diamond;
optical coating;
microwave plasma chemical vapor deposition;
surface-wave plasma;
D O I:
10.1364/AO.36.004400
中图分类号:
O43 [光学];
学科分类号:
070207 ;
0803 ;
摘要:
We utilized a microwave plasma reactor based on a surface-wave-sustained discharge for uniform coating of fused silica windows with polycrystalline diamond films. Grain size and average roughness as small as 30 and 2.2 nm, respectively, were obtained, resulting in a uniform loss of transparency of only 10% over the 190-800-nm band for as-deposited 1.5-mu m-thick coatings. A pretreatment procedure provides a film coating with a surface resistance to scratching that is approximately a factor of 2 higher than that of bare fused silica. (C) 1997 Optical Society of America.