Alignment technology of off-axis Cassegrain optical system
A high-precision alignment method of off-axis Cassegrain optical system was provided.According to the assembly difficulties of off-axis paraboloid primary mirror,the bonding form and area are determined by theoretical calcu-lation and simulation analysis.The self-alignment detection is performed by ainterferometer and a plane mirror to com-plete the micro-stress of assembly of primary mirror.Combined with the structural characteristics of the system,the re-lationship between the primary mirror position attitude and the mechanical reference is established by measuring the opti-mal surface shape of the primary mirror,so that the primary mirror optical axis is consistent with the mechanical refer-ence.By analyzing the relationship between the amount of secondary mirror misalignment and the system wavefront aber-ration,the system wavefront aberration correction is realized by adjusting the secondary mirror by six degrees of free-dom.The surface shape change after the primary mirror is bonded and assembled is less than 5％,and the wave aberra-tion after the system aligned is better than 0.055λ.The data meets the design index requirements.
off-axis optical systemalignment of main mirrorcomputer-aided alignmentwave aberration
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