Multi-deformable mirror control method based on separation mode control and optimization algorithm

Abstract

The invention relates to a multi-deformable mirror control method based on separation mode control and an optimization algorithm. By utilizing an influence function and a wavefront distortion mode of a deformable mirror, a control response equation used for optimizing an interference signal and a deformable mirror driving signal by adopting the optimization algorithm mode is established, and a wavefront distortion mode required to be corrected and correcting value are reasonably allocated for each deformable mirror. When the optimization algorithm is executed, target light distribution is taken as an evaluation function, the evaluation function and light beam quality are taken as the same criterion, and closed-loop control is carried out on each deformable mirror by adopting the light beam quality evaluation method, so that light beam criterion reaches up to the extreme value and effective control on the multi-deformable mirror is realized. The multi-deformable mirror control method disclosed by the invention has a simple system structure, the correction mode of each deformable mirror can be reasonably distributed, a wavefront correction stroke is effectively increased by adopting the existing deformable mirror manufacturing technology, and the multi-deformable mirror control method disclosed by the invention has expandability.

Description

technical field [0001] The invention relates to a control method for a multi-deformable mirror, in particular to a control method for a multi-deformable mirror based on separation mode control and an optimization algorithm, which is suitable for wavefront distortion correction in the fields of laser application technology and the like. Background technique [0002] In fields such as laser application technology, good beam quality is one of the main goals pursued. For example, in fields that require the use of high-power lasers, such as laser cutting and processing, and inertial confinement fusion (ICF), lasers are usually required to have better beam quality, and laser transmission is required to overcome the effect of atmospheric turbulence in laser-atmospheric communications. , all of the above can be realized through wavefront phase correction, the core technology of adaptive optics. In the development of these fields, the demand for deformation of deformable mirrors is ...

AI Technical Summary

Problems solved by technology

However, limited by the existing manufacturing technology, the large stroke and high spatial resolution of the deformable mirror cannot be satisfied at the same time.

To this end, people have studied the control technology of double deformable mirrors and even multi-deformable mirrors. In 2004, Thomas Weyrauch et al. proposed a multi-deformable mirror control technology based on the Stochastic Parallel Gradient Descent (SPGD) algorithm (see Thomas Weyrauch, Mikhail A .Vorontsov, Leonid Beresnev and Ling Liu, Atmospheric compensation over a 2.3km propagation path with a multi-conjugate (piston-MEMS / modal DM) adaptive system, Proc.of SPIE Vol.5562.P73-82), 2005 Hu Shijie et al A limited correction algorithm for adaptive optical aberrations proposed by double deformable mirrors (see Hu Shijie, Xu Bing, Wu Jian, Jiang Wenhan, Research on Aberration Decoupling of Double Deformable Mirror Adaptive Optics Systems, Acta Optics Sinica, p1687-1692), but the above The shortcomings of the existing methods are mainly reflected in: the method proposed by Thomas Weyrauch et al. does not consider the coupling problem that the two deformable mirrors will produce when correcting the wavefront distortion, which may make the corrected results worse; although the limited correction algorithm It can effectively avoid coupling when the two deformable mirrors correct aberrations, but it is necessary to use a Hartmann-Shack wavefront sensor to measure the slope of the wavefront to be corrected, which increases the complexity of the system, and requires the driver arrangement of the two deformable mirrors to be the same. It needs to be optimally matched with the sub-aperture of the Hartmann-Shack wavefront sensor. In some applications where the wavefront distortion cannot be effectively measured, this method is not applicable

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