LVF Catalog

Fluoride Glass Fibers

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Fluoride Fibers

General properties

Learn more about our fluoride glass fibers specifications

Since the discovery of ZBLAN glasses in 1974, Le Verre Fluoré has worked to develop a large range of fluoride optical fibers, including ZrF4, InF3 and AlF3 based optical fibers, designed for mid infrared applications.

Find below some specifications of our multimode and single mode fibers such as typical transmission or attenuation, long term bending radius and working temperatures.

ZFG (ZBLAN FLUORIDE GLASS) fibers

ZFG fiber are transparent from 0.3 up to 4.5 µm. Please find below there specifications (geometry, numerical aperture, attenuation, operation wavelength and operating temperatures)

  • ZFG MULTIMODE

Operating wavelength
Typical optical loss @ 2.5µm
Fresnel loss (backwards reflection)
Coating material
Operating temperature

0.3 – 4.5 µm
< 10 dB/km
4% per face (air)
UV curable acrylate
– 180 to 150 °C

Standard fiber
Core/cladding diameter
Numerical aperture
Short term bend radius
Long term bend radius
ZFG MM (0.15) 90/150
90/150 µm
0.15
≥ 15 mm
≥ 45 mm
ZFG MM (0.20) 90/150
90/150 µm
0.20
≥ 15 mm
≥ 45 mm
ZFG MM (0.20) 200/260
200/260 µm
0.20
≥ 25 mm
≥ 75 mm
ZFG MM (0.20) 300/360
300/360 µm
0.20
≥ 35 mm
≥ 100 mm
ZFG MM (0.20) 400/460
400/460 µm
0.20
≥ 45 mm
≥ 120 mm
ZFG MM (0.20) 600/680
600/680 µm
0.20
≥ 70 mm
≥ 150 mm

Typical ZrF4 Multimode fibers attenuation and transmission:

  • ZFG SINGLEMODE

Typical background loss
Fresnel loss (backwards reflection)
Coating material
Operating temperature

< 10 dB/km
4% per face (air)
UV curable acrylate
– 180 to 150 °C

Standard fiber
Core/cladding diameter
Numerical aperture
Cutoff wavelength
Operating wavelength
Short term bend radius
Long term bend radius
ZFG SM [1.95] 6.5/125
6.5/125 µm
0.23
1.95 µm
0.3-3.9 µm
≥ 15 mm
≥ 45 mm
ZFG SM [2.55] 8.5/125
8.5/125 µm
0.23
2.55 µm
0.3-4.5 µm
≥ 15 mm
≥ 45 mm
ZFG SM [2.2] 14/250
14/250 µm
0.125
2.3 µm
0.3-4.0 µm
≥ 25 mm
≥ 75 mm

Typical 8.5/125 ZrF4 Singlemode fibers attenuation and transmission:

IFG (Indium FLUORIDE GLASS) fibers

IFG fiber are transparent from 0.3 up to 5.5µm. Please find below there specifications (geometry, numerical aperture, attenuation, operation wavelength and operating temperatures)

  • IFG MULTIMODE

Operating wavelength
Typical optical loss @ 3.5µm
Fresnel loss (backwards reflection)
Coating material
Operating temperature

0.3 – 5.5 µm
< 10 dB/km
4% per face (air)
UV curable acrylate
– 180 to 150 °C

Standard fiber
Core/cladding diameter
Numerical aperture
Short term bend radius
Long term bend radius
IFG MM (0.20) 100/160
100/160 µm
0.20
≥ 15 mm
≥ 45 mm
IFG MM (0.30) 130/200
130/200 µm
0.30
≥ 15 mm
≥ 45 mm
IFG MM (0.20) 200/260
200/260 µm
0.20
≥ 25 mm
≥ 75 mm
IFG MM (0.20) 300/360
300/360 µm
0.20
≥ 40 mm
≥ 100 mm
IFG MM (0.20) 400/460
400/460 µm
0.20
≥ 55 mm
≥ 120 mm
IFG MM (0.20) 600/680
600/680 µm
0.20
≥ 90 mm
≥ 150 mm

Typical InF3 Multimode fibers attenuation and transmission:

  • IFG SINGLEMODE

Typical background loss
Fresnel loss (backwards reflection)
Coating material
Operating temperature

< 35 dB/km
4% per face (air)
UV curable acrylate
– 180 to 150 °C

Standard fiber
Core/cladding diameter
Numerical aperture
Cutoff wavelength
Operating wavelength
Short term bend radius
Long term bend radius
IFG SM [2.95] 7.5/125
7.5/125 µm
0.30
2.95 µm
0.3-5.5 µm
≥ 15 mm
≥ 45 mm
IFG SM [3.3] 8.5/125
8.5/125 µm
0.30
3.3 µm
0.3-5.5 µm
≥ 15 mm
≥ 45 mm
IFG SM [3.7] 9.5/125
9.5/125 µm
0.30
3.7 µm
0.3-5.5 µm
≥ 15 mm
≥ 45 mm
Typical 7.5/125 InF3 Singlemode fibers attenuation and transmission:

AFG (ALUMINIUM FLUORIDE GLASS) fibers

AFG fiber are transparent from 0.3 up to 4.0µm. Please find below there specifications (geometry, numerical aperture, attenuation, operation wavelength and operating temperatures)

  • AFG MULTIMODE

Operating wavelength
Typical optical loss @ 2.2 µm
Fresnel loss (backwards reflection)
Coating material
Operating temperature

0.3 – 4.0 µm
< 60 dB/km
4% per face (air)
UV curable acrylate
– 180 to 150 °C

Standard fiber
Core/cladding diameter
Numerical aperture
Short term bend radius
Long term bend radius
AFG MM (0.20) 70/125
70/125 µm
0.20
≥ 20 mm
≥ 45 mm
AFG MM (0.30) 200/250
200/250 µm
0.30
≥ 30 mm
≥ 75 mm

Typical AlF3 Multimode fibers attenuation and transmission: