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Wide field adaptive optics laboratory demonstration with closed-loop tomographic control.

Anne Costille¹, Cyril Petit, Jean-Marc Conan

¹ONERA, DOTA-HRA, B.P. 72, 29 avenue de la Division Leclerc, 92322 Chatillon Cedex, France. anne.costille@obs.ujf-grenoble.fr

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|March 9, 2010

Summary

Researchers validated multi-conjugate adaptive optics (MCAO) and laser tomography adaptive optics (LTAO) using linear quadratic Gaussian (LQG) control. LQG control significantly enhanced performance in LTAO experiments, showing promise for future telescopes.

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Area of Science:

Astronomy and Astrophysics
Optical Engineering
Control Systems

Background:

Adaptive optics (AO) systems are crucial for overcoming atmospheric turbulence in astronomical observations.
Wide Field Adaptive Optics (WFAO) aims to correct aberrations over larger fields of view.
Previous control approaches for MCAO and LTAO faced limitations in performance and real-time implementation.

Purpose of the Study:

To experimentally validate Multi-Conjugate Adaptive Optics (MCAO) and Laser Tomography Adaptive Optics (LTAO) concepts.
To evaluate the performance of a Linear Quadratic Gaussian (LQG) control approach for WFAO systems.
To demonstrate the feasibility of LQG control for tomographic reconstruction in LTAO.

Main Methods:

Development and utilization of the HOMER laboratory bench at ONERA for WFAO research.
Implementation of a Linear Quadratic Gaussian (LQG) control strategy for MCAO and LTAO.
Calibration and model identification procedures for the experimental setup.
Closed-loop experimental testing and comparison with end-to-end simulations.

Main Results:

Successful experimental validation of MCAO and LTAO concepts using LQG control.
Demonstrated significant performance gains in LTAO closed-loop operations attributed to LQG control.
Experimental results showed strong consistency with end-to-end simulations.
Observed robustness of the LQG control performance despite experimental uncertainties.

Conclusions:

LQG control provides a viable and effective approach for advanced adaptive optics systems like MCAO and LTAO.
The HOMER bench serves as a valuable platform for validating WFAO concepts.
These findings represent a critical first step towards developing instruments for Very Large Telescopes (VLT) and Extremely Large Telescopes (ELT).