Vacuum-Compatible MIR Multimode Fluoride Patch Cables

  • Transmissive in the UV, Visible, NIR, and MIR
  • For High Vacuum Down to 10-8 Torr
  • Ø5.2 mm Stainless Steel Jacket
  • Ø100 µm Core Diameter


Ø100 µm InF3 Patch Cable, 1 m Long, SMA905 Connectors

Included Caps

ARCAP SMA905 Connectors on Both Ends

Related Items

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Above is the attenuation of the Ø100 µm core InF3 multimode fiber. The shaded region denotes the specified wavelength range over which the cable is guaranteed to meet attenuation specifications. The patch cable offers ≤0.45 dB/m attenuation (≥90% transmission over 1 m) from 2.0 to 4.6 µm, as denoted by the dotted line. For information on run-to-run variations, please see the Graphs tab.


  • Hermetically Sealed Multimode Step-Index Fiber
    • Ø100 µm Core
    • InF3 for MIR (0.3 - 5.5 µm)
  • Construction Enables use at Vacuum Pressures Down to 1 x 10-8 Torr
  • Compatible with Visible-Wavelength Alignment Beams
  • Cleaned and Shipped in Double-Vacuum-Sealed Packaging

Our Vacuum-Compatible InF3 MIR Fiber Patch Cables are part of our vacuum-compatible product line and are designed to be used in high-vacuum environments at pressures as low as 10-8 Torr. The patch cable incorporates a hermetically sealed microtube containing 0.26 NA step-index multimode optical fiber in a Ø5.2 mm stainless steel interlock furcation tube. The InF3 multimode fiber features two SMA905 connectors on both sides of the cable. Both connectors are constructed using ARCAP, a copper, nickel, and zinc alloy that is useful for vacuum applications. The patch cable is double vacuum bagged to help prevent contamination when transported into a cleanroom environment. 

We also offer a KF40 flange fiber feedthrough that uses Ø100 µm InF3 multimode fiber (Item # VK4F1S). The MFV1L1 patch cable is compatible with this flange, and the two can be mated using a vacuum-compatible SMA mating sleeve, such as the ADASMAV.

Item # Fiber Operating
Attenuation Core
NAb Bend Radius
(Short Term/
Long Term)
Connectors Jacket Temperature
MFV1L1 InF3 Multimode 310 nm - 5.5 µm ≤0.45 dB/m
(for 2.0 - 4.6 µm)
100 ± 2.0 µm 192 ± 2.5 µm 0.26 ± 0.02
@ 2.0 µm
≥50.0 mmc /
≥147 mm
SMA905 Ø5.2 mm
Stainless Steel
Interlock Tubing
90 °Cd
75 °Ce
10 °C / minute
  • The fiber’s operating wavelength range is defined as the region where the attenuation is <3 dB/m (>50% transmission per meter).
  • The Graphs tab contains a plot of the NA at other wavelengths.
  • Limited by the cable's furcation tubing.
  • Max Bake Temperature
  • Max Operating Temperature

This tab contains plots of the attenuation, numerical aperture, and refractive indices of our Ø100 µm core InF3 MIR multimode fluoride fiber as a function of wavelength.

The shaded regions in the plots below denote the specified wavelength range over which the cable is guaranteed to meet attenuation specifications. Our Ø100 µm InF3 patch cables offer ≤0.45 dB/m attenuation (≥90% transmission over 1 m) from 2.0 to 4.6 µm. Out-of-band performance is not rigorously monitored during quality control and may vary from run to run.

We are continuously refining our processes for these new materials in order to reduce the variations between runs.


Indium Fluoride Attenuation
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This plot contains the measured attenuation from six independent draws of the Ø100 µm core InF3 fiber. The blue shaded region denotes the 2.0 - 4.6 µm range the attenuation is specified over. Within the 2.0 - 4.6 µm range, the attenuation is largely consistent from run to run, while greater variation between runs is observed in the visible and NIR.
Indium Fluoride Numerical Aperture
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This plot contains the measured attenuation from the Ø100 µm core InF3 fiber. The fiber is able to transmit over the 310 nm to 5.5 µm range.

Numerical Aperture

Indium Fluoride Numerical Aperture
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These NA values were calculated using the refractive indices shown in the plot below.

Refractive Indices

Indium Fluoride Refractive Indices
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These refractive indices were obtained by fitting the Sellmeier equation to measured data. The Sellmeier coefficients used in the fit are given in the table below.

Modified Sellmeier Equation for MIR Fiber
Sellmeier Equation

Sellmeier Coefficients
Coefficient Core Cladding
u0 0.47627338 0.68462594
u1 0.76936893 0.4952746
u2 5.01835497 1.4841315
u3 0.0179549 0.0680833
u4 0.11865093 0.11054856
u5 43.64545759 24.4391868
A 1 1

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MFV1L1 Support Documentation
MFV1L1Ø100 µm, 0.26 NA InF3 Multimode Patch Cable, SMA905, 1 m, Vacuum Compatible