Control of thermally induced porosity for the fabrication of beryllium optics

Harry A. Moreen

doi:10.1117/12.46523

1 September 1991 Control of thermally induced porosity for the fabrication of beryllium optics

Harry A. Moreen

Proceedings Volume 1485, Reflective and Refractive Optical Materials for Earth and Space Applications; (1991) https://doi.org/10.1117/12.46523
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

In this study we have examined the polishability of bare beryllium as it relates to processing for the fabrication of a mirror substrate. Our work has shown that annealing treatments can produce microporosity in the beryllium by a mechanism known as Thermally Induced Porosity (TIP). When the porous material is polished, the achievable scatter is degraded. TIP response is sensitive to the processing history of the material and the effect can vary from minimal to substantial. We have also demonstrated a scatter screening test which can indicate the sensitivity of a given lot of material to TIP.

Citation Download Citation

Harry A. Moreen "Control of thermally induced porosity for the fabrication of beryllium optics", Proc. SPIE 1485, Reflective and Refractive Optical Materials for Earth and Space Applications, (1 September 1991); https://doi.org/10.1117/12.46523

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