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USEFUL MATERIAL  INFORMATION
Zinc Selenide Gallium Arsenide
CVD produced ZnSe transmitsvery well from 0.6 microns in the visible  to 15 microns in the infrared. Due to its low absoptivity at several laser wavelengths ZnSe is a excellent in many laser system for lenses, windows, output couplers and Beam splitters. Because of its broad transmission range and specifically its low absorption and scatter in 8-14 microns region,ZnSe is a standard material for use in FLIR and other infrared instruments or imaging systems .ZnSe is non-hygroscopic,chemically stable unless treated with strong acids, and safe to use in inustrial applications as well as in industrial and field applications as well as in labrotary environments.

 

 GaAs provides an alternative to ZnSe in medium and high power CW CO2 laser systemsfor lenses and beam splitters. It is particularly useful in applications where toughness and durability are important. Its harness and strength make it a goo choice where dust or abrasive particles from the workpiece tend to buil up on,or bombard an optiacl surface. Often in cases where frequent cleaning by wiping is require , use of GaAs will extend optic lifetime. The material is non hygroscopic , safe to use in labs and field applications and it is chemically stable except when contacted with strong acids.
Germanium Arsenic Trisulphide(AS2S3)
Ge is a verstile IR material used commonly in imaging systems and instruments in 2-14 microns region for the lenses, windows and output couplers for low power CW as well as pulsed TEA CO2 lasers. Ge is limited to thruput power range of 50-100 watts before the on-set of the significant thermal lensing or thermal runaway.Ge is non hygroscopic and has good thermal conductivity,excellent surface hardness and good strength. Arsenic Trisulphide glass is an inexpensive infrared material, which is somewhat transparent in the visible and goes out to 9 microns. It is used to make lenses and windows for IR thermometers and other instruments.