An optical grade for fluoride glass

Doped by rare earths, these fibers efficiently emit light in wavelengths 850 nm, 1300 nm, 1460 nm, 2800 nm, etc…

The manufacture of fluoride glass for the design of optical fibres requires specific raw materials with a suitable level of purity, independent of the usual standards.

ZBLAN fibers ZBLAN-type fluorinated optical fibers are composed of ZrF4/ BaF2/ LaF3/ AlF3/ NaF and transmit from the visible to the average infrared (4 μm). Doped by rare earths, these fibers efficiently emit light in bands of wavelengths 850 nm, 1300 nm, 1460 nm, 2800 nm, etc. These characteristics find applications in infrared spectroscopy, but also in optical fiber amplifiers, fibers and laser guides.

Fluorinated fibers based on AlF3 These are multi-component fluorinated fibres whose main component is aluminium trifluoride. They provide lasers with a higher damage threshold and have better water resistance than ZBLAN fibers. Their transmission loss is less than that of GeO2-2.9 μm fibres.

These fibres are used globally as optical guides for laser processing equipment er-YAG 2.94 μm. They are also used as an optical guide in infra-red medium Spectroscopy for their transparency in a wide window between 0.3 and 3.5 μm.