Wave front reconstruction using a second-order model for Shack-Hartmann wavefront sensor measurements

Troy A. Rhoadarmer

doi:10.1117/12.472370

25 June 2002 Wave front reconstruction using a second-order model for Shack-Hartmann wavefront sensor measurements

Troy A. Rhoadarmer

Proceedings Volume 4724, Laser Weapons Technology III; (2002) https://doi.org/10.1117/12.472370
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

Many adaptive optics systems rely on a Shack-Hartmann wave front sensor (WFS) coupled with a traditional least squares reconstructor to estimate the aberrations in the incident wave front. Unfortunately, the performance of this approach degrades in the presence of strong scintillation because, when there are intensity fluctuations in the wave front, the WFS does not measure the average phase gradient within each subaperture as assumed by the reconstruction algorithm. As scintillation increases, branch points in the wave front increase the disparity between what the WFS measures and what the reconstruction algorithm expects. A reconstruction algorithm is presented that attempts to mitigate the branch point problem by using a more realistic model for the Shack-Hartmann WFS measurements. Wave optics simulations over a variety of atmospheric conditions are used to compare the performance of this algorithm against a least squares reconstructor and a complex exponential reconstructor.

Citation Download Citation

Troy A. Rhoadarmer "Wave front reconstruction using a second-order model for Shack-Hartmann wavefront sensor measurements", Proc. SPIE 4724, Laser Weapons Technology III, (25 June 2002); https://doi.org/10.1117/12.472370

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