Features
Casing feed-through type CFT with integrated fiber cable.- For bore hole Ø 10.7 mm
- Integrated multimode fiber cable
- Fiber type MMC-S-VIS/NIR-100-NA022
- Cable lengths 30/120 cm (inside / outside vacuum)
- Connector type FC APC (both ends)
Description
The fiber cable with casing feed-through made by Schäfter+Kirchhoff is equipped with a multimode fiber cable for type MMC-S-VIS/NIR-100-NA022. The casing feed-throughs type CFT are installed by threading the outside part of the cable through an aperture from the inside of the casing.They are designed for casings with a Ø 10.7 mm through hole.
End-to-end fiber cable
The vacuum feed-through is supplied with a non-exchangable, continous, end-to-end fiber cable. That means there is no additional fiber connection (mating) at the vacuum flange.
The benefit is no additional coupling losses due to mating
Multimode fiber cable
On the casing side, the fiber cable is equipped with Ø 900 μm buffer made of Hytrel. The part of the fiber cable outside the casing, has a Ø 3 mm cable with Kevlar strain-relief with bend protection both at the fiber connector and the flange.
Technical data
CFT-MMC-S-VIS/NIR-100-NA022-18-30/120
Order Code
CFT-MMC-S-VIS/NIR-100-NA022-18-30/120
Formaly known as
CFT-MMC-S-VIS/NIR-100-NA022-APC/APC-30/120
Series
Flange type
CFT
Material
Nickel silver
Fiber type
MMC-S-VIS/NIR-100-NA022
multimode
step-index
Wavelength range
VIS - NIR
NA nom.
0.22
Core diameter
Ø 100 µm
Inside casing
Buffer
Ø 900 µm Hytrel, black
Cable length
30 cm
Min. bend radius
15 mm
Connector type
FC APC
Key width
wide key
Bend protection
Polymer
Outside casing
Cable
Ø 3 mm cable with Kevlar strain-relief
Cable length
120 cm
Min. bend radius
40 mm
Connector type
FC APC
Key width
wide key
Bend protection
Polymer
Temperature range
-10 °C - 70 °C
FAQ
- Multimode fiber coupling
- Why does my beam profile change when I touch the fiber?
The beam profile exiting a multimode fiber is strongly dependent on how the light interacts within the fiber and is often very different from that of a single-mode fiber - it might even change with time and fiber position. For a good, symmetric, and âsuper-Gaussianâ distribution of light exiting the multimode fiber (aside from laser speckle), it is important that mode mixing has occurred within the fiber or that multiple modes have been excited from the start when coupling in.
For example, if you couple light into the fiber from a single-mode laser source, only a few modes will be excited. If you then change the fiber position or touch the fiber, the ex-fiber beam profile can change rapidly over time because different modes are excited that may not have a symmetric, Gaussian-like output (e.g. donut modes).
To avoid this, you can either make the multimode fiber longer (to increase mode mixing as it passes through the fiber) or coil the fiber with a smaller bend radius to increase mode mixing. You can also choose a smaller focal length to have a larger light cone when coupling into the fiber, which in turn excites more modes. Often a combination of these three strategies will result in a stable, âsuper-Gaussianâ beam profile exiting the multimode fiber. - Why does my beam profile look non-Gaussian?The beam profile exiting a multimode fiber is strongly dependent on how the light interacts within the fiber and is often very different from that of a single-mode fiber - it might even change with time and fiber position. For a good, symmetric, and âsuper-Gaussianâ distribution of light exiting the multimode fiber (aside from laser speckle), it is important that mode mixing has occurred within the fiber or that multiple modes have been excited from the start when coupling in.For example, if you couple light into the fiber from a single-mode laser source, only a few modes will be excited. If you then change the fiber position or touch the fiber, the ex-fiber beam profile can change rapidly over time because different modes are excited that may not have a symmetric, Gaussian-like output (e.g. donut modes).To avoid this, you can either make the multimode fiber longer (to increase mode mixing as it passes through the fiber) or coil the fiber with a smaller bend radius to increase mode mixing. You can also choose a smaller focal length to have a larger light cone when coupling into the fiber, which in turn excites more modes. Often a combination of these three strategies will result in a stable, âsuper-Gaussianâ beam profile exiting the multimode fiber.
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