Large Aperture Off-Axis Aspherical Segment Test Using Refraction and Diffraction Mixed Compensation Based on Computer Generated Hologram

被引：2

作者：

Huang Ya ^{[1
,2
]}

Wang Fengpu ^{[1
,2
]}

Li Xinnan ^{[1
,2
]}

Chen Zhe ^{[1
,2
]}

Li Bo ^{[1
,2
]}

Xu Chen ^{[1
,2
]}

Cao Ting ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Natl Astron Observ, Nanjing 210042, Jiangsu, Peoples R China

[2] Nanjing Inst Astron Opt & Technol, CAS Key Lab Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China

来源：

ACTA OPTICA SINICA | 2022年 / 42卷 / 12期

关键词：

measurement; interferometry; off-axis aspheric surface; computer-generated hologram; 30 m telescope; refraction and diffraction mixed compensation;

D O I：

10.3788/AOS202242.1212004

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper, a refraction and diffraction mixed compensation test optical path based on computergenerated hologram (CGH) has been proposed, and the combination of the CGH and aplanatic lens is realized to measure the off-axis segment in null test with focal reducing. The total length has been reduced to 1/4 to 1/8 of that of the conventional method. And the adjustment sensitivity of the small focus ratio segment has been improved. The distortion ratio of the interferogram of the large off-axis segment has been optimized from 12. 5 to 1. 25. The segments with different off-axis distances can be measured rapidly with high precision by replacing different computer-generated holograms and keeping every elements in place. The method is used to complete the processing and testing of a Phi 330 mm off-axis trial mirror, and the root mean square (RMS) value of the test surface figure is 0.0290 lambda (lambda is wavelength). The RMS value of the test surface figure is reduced to 0. 0267 lambda, by calibrating the aplanatic lens using a standard spherical mirror.

引用

页数：11

共 21 条

[1] Measurement of aspheric mirror segments using Fizeau interferometry with CGH correction [J].