抄録
This paper describes the recent progress for ultraprecision machining of functional optical materials havingpeculiarities such as physical anisotropy, softness, brittleness, deliquescence, and narrow phase matching angleacceptance. Those peculiarities introduce the difficulty for producing optical surfaces by using the conventionaloptical polishing process. Both single point diamond turning and ultraprecision grinding can produce opticalsurfaces on such functional optical materials under very special machining conditions. The relation betweencrystallographic orientation and machining direction is important for producing optical surfaces on nonlinearoptical crystals. Machining fluid is also a key factor in such processes.
