... , lenses and prisms in the ultraviolet and infrared optical system where extreme durability is required. Its ... OPTICAL FIBER;3.OPTICAL PROCESSING AND OPTICAL FILM( Optical elements polishing: Lens, prism, windows,IR windows; Optical coating service: AR, HR, PR, BBAR, IR, UV filter ... ) 4.SYNTHETIC CRYSTAL(Fluoride Optical Crystal ;Fluoride Scintillation Crystal);5.SPECIAL ...