26 July 1999 Correlation of crystallographic orientation with processing of sapphire optics
Author Affiliations +
Sapphire is an ideal optical material and is in used for window and dome applications. The anisotropic properties of sapphire affect the production of high-quality components. Out of the three major orientations, c-axis, a-axis or m- axis, the c-axis is preferred for optical applications as it is the zero birefringence orientation. This orientation is difficult to grow with high quality. Therefore, components are fabricated by sectioning from the sides of a- or m- boules. The anisotropic properties also present problems in grinding and polishing windows for precision optical applications. The degree of difficulty varies with the orientation selected. For hemispherical domes involving polishing of several orientations, it is difficult to achieve a good figure. The choice for larger diameter windows is limited to a- or m-orientation; the m-orientation may be preferable due to the geometry of fabrication-induced stress.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Maynard B. Smith, Keil A. Schmid, Frederick Schmid, Chandra P. Khattak, John C. Lambropoulos, "Correlation of crystallographic orientation with processing of sapphire optics", Proc. SPIE 3705, Window and Dome Technologies and Materials VI, (26 July 1999); doi: 10.1117/12.354611; https://doi.org/10.1117/12.354611


Pushing the boundaries of high power lasers low loss,...
Proceedings of SPIE (February 20 2018)
Recent advances in ALON optical ceramic
Proceedings of SPIE (May 18 2005)
Current status of sapphire dome production
Proceedings of SPIE (September 28 1994)
Workpiece roughness and grindability
Proceedings of SPIE (November 01 1997)

Back to Top