Ge window has a high refractive index, the application range is 2-15 microns, visible light does not pass through, the product transmittance of uncoated film is not high, generally need to plating anti-reflection film, in order to improve the transmittance of Ge window,
After Ge window plate anti-reflection coating, the common application spectrum range is 3-5 microns, 8-14 microns.
Germanium substrate is relatively sensitive to temperature change, and germanium transmission property is extremely sensitive to temperature change, the higher the temperature, the lower the transmittance, because it is not suitable for > 100 degree high temperature environment, the temperature is greater than 100 degree or even higher temperature environment, will make the germanium substrate low transmittance or opaque.
Infrared thermal imager, Infrared laser system, Infrared optical instrument, Semiconductor,
Aerospace measurement and control,
Nuclear physics detection, Optical fiber communication, Infrared optics, solar cells, Chemical catalysts, Biomedicine and other fields
Have a wide range of important applications.
|Commercial Grade||Precision Grade||High Precision Grade|
|Parallelism||<3 arc min||<30 arc sec.||<2 arc sec.|
|BRD-GW-10 X1||10||1|| AR Coating@3-5um|
As a kind of chemically inert material, single-crystal germanium, with its transmittance spectral range of 2-12um, is a kind of commonly used infrared optical material, which has the characteristics of high hardness, good thermal conductivity and insoluble in water. It is widely used in infrared imaging system and infrared spectrometer system.The single crystal germanium has good mechanical properties and thermal conductivity and small absorption at 10.6um, which makes it an ideal material for CO2 laser lens, window and output coupling mirror.
|Melting point (℃)||936|
|Permittivity Static/high email@example.comGHZ（300K）|
|Coefficient of thermal expansion (1/℃)||6.1x10-6 @298K|
|Elastic Modulus (Gpa)||77.2|
|Shear modulus of elasticity (Gpa)||67|
|Coefficient of thermal conductivity (J/k.m.s)||58.61@293k|
|Specific heat capacity (J/g.k)||0.31|
|Young's modulus (Gpa)||102.7|
|Elastic coefficient||C11=129 C11=48.3 C11=67.1|
|The range of transmission wavelength||2000nm-12000nm|
|The absorption coefficient (1/cm)||1， 1.3x10-3@3800nm2， 3x10-2@10600nm|