Correction of large- and small-scale wavefront aberrations in dual-loop adaptive optical system
Toporovsky V.V.1,2, Galaktionov I.V.1,2, Nikitin A.N.1, Samarkin V.V.1, Kudryashov A.V.1
1Sadovsky Institute of geosphere dynamics RAS, Moscow, Russia
2Moscow Technical University of Communications and Informatics (MTUCI), Moscow, Russia
Email: toporovskii_v@mail.ru, ilya.galaktionoff@gmail.com
An adaptive optical system with the ability to sequentially correct large- and small-scale wavefront aberrations is presented. Artificial turbulence on a laboratory bench was simulated with a fan heater. A 50 mm bimorph deformable mirror with 28 control elements to compensate for low-order phase fluctuations (defocus, astigmatism, coma, spherical aberration) and a stacked-actuator piezoelectric deformable mirror with an aperture of 78 mm and 55 actuators to suppress the influence of high-order phase fluctuations were used as wavefront correctors. Two Shack-Hartmann wavefront sensors were used to analyze the wavefront characteristics and provide closed-loop control. Keywords: piezoelectric wavefront correctors, bimorph deformable mirror, piezoactuator deformable mirror, Shack-Hartmann wavefront sensor.
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