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Infra-red (IR) materials, optically transmissive at wavelengths greater than approximately 1 micron, are integral to a variety of devices and applications. These applications include lidar, thermal imaging, military countermeasures, spectroscopy, biomedical research and remote sensing (including environmental monitoring and the detection of biological agents). Rising EO afford cold processing and coating of IR material. Essential to the enhanced performance of any IR material or device are our custom- designed antireflection (AR) coatings. Our major processing IR material as follow:
● Silicon
Usually we are handling Silicon monocrystalline, CZ and FZ, optical and mirror grade.
Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns. To avoid this, material can be prepared by a Float-Zone (FZ) process. Optical silicon is generally lightly doped (5 to 40 ohm cm) for best transmission above 10 microns, and doping is usually boron (p-type) and phosphorus (n-type). After doping silicon has a further pass band: 30 to 100 microns which is effective only in very high resistivity uncompensated material.
CZ Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5 - 8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Application as window, lens in the 1.5 - 8 μm region; Mirror for CO2 laser and spectrometer applications.
● Germanium
Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 μm wavelength band. Its high refractive index makes Ge ideal for low power imaging systems because of minimum surface curvature. Chromatic aberration is small, often eliminating the need for correction.
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