Study On The Principle And Experiment Of The Holographic Correction Of Aberrated Primary Mirror

Holography applied to correct aberrations of the primary mirror of a telescope is one of the most promising technologies for the development of future ultra-large aperture and lightweight space optical system. It has been widely concerned by researchers around the world.Based on the principle of holography, the holographic correction technology for the aberration of the primary mirror of a telescope was analyzed and experimented in this dissertation. It is shown that near diffraction-limited performance can be obtained by setting up a system for the recording of a hologram and correction of aberrations. The work in this dissertation will offer a theoretical and technical support for the further research and manufacture of large aperture membrane mirrors for future space optical systems.Contents in this dissertation are as follows:The mechanics of holographic correction for the aberrations of the optical imaging systems are analyzed based on the principle of holography. The principle of holography correction of the aberrated refractor and reflector are also analyzed.Then some different experimental systems for holographic correction of aberrated primary mirror have been described and analyzed. The surface errors and aberrations of the low quality glass spherical mirror can be corrected in these systems. The field of view and the usable bandwidth of the telescope are analyzed briefly. Furthermore, some methods are proposed for the evaluation of aberration correction results.Finally, an experimental system for the holographic correction of a glass spherical primary mirror with a low optical quality in 200mm-aperture was set up. An image hologram of the aberrated mirror was recorded and reconstructed by the same wavelength as recording from a distant object. By testing the surface error before correction of the mirror and the interferogram of the reconstructed reference beam and the original reference beam after correction,comparing the size of the optical system's focal spot and the images of a resolution test chart through the optical imaging system before and after correction, the effect of correction is analyzed. The experimental results have validated the feasibility of holographic technology for the aberration correction of the primary mirror of a telescope.