Correctability limitations imposed by spherical-wave scintillation in multi-conjugate adaptive optics

Lawton H. Lee

doi:10.1117/12.670063

28 June 2006 Correctability limitations imposed by spherical-wave scintillation in multi-conjugate adaptive optics

Lawton H. Lee

Proceedings Volume 6272, Advances in Adaptive Optics II; 62721Z (2006) https://doi.org/10.1117/12.670063
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

Spherical-wave scintillation is shown to impose multi-conjugate adaptive optics (MCAO) correctability limitations that are independent of wavefront sensing and reconstruction. Residual phase and log-amplitude variances induced by scintillation in weak turbulence are derived using (diffraction-based) diffractive MCAO spatial filters or (diffraction-ignorant) geometric MCAO proportional gains as linear open-loop control parameters. In the case of Kolmogorov turbulence, expressions involving the Rytov variance and/or weighted C_n² integrals apply. Differences in performance between diffractive MCAO and geometric MCAO resemble chromatic errors. Optimal corrections based on least squares imply irreducible performance limits that are validated by wave-optic simulations.

Citation Download Citation

Lawton H. Lee "Correctability limitations imposed by spherical-wave scintillation in multi-conjugate adaptive optics", Proc. SPIE 6272, Advances in Adaptive Optics II, 62721Z (28 June 2006); https://doi.org/10.1117/12.670063

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