Decoupling Control Technology Of Multi-wavefront-corrector Systems

With the development of adaptive optics and its applications, both large strokesand high spatial resolutions are demanded. However, this could not be practicallyfulfilled by a single wavefront corrector, thus multi-wavefront-corrector of differenttypes working in combinations is proposed as a solution to solve this problem. Thispaper focuses on the decoupling control technique of multi-wavefront-correctorsystems, a series of theoretical and experimental researches about the technique arecarried on. The main contents include the following:Firstly, the decoupling strategy for wavefront-sensor based adaptive opticssystems is reviewed and analyzed through simulations. Then we propose a newmode decomposition decoupling control technique which incorporates theadvantages of traditional methods. The core of the new method is resetting of controlsignals, and the modification of reconstruction matrics based on slopesdecomposition is also used to get better performance. Simulation results demonstratethe proposed method improve both correction quality and coupling error suppression.Coupling coefficient is proposed to quantify the coupling error between differentwavefront correctors. An experimental system is built up, the effectiveness andlong-time stability of the proposed decoupling control algorithm is validated.Secondly, studies on the decoupling control technique for wavefront-sensor-lessadaptive optics systems are presented. A mode decomposition decoupling controltechnique is proposed to accommodate wavefront-sensor-less adaptive opticssystems. A strategy used to tuning control parameters and metrics are proposed as asolution to large aberrations. The effectiveness of the technique is validated by bothsimulation and experiment.Finally, the zonal decoupling control technology for adaptive optics systemswith wavefront-sensor is also researched. A new zonal decoupling control techniqueis proposed, which focuses on resetting the control signals and combines theadvantages of the modifications of reconstruction matrices based on slopesdecomposition. The simulation results show the new method could get betterperformance than the traditional zonal decoupling control method, and theexperiment results also demonstrate the effectiveness of the technique.