2004)
Novel wavefront sensor for interferometry
Proceedings of SPIE (February 20 2003)
Resolution limits in imaging LADAR systems
Proceedings of SPIE (April 11 2004)

Back to Top