Profile: Fairfield Crystal Technology, LLC offers single-crystal materials, which develops next generation semiconductor devices and precision optical components. Our semiconductor substrates or optical components are suitable for commercial, industrial and military applications. We provide zinc sulfide, lithium & calcium fluoride and aluminum nitride. Our clear multispectral zinc sulfide transmits from the visible spectrum to the far infrared. We produce large grain crystal material that reduces scattering and offers low absorption making it an ideal crystal for FLIR and other IR applications.