Optimized calibration strategy for high order adaptive optics systems in closed-loop: the slope-oriented Hadamard...

Area of Science:

• Adaptive optics
• Astronomical instrumentation
• Optical engineering

Background:

• Accurate calibration of the interaction matrix is essential for adaptive optics (AO) system performance.
• High-order AO systems, with thousands of mirror modes, require efficient calibration strategies to optimize interaction matrix quality and minimize time.
• The European Extremely Large Telescope (E-ELT) necessitates advanced calibration techniques for its future operation.

Purpose of the Study:

• To propose a novel calibration scheme for high-order adaptive optics systems.
• To develop a tractable criterion for evaluating interaction matrix quality.
• To demonstrate the efficiency of the proposed method compared to existing techniques.

Main Methods:

• Development of the Slope-Oriented Hadamard calibration strategy.
• Creation of a quantifiable metric for interaction matrix quality.
• Analytical derivations and simulations to assess performance.
• Experimental validation on the SPHERE Extreme AO (XAO) system.

Main Results:

• The Slope-Oriented Hadamard strategy optimizes the defined interaction matrix quality criterion.
• The proposed method achieves a given quality level seven times faster than the classical Hadamard scheme.
• Analytical, simulation, and experimental results confirm the method's effectiveness.

Conclusions:

• The Slope-Oriented Hadamard strategy offers a significant improvement in calibration speed and efficiency for high-order AO systems.
• This novel approach is well-suited for demanding applications such as the E-ELT.
• Experimental validation confirms the practical applicability and benefits of the new calibration technique.