Adaptive Half-Symmetric Unstable Resonator With Internal Axicon (HSURIA) Studies I: Deformable Mirror Located In The Compacted Beam Region

D. Anafi; J. M. Spinhirne

doi:10.1117/12.934200

23 August 1983 Adaptive Half-Symmetric Unstable Resonator With Internal Axicon (HSURIA) Studies I: Deformable Mirror Located In The Compacted Beam Region

D. Anafi, J. M. Spinhirne

Author Affiliations +

Proceedings Volume 0365, Adaptive Optics Systems and Technology; (1983) https://doi.org/10.1117/12.934200
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

A deformable mirror in the compacted beam region of a HSURIA (half symmetric unstable resonator with internal axicon) is used to conduct intracavity adaptive optics experiments. The gain cell is a convection cooled CO₂ electric discharge located in the compacted beam region. The closed loop performance of the resonator is optimized using multidither hillclimbing servo techniques to control the figure of the discrete actuator continuous surface deformable mirror which is driven zonally. Residual aberrations in the resonator conical optics (the w-axicon) are shown to be the dominant factor governing the mode for the open loop configuration. The extent of optimization of the resonator upon closure of the adap-tive optics control loop is determined by both the spatial frequency of the aberration with respect to the correction capability of the deformable mirror and the ability of the control to converge to the global rather than a local performance maximum. In addition to simple phase correction, mode modification by the intracavity deformable mirror must be considered as a probable response of the system especially in the presence of intracavity aberrations which are beyond the spatial frequency correction capability of the deformable mirror.

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D. Anafi and J. M. Spinhirne "Adaptive Half-Symmetric Unstable Resonator With Internal Axicon (HSURIA) Studies I: Deformable Mirror Located In The Compacted Beam Region", Proc. SPIE 0365, Adaptive Optics Systems and Technology, (23 August 1983); https://doi.org/10.1117/12.934200

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