A model-based approach to wave front sensorless adaptive optics

Martin J. Booth

doi:10.1117/12.681617

29 August 2006 A model-based approach to wave front sensorless adaptive optics

Martin J. Booth

Proceedings Volume 6306, Advanced Wavefront Control: Methods, Devices, and Applications IV; 63060M (2006) https://doi.org/10.1117/12.681617
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

One of the simplest implementations of adaptive optics requires an adaptive correction element and a single pinhole photodetector. Aberration measurement is performed by the sequential application of chosen aberrations using the correction element and appropriate processing of the corresponding photodetector intensity measurements in order to maximise the detector signal. These wave front sensorless adaptive optics systems have been demonstrated in many applications, which have included confocal microscopy, intra-cavity aberration correction for lasers, fibre coupling and optical trapping. The maximisation procedure, the choice of the applied aberrations and the processing of the intensity measurements must be optimised if the system is to work efficiently. In many practical systems aberrations can be accurately represented by a small number of orthogonal modes. We present a model of such systems and show that they have properties that facilitate algorithm design, in particular a well defined maximum and spherical symmetry. Through mathematical reasoning these properties can be used to calculate optimum parameters, rather than obtaining them in an empirical manner. The model leads to a direct maximisation algorithm that has much better convergence properties than search algorithms and permits the measurement of N modes with only N+1 intensity measurements. We also describe a general scheme for such wave front sensorless algorithms and relate various methods to this general scheme.

Citation Download Citation

Martin J. Booth "A model-based approach to wave front sensorless adaptive optics", Proc. SPIE 6306, Advanced Wavefront Control: Methods, Devices, and Applications IV, 63060M (29 August 2006); https://doi.org/10.1117/12.681617

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available