The Study Of Technology Of The Adaptive Optics For All Path Aberration Correction And Double Deformable Mirrors Adaptive Optics

The principle and workings of the adaptive optics system for all path aberration correction and the double deformable mirrors (DMs) adaptive optics system are studied theoretically, numerical simulation and experiment are also conducted in this dissertation.Adaptive Optics guarantees the beam quality of laser projecting system, atmospheric turbulence compensation, correction of any disturbance and fabrication error. But conventional adaptive optics system can only correction one of them. The adaptive optics system for all path aberration correction is the new way to fulfill the correction of them all.The adaptive optics system for all path aberration correction is a new direction of adaptive optics technology. Apart from the all path aberration correction, highly integration and reliability lie in this system. Based on the previous research, the principle, error resulting from the principle and workings of the adaptive optics system for all path aberration correction are deeply studied theoretically and experimentally.According to the theory of wavefront propagating in optics medium, the principle of the adaptive optics system for all-path aberration correction was analyzed in detail, and the principle error of this system was clear, which is that the aberration on aim is the aberration of the retroreflector array. Based on the principle and the principle error of this system, two kinds of workings of adaptive optics for all path aberration correction are proposed, one is calibraiting two wavefront sensors using two normal parallel beam respectively, the other is calibrating two wavefront sensors using one of two normal parallel beam. While using the first working, the farfield on aim is the aberration of the normal parallel beam after adaptive optics correct the aberration. While using the second working, the farfield on aim is the the abeeration of the retroreflector array after adaptive optics correct the aberration. According to the operation of two working, we think that the second wording is the best method.The residual error after the adaptive optics correct the aberration is connected with the aberration of the retroreflector array, so the aberration was analyzed in this dissertation. The main factor of aberration of the retroreflector array is the all angle error, which will make the aberration of the retroreflector array be high order. In order to reduce the aberrtion of the retroreflector array, we must control the all angle error of the single retroreflector. In this dissertation simulation and experiment of the aberration of the retroreflector array were achived. The result indicates while the all angle error of the single retroreflector is 1", the aberration of the retroreflector array can be neglected.Meanwhile the error matching between the retroreflector array and wavefront sensor was analyzed in this dissertation. In order to guarantee the precision of the wvefront sensor detecting wavefront and the effect of the system, the error must be zero between the retroreflector array and wavefront sensor.Then the data fusion methods for single wavefront corrector AO system and double wavefront correctors AO system are analyzed theoretically. The result indicates that the direction slope data fusion can be use in the single wavefront corrector AO system for all-path aberration correction, and the data fusion can not be use in two wavefront correctors AO system for all-path aberration correction. At last a close-loop experiment of the system is realized successfully.Now in many fields, such as high power laser, correction of aberration of human being's eyes, and Inertial Confinement Fusion(ICF), large scale low order aberration and small scale high order aberration may lie in the aberration to be corrected by adaptive optics system simultaneously. This kind of aberration requires the deformable mirror in adaptive optics have large stroke and high spatial frequency simultaneously. But it is very difficult that the the deformable mirror in adaptive optics have large stroke and high spatial frequency simultaneously. So double DMs adaptive optics technology was proposed in this dissertation, in which one DM's stroke is large and another's spatial frequency is high. Double DMs adaptive optics technology aims to correct the aberration with large scale low order aberration and small scale high order aberration simultaneously. It is not necessary that there are large stroke and high spatial frequency in single DM. Two kinds of decoupling algorithm of two DMs, that is separating model coefficient correction algorithm and confined correction algorithm, are presented. Two kinds of algorithms are deduced in detail, and numerical simulation is gived. Defocus limitation and astigmatism limitation in confined correction algorithm are simulated respectively. At last experiments were achived in this dissertation. The result indicates that two deformable mirrors can correct the large scale low order aberration and high order aberration respectively.