Single-Point Diamond-Turned Mirror Performance Before And After Polishing

Jon E. Sollid

doi:10.1117/12.957731

13 November 1980 Single-Point Diamond-Turned Mirror Performance Before And After Polishing

Jon E. Sollid

Proceedings Volume 0190, Los Alamos Conference on Optics 1979; (1980) https://doi.org/10.1117/12.957731
Event: Los Alamos Conference on Optics '79, 1979, Los Alamos, United States

Abstract

The surface finish of a single-point diamond-turned (SPOT) mirror produced in 1977 on the large (2-meter swing) Excello lathe at the Union Carbide Corporation's Y-12 Plant in Oak Ridge, Tennessee, was such that it was not possible to do visible alignment using it. Therefore, it was necessary to polish the mirror by hand. This was done at the University of Arizona. The intent was to remove the high ridges in the SPDT mirror but not to degrade the figure. Both interferometric and encircled energy measurements were made on the mirror before and after polishing. The mirror was an f/2 off-axis parabola 39.37 cm in diameter. The equation describing the generator of the mother parabola is y2 = 309x(cm2) and the center of each off-axis sister mirror is at x = 7.64 cm, and y = 48.59 cm. After polishing it was possible to align it using techniques which employed visible light. Furthermore, the polished mirror was about 20% better as far as the rms surface figure was concerned, although cosmetically the surface finish appeared visibly degraded after polish.

Citation Download Citation

Jon E. Sollid "Single-Point Diamond-Turned Mirror Performance Before And After Polishing", Proc. SPIE 0190, Los Alamos Conference on Optics 1979, (13 November 1980); https://doi.org/10.1117/12.957731

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