FIG. 4 Optical Microscope of the BaF₂ layers.
The left side shows optical Nomarski images of the BaF₂ layers at different growth temperatures. The magnification is 100 x Object. The right side shows 5 mm by 5 mm AFM pictures of the BaF₂ layers at different growth temperatures. (a), (b), and (d) have colors scales ranging from 0 (black) to 12 nm (white). (c) has a color scale ranging from 0 to 22 nm, and (e) has a color scale ranging from 0 to 50 nm.