Impact of resolution in multi-conjugate adaptive optics systems using segmented mirrors

Thomas A. Corej; Jason D. Schmidt

doi:10.1117/12.823963

11 August 2009 Impact of resolution in multi-conjugate adaptive optics systems using segmented mirrors

Thomas A. Corej, Jason D. Schmidt

Proceedings Volume 7466, Advanced Wavefront Control: Methods, Devices, and Applications VII; 74660C (2009) https://doi.org/10.1117/12.823963
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

In moderate-to-strong scintillation, multi-conjugate adaptive optics (MCAO) appears promising to compensate for amplitude and phase fluctuations. In this research, a MCAO system is simulated with a segmented deformable mirror (DM) reshaping the amplitude and the second DM (continuous) flattening the phase after propagation from the segmented mirror. A Gerchberg-Saxton (GS) type algorithm is used with Fresnel propagation between DM planes. The effects of varying the phase's apparent resolution on a segmented DM in the pupil plane is investigated. Results show the mean square error in the reshaped beam decreases as D/r_o and Rytov number increase over the range of conditions tested (r_o: 0.11 m - 0.36 m). The field-estimated Strehl ratio drops precipitously when the number of subapertures is increased beyond about 36 across, using a branch-pointtolerant unwrapper, due to the presence of branch points. On the second DM, by using the mean of the phase within each subaperture before back propagating to the first DM plane (inside the GS loop), the Strehl ratio was improved 6 - 11 percent using 4 - 19 actuators across. Further a novel method of cascading segmented DMs, of increasingly higher resolution, doing amplitude reshaping followed by a continuous DM to flatten the phase is explored.

Citation Download Citation

Thomas A. Corej and Jason D. Schmidt "Impact of resolution in multi-conjugate adaptive optics systems using segmented mirrors", Proc. SPIE 7466, Advanced Wavefront Control: Methods, Devices, and Applications VII, 74660C (11 August 2009); https://doi.org/10.1117/12.823963

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