INFRARED OPTICAL-ABSORPTION LOSS OF ANTIREFLECTION COATINGS ON GERMANIUM AND POTASSIUM-CHLORIDE SUBSTRATES AT THE 10-MU-M WAVELENGTH BY THEPHOTOTHERMAL DEFLECTION TECHNIQUE

The photothermal deflection technique is used to study the infrared ab sorption of antireflection coatings on Ge and KCl substrates. The thin films deposited by the thermal resistance evaporation technique, both with and without ion-assisted deposition, are investigated. The exper imental results show that Ar-ion bombardment with low energy can evide ntly reduce the absorption of the coatings.