Optical design and fabrication of the off-axis paraboloid and ellipsoidal mirrors of beamline for synchrotron radiation biological spectroscopic experiments

Changxin Zhou; Zhijin Ma; Jing-Hong Shao; Xiangming Gu; Wu-Ming Liu

doi:10.1117/12.138708

20 January 1993 Optical design and fabrication of the off-axis paraboloid and ellipsoidal mirrors of beamline for synchrotron radiation biological spectroscopic experiments

Changxin Zhou, Zhijin Ma, Jing-Hong Shao, Xiangming Gu, Wu-Ming Liu

Author Affiliations +

Proceedings Volume 1740, Optics for High-Brightness Synchrotron Radiation Beamlines; (1993) https://doi.org/10.1117/12.138708
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

At present beamline 3B1 in Synchrotron Radiation Lab. of Beijing Electron Position Collider has been set up for soft X-ray photolithography experiment. 3B1B beamline branched from beamline 3B1 operates at VUV-VIS for biological spectroscopic experiment. This paper describes design and fabrication on optical system of 3B1B. The features of optical system design is to adopt an off-axis paraboloid mirror which focuses light beam from synchrotron radiation source on entrance slit of Vm-562 vacuum monochromator and homogeneously circular spot appears on focal plane. An ellipsoidal mirror is used to focus spot on exit slit onto sample. It is very difficult to fabrication two aspherical mirror, it is 600 mm from axis, focal length f equals 315.7, dimension 40 X 100 mm², length of long axis of the ellipsoidal mirror is 1200 mm and that of short axis is 848.52 mm. Al+MgF₂ layer is coated on the surface mirror. We make use of special fabrication technology and testing method for mirrors and get satisfied with results. Figure error of two mirrors: diameter of circle of diffusion is less than 0.1 mm and surface roughness is less than 1 nm RMS. As it operates at 140 - 400 nm, incidence angle (theta) equals 45 degree(s), reflectivity of the mirror is better than 75%. These conditions meet requirements for biological spectroscopic experiments in the beamline.

Citation Download Citation

Changxin Zhou, Zhijin Ma, Jing-Hong Shao, Xiangming Gu, and Wu-Ming Liu "Optical design and fabrication of the off-axis paraboloid and ellipsoidal mirrors of beamline for synchrotron radiation biological spectroscopic experiments", Proc. SPIE 1740, Optics for High-Brightness Synchrotron Radiation Beamlines, (20 January 1993); https://doi.org/10.1117/12.138708

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KEYWORDS

Mirrors

Off axis mirrors

Synchrotron radiation

Reflectivity

Optics manufacturing

Polishing

Spectroscopy

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