Infrared optical properties of CdTe coatings deposited by PVD method w
ere investigated by interference method. With the study of CdTe coatin
gs deposited at different substrate temperature and of different thick
ness, it was found that CdTe coatings are inhomogeneous, and the refra
ctive index of CdTe coatings varies with the thickness of layer. It wa
s also found that the substrate temperature between 120 degrees C and
200 degrees C almost has no effect on optical properties of CdTe coati
ngs.