Production And Evaluation Of Super-Smooth Dip-Coated Foils For High Throughput X-Ray Telescopes

L. Jalota; R. Willingale

doi:10.1117/12.942180

9 August 1988 Production And Evaluation Of Super-Smooth Dip-Coated Foils For High Throughput X-Ray Telescopes

L. Jalota, R. Willingale

Proceedings Volume 0830, Grazing Incidence Optics for Astronomical and Laboratory Applications; (1988) https://doi.org/10.1117/12.942180
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

High throughput X-ray telescopes require thin mirrors with super-smooth surfaces, typically with rms surface roughnesses of 5 A. The simple and inexpensive process of coating a suitable substrate with an acrylic lacquer to achieve a high quality surface finish is discussed. The surface roughnesses of several candidate materials, including rolled aluminium foil, polyester sheet, and diamond turned flats have been investigated. The surfaces, both before and after coating, have been examined by X-ray scattering measurements. Surface roughness in the spatial frequency range 2 - 70 mm-1 is attenuated by up to a factor of 7. Below 2 mm-1 the lacquer is unable to reduce the roughness and actually degrades the surface quality. The polyester surface has a roughness of 11 A rms in the spatial frequency range 18 - 70 mm-1 but suffers from large profile errors probably introduced by mounting the sample.

Citation Download Citation

L. Jalota and R. Willingale "Production And Evaluation Of Super-Smooth Dip-Coated Foils For High Throughput X-Ray Telescopes", Proc. SPIE 0830, Grazing Incidence Optics for Astronomical and Laboratory Applications, (9 August 1988); https://doi.org/10.1117/12.942180

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