Optical fiber feedthroughs for vacuum applications – Multimode

Optical Fiber Feedthroughs - MultimodeVACOM-manufactured fiber feedthroughs with integrated multimode fibers are made for the specified wavelength ranges. As a standard, VACOM produces fibers with a core diameter of 50 µm, 200 µm, 400 µm and 600 µm. These feedthroughs cover many applications in the ultraviolet range (UV), in the visuall range (VIS), and in the near infrared range (NIR). Fibers with a core diameter of 200 µm - 600 µm provide a refractive index  with step-index distribution. The MM50 fiber is a graded index fiber which shows minimal mode dispersion due to an optimized refractive index.

Multimode fiber feedthroughs are manufactured by VACOM with FSMA connectors. The only exception is the MM50 fiber which is available with FC/PC and FC/APC connectors. This fiber requires a very high precision in the core alignment.

Often, the MM50 fibers are used for confocal metrology. In these cases, VACOM recommends to use the fiber with FC/APC plugs since those technologies demand low reflections from the ferrule interfaces. VACOM's feedthroughs for multimode fibers combine an integrated coupling which ensures highest connection precision with a compact design and excellent behaviour in vacuum conditions. This makes them an ideal solution for many measurement applications like micro positioning, confocal applications, and spectroscopic experiments.

 VACOM's standard multi mode fibers used for fiber feedthroughs:

Wavelength for transmission

Core diameter

NA

Cladding

Information

500-1300 nm

50 µm

0,2

125 µm

FC/PC & FC/APC

190-1100 nm

200 µm

0,22

220 µm

UV configuration, FSMA

400-2400 nm

200 µm

0,22

220 µm

IR configuration, FSMA

190-1100 nm

400 µm

0,22

440 µm

UV configuration, FC/PC, FSMA

400-2400 nm

400 µm

0,22

440 µm

IR configuration, FC/PC, FSMA

500-2600 nm

400 µm

0,36

440 µm

IR configuration, Germanium doped, FC/PC, FSMA

 190-1100 nm

600 µm

0,22

660 µm

UV configuration, FSMA 

400-2400 nm

600 µm

0,22

 660 µm

 IR configuration, FSMA

On request, the fiber feedthroughs can be delivered  with your specialized fiber. Please contact your VACOM sales representative.

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