Saturation and frequency weighting in adaptive control of laser beam jitter

Néstor O. Pérez Arancibia; Steve Gibson; Tsu-Chin Tsao

doi:10.1117/12.737336

11 October 2007 Saturation and frequency weighting in adaptive control of laser beam jitter

Néstor O. Pérez Arancibia, Steve Gibson, Tsu-Chin Tsao

Proceedings Volume 6709, Free-Space Laser Communications VII; 67090Q (2007) https://doi.org/10.1117/12.737336
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

In recent experimental research on adaptive control of jitter in laser beams, sufficiently high levels of high frequency sensor noise have produced high frequency spikes in the output errors. The phenomenon has been observed for both adaptive and high bandwidth linear-time-invariant (LTI) control loops. Recently, the source of the problem has been discovered to be saturation associated with the MEMS fast steering mirror used as the control actuator. Results in this paper demonstrate that the spikes in the output error are eliminated by a recently developed frequency-weighting method for the tuning signal used to determine adaptive control gains. The method places more weight on jitter in frequency ranges where large sensor noise otherwise produces the unwanted response. The frequency-weighted adaptive control loop is based on a recursive least squares lattice filter that implicitly identifies the disturbance statistics from real-time sensor data. The adaptive controller achieves both fast adaptation and true minimum variance steady state performance. Results from an experiment with a MEMS fast steering mirror used in current free space optical communications systems illustrate suppression of jitter with simultaneous multiple bandwidths produced by multiple jitter sources.

Citation Download Citation

Néstor O. Pérez Arancibia, Steve Gibson, and Tsu-Chin Tsao "Saturation and frequency weighting in adaptive control of laser beam jitter", Proc. SPIE 6709, Free-Space Laser Communications VII, 67090Q (11 October 2007); https://doi.org/10.1117/12.737336

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