激光与光电子学进展, 2011, 48 (7): 071201, 网络出版: 2011-05-09   

斜入射法检测平面反射镜的面形误差 下载: 517次

Surface Error Measurement of Plane Mirrors Based on Oblique Incidence
作者单位
中国科学院上海应用物理研究所,上海光源, 上海 201204
摘要
为实现用小口径面形干涉仪完成对大口径光学镜面面形的检测,发展了斜入射检测方法,增大投射到待测镜上光斑的尺寸,从而增大干涉仪检测的镜面口径范围。推导了斜入射法检测平面反射镜面形的公式,并考虑了此方法可能引入的误差。对尺寸为124 mm×42 mm的平面反射镜分别在垂直和不同斜入射角条件下进行了测量,垂直入射时测得镜子工作表面面形起伏高度均方根(RMS)和峰谷(PV)值分别为16.3 nm和67.8 nm,斜入射时测得镜子工作表面的面形起伏高度RMS和PV值分别为16.8 nm和68.7 nm,相对误差分别为3%和0.9%,可以满足第三代同步辐射光束线的要求。
Abstract
In order to measure the surface shape of large aperture plane mirrors by using smaller caliber laser interferometer, oblique incidence method is developed. Thus, the spot illuminated on the tested mirror is magnified, and the size range that the interferometer can measure is much bigger. The plane mirror surface shape expression based on oblique incidence is gained, and the errors that may be introduced are concerned. And a plane mirror with size of 124 mm×42 mm is measured using vertical incidence and oblique incidence with different incidence angles. The surface height root mean square (RMS) and peak-to-valley (PV) results of the test mirror are 16.3 nm and 67.8 nm based on vertical incidence and 16.8 nm and 68.7 nm based on oblique incidence. Compared with vertical incidence measurement results, the relative error value of RMS is 3%, and the relative error value of PV is 0.9%.The result can satisfy the requirement of the third generation synchrotron radiation beam lines.
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马春桃, 罗红心, 王劼, 宋丽. 斜入射法检测平面反射镜的面形误差[J]. 激光与光电子学进展, 2011, 48(7): 071201. Ma Chuntao, Luo Hongxin, Wang Jie, Song Li. Surface Error Measurement of Plane Mirrors Based on Oblique Incidence[J]. Laser & Optoelectronics Progress, 2011, 48(7): 071201.

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