Fabrication and test of a wide-field multilayer mirror for imaging the magnetosphere

Lawrence Shing; Richard C. Catura; Yam T. Chiu; Bob M. Robinson

doi:10.1117/12.147634

7 July 1993 Fabrication and test of a wide-field multilayer mirror for imaging the magnetosphere

Lawrence Shing, Richard C. Catura, Yam T. Chiu, Bob M. Robinson

Proceedings Volume 2008, Instrumentation for Magnetospheric Imagery II; (1993) https://doi.org/10.1117/12.147634
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

We have developed techniques for depositing a uniform multilayer on a highly curved mirror surface. The multilayer was designed for normal incidence reflection of the emission line of He II at a wavelength of 304 angstroms. The mirror was of a design suitable for broad field imaging of the resonantly scattered solar He line from He+ in the earth's plasmasphere. A spherical proto-type mirror was chosen for the tests having a radius of curvature of 9.8 cm (focal length of 4.9 cm) and a diameter of 14 cm. The sagitta for this highly curved mirror is 2.8 cm and the angle that the mirror surface makes with its axis varies from 90 deg to 45 deg, center to edge. This poses a challenge to produce a multilayer that is uniform in response over the mirror's surface. For normal incidence reflection of 304 angstroms photons, molybdenum and silicon were chosen as the multilayer materials. A vacuum sputtering process, involving planar magnetrons, was used to fabricate the multilayers. Details of the deposition techniques, results of subsequent testing and ways of further improving the uniformity will be presented.

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Lawrence Shing, Richard C. Catura, Yam T. Chiu, and Bob M. Robinson "Fabrication and test of a wide-field multilayer mirror for imaging the magnetosphere", Proc. SPIE 2008, Instrumentation for Magnetospheric Imagery II, (7 July 1993); https://doi.org/10.1117/12.147634

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