Optical component, zinc sulfide sintered compact, and fabricating method thereof

摘要

Zinc sulfide and an optical component (2; 3) are provided that significantly reduces transmission for visible light and infrared rays of not more than 3 mu m in wavelength, having high transmittance for infrared rays in the wavelength range of 8-12 mu m, and that shields visible light. The optical component is constituted by a polycrystalline zinc sulfide sintered compact formed by hot compression molding fine zinc sulfide powder of high impurity at the temperature of 900-1000 DEG C and the pressure of 150-800 kg/cm<2>. The light transmittance at the region where the thickness is 2 mm is 0% to 3% at the wavelength range of visible light, 0% to 20% at the wavelength range of 2.5-3 mu m, 30% to 75% at the wavelength range of 8-12 mu m, and 50% to 90% at the same wavelength range with the formation of antireflection coating film. <IMAGE>