USEFUL MATERIAL  INFORMATION

Zinc Selenide Gallium Arsenide
CVD produced ZnSe transmits very well from 0.6 microns in the visible to 15 microns in the infrared. Due to its low absorptivity at several laser wavelengths ZnSe is an 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 industrial applications as well as in industrial and field applications as well as in laboratory environments.

 

GaAs provides an alternative to ZnSe in medium and high power CW CO2 laser systems for lenses and beam splitters. It is particularly useful in applications where toughness and durability are important. Its hardness and strength make it a good choice where dust or abrasive particles from the workpiece tend to build up on or bombard an optical surface. Often in cases where frequent cleaning by wiping is required, 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 versatile 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 throughput 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 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.