Study of eco-friendly chalcogenide glass compositions for infrared optical lens of smart devices

Infrared optics technology has continued to advance in both military and civilian applications. In parallel, infrared transmitting lenses have been developed to improve the performance of infrared cameras. However, commercial Chalcogenide glass includes As or Sb which are not unsuitable for smart devices. To address this issue, novel Ge-Ga-Se ternary compositions were developed and evaluated for the lens applications. XRD was used to determine the glassforming ability. glass transition temperature was measured to determine the thermal properties. Some mechanical properties such as Knoop hardness and its coefficient of thermal expansion were performed to determine the durability of the glass. The average transmittance in the range of 8~12μm shown 60.819% and the refractive index @8, 10, 12μm were 2.51425, 2.50706 and 2.49798, respectively. The dispersion of current system shows 92.63, which is good enough to design LWIR lens.