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Laboratory MCAO Test-Bed for Developing Wavefront Sensing Concepts.

A V Goncharov, J C Dainty, S Esposito

|June 6, 2009

Summary

This summary is machine-generated.

This study presents an optical test-bed for developing advanced wavefront sensing for Multi-Conjugate Adaptive Optics (MCAO) systems. The novel sensor concept shows feasibility for future Extremely Large Telescopes (ELTs).

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Area of Science:

Astronomy and Astrophysics
Optical Engineering

Background:

Future Extremely Large Telescopes (ELTs) require advanced Multi-Conjugate Adaptive Optics (MCAO) systems.
Atmospheric turbulence poses significant challenges for wavefront sensing in MCAO.

Purpose of the Study:

To describe an experimental optical bench test-bed for developing new wavefront sensing concepts for MCAO.
To resolve imaging problems associated with wavefront sensing for future MCAO systems on ELTs.

Main Methods:

An optical bench test-bed simulating a 10-m telescope at K band was developed.
The test-bed includes five reference sources, two deformable mirrors (DMs), and atmospheric phase screens.
A compact tomographic wavefront sensor with a field lenslet array was employed for MCAO control.

Main Results:

The feasibility of the wavefront sensing concept using multi-pupil imaging on a single detector was verified.
Experimental results of MCAO correction were obtained using the tomographic wavefront sensor.
Results were compared to theoretical predictions based on system parameters.

Conclusions:

The developed MCAO test-bed successfully demonstrates a novel wavefront sensing concept.
The compact tomographic wavefront sensor is feasible for MCAO systems on ELTs.
Experimental validation provides a basis for further development of MCAO technologies.