摘要
两反望远镜的装调精度是保证系统成像质量的关键环节,目前工程上采用的装调方法仅以轴上视场的彗差为参考,无法有效保证系统全视场的成像质量。以矢量波像差理论为基础,分析了两反望远镜的像差场特性,根据失调系统的彗差场和像散场的双节点特性,提出了一种基于轴外对称视场像散调整的装调方法。以一个R-C两反望远镜为例,分析了在给定的失调状态下,分别依据轴上视场彗差调整的装调方法和提出的轴外对称视场像散调整的装调方法,开展了系统的装调实验。实验结果表明,通过调整次镜,仅将轴上视场的彗差作为装调依据,装调后的系统全视场的像散值为1.02λ,系统并未达到最佳装调状态;而利用提出的轴外对称视场像散调整的装调方法进行装调后,系统全视场的像散平均值为0.46λ,基本与理论设计值一致,结果表明,利用提出的方法有效地完成了系统的装调。
The alignment accuracy of the two-mirror telescopes is a key link to ensure the imaging quality of the system.One of the currently used alignment methods is to use the coma of the on-axis field of view(FOV)as a reference,which cannot effectively guarantee the imaging quality of the system’s entire FOV.Based on the vector wave aberration theory,the aberration field characteristics of the two-mirror telescopes is analyzed in this paper.According to the characteristics of the coma field and astigmatism field of the misalignment system,an alignment method based on the astigmatism of symmetric off-axis FOV is proposed.According to the theoretical analysis results,taking an R-C two-mirror telescope as an example,the alignment method using on-axis field coma and the off-axis symmetric field astigmatism proposed in this article were analyzed under a given initial misalignment state.A systematic simulation alignment experiment was carried out based on the method in the paper.The results showed that when the on-axis coma is zero after moving the secondary mirror,the astigmatism of the full FOV was 1.02λ,and the system did not reach the optimal alignment state.However,after the alignment using the astigmatism of off-axis symmetrical FOVs,the average astigmatism of the system’s entire FOV is 0.46λ,which is basically consistent with the theoretical design value,indicating that the method proposed in this article is effectively completed the alignment of a two-mirror telescope.
作者
王浩
张磊
WANG Hao;ZHANG Lei(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China)
出处
《激光杂志》
CAS
北大核心
2024年第11期42-47,共6页
Laser Journal
基金
吉林省教育厅科技基金(No.JJKH20210814KJ)。
关键词
两反望远镜
装调
对称视场
像散
two-mirror telescopes
alignment
symmetrical FOV
astigmatism
