Model-based aberration correction in a closed-loop wavefront-sensor-less adaptive optics system

Model-based aberration correction in a closed-loop wavefront-sensor-less adaptive optics system

Song, H.
Fraanje, R.
Schitter, G.
Kroese, H.
Vdovin, G.
Verhaegen, M.

Mechanical, Maritime and Materials Engineering

Delft Center for Systems and Control

2010-11-03

In many scientific and medical applications, such as laser systems and microscopes, wavefront-sensor-less (WFSless) adaptive optics (AO) systems are used to improve the laser beam quality or the image resolution by correcting the wavefront aberration in the optical path. The lack of direct wavefront measurement in WFSless AO systems imposes a challenge to achieve efficient aberration correction. This paper presents an aberration correction approach for WFSlss AO systems based on the model of the WFSless AO system and a small number of intensity measurements, where the model is identified from the input-output data of the WFSless AO system by black-box identification. This approach is validated in an experimental setup with 20 static aberrations having Kolmogorov spatial distributions. By correcting N = 9 Zernike modes (N is the number of aberration modes), an intensity improvement from 49% of the maximum value to 89% has been achieved in average based on N +5 = 14 intensity measurements. With the worst initial intensity, an improvement from 17% of the maximum value to 86% has been achieved based on N + 4 = 13 intensity measurements.

adaptive optics
wavefront sensing
imaging through turbid media
aberration compensation

http://resolver.tudelft.nl/uuid:8e026ec4-d088-4108-a0e0-3eee1ab158ee

https://doi.org/10.1364/OE.18.024070

Optical Society of America

1094-4087

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-23-24070

Optics Express, 18 (23), 2010

Institutional Repository

journal article

(c) 2010 Optical Society of America