Germanium (Ge crvstal is a chemical inet materal. ts useful transmission range is from 2 to 12 um. which is most commoniv used ininfrared optical components. ts high hardness, good thermal conductivity, insoluble in water features, makes it widely used in infraredmaaing sysiem and inirared snectromeier system. ne mechanca oropertes and therma conductviv ot dermanium s cood. in the ranceof 10.6 um wavelength, its absorption is very smal, which is the ideal material for CO2 laser lens, window and output coupler. Germanium (Gesubstrate materials were also used to make all kinds of infrared filter.
