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Zeitschriftenartikel:

H. Song, R. Fraanje, G. Schitter, H. Kroese, G. Vdovin, M. Verhaegen:
"Model-based aberration correction in a closed-loop wavefront-sensor-less adaptive optics system";
Virtual Journal for Biomedical Optics, 6 Ausgabe 1 (2011), 15 S.



Kurzfassung englisch:
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.

Erstellt aus der Publikationsdatenbank der Technischen Universitšt Wien.