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Bringing the Visible Universe into Focus with Robo-AO

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Distributed modal command for a two-deformable-mirror adaptive optics system.

R Conan¹, C Bradley, P Hampton

¹University of Victoria, Engineering Lab Wing A212, P.O. Box 3055 STN CSC, Victoria, British Columbia, Canada, V8W 3P6. rconan@uvic.ca

|June 21, 2007

Summary

Future adaptive optics (AO) systems may use multiple deformable mirrors (DMs) for specialized corrections. This study presents a modal basis method reducing DM stroke by factors of 3 and 9 for improved performance.

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Area of Science:

Optical Engineering
Astronomy
Adaptive Optics

Background:

Current adaptive optics (AO) systems typically use a single deformable mirror (DM).
Future AO systems may employ multiple DMs, each optimized for specific spatial frequency ranges.
Optimizing DM control is crucial for enhancing AO system performance.

Purpose of the Study:

To develop a method for deriving orthogonal modal bases for multi-DM systems.
To enable specialized spatial frequency correction by individual DMs.
To reduce the required stroke (actuation range) of each DM.

Main Methods:

Derivation of DM modal bases from DM influence functions.
Ensuring modal bases are orthogonal to modes restricting DM correction to specific spatial frequencies.
Testing the derived modal bases on a woofer-tweeter test bench.

Main Results:

Demonstrated reduction in root-mean-square (rms) stroke amplitude for woofer DM by a factor of 3.
Demonstrated reduction in rms stroke amplitude for tweeter DM by a factor of 9.
Achieved these reductions while maintaining the same AO system performance.

Conclusions:

The presented modal basis method effectively reduces DM stroke requirements in multi-DM AO systems.
This approach allows for optimized spatial frequency correction, enhancing AO system efficiency.
The findings are validated by experimental results on a woofer-tweeter test bench.