This is an SMA fiber coupler (FC style also available) with an interface flange mount to the input port of a Sciencetech monochromator or spectrograph (fiber not included). Please note two versions are available. One version is for the Sciencetech Model 9030 monochromator which utilizes its own slit interface flange design. The other version is for all other Sciencetech Series 9000 and 8000 monochromators and spectrographs which utilizes a common slit interface flange design. With an FIB1 at the input port, a slit (fixed or adjustable) is not necessary as the width of the input fiber typically defines the input slit width. Please note that this fiber connection does not address the f number matching issue between the fiber and the monochromator or spectrograph. Hence if it is used at the input port of the monochromator or spectrograph, significant light loss can be expected with the fiber having an f number closer to 1. If this is an issue, please speak to a Sciencetech Applications Specialist about using a condensing lens assembly with the FIB4 or FIB5 instead.

F Number Matching
The FIB1 is not a proper way to mate a fiber to the input port of a monochromator or spectrograph as it does not address the issue of F number matching. A fiber typically has an F number of 1 (depends on its numerical aperture), and a monochromator/spectrograph F number can vary from F/2.5 to F/8 depending on the model selected. With this non-matching F number, much of the light would be lost by just directly coupling a fiber to the monochromator using the FIB1. For proper interface, a condensing lens assembly after the FIB1 to change the F number leaving the fiber is recommended. Please contact a Sciencetech Applications Sales Specialist on how to achieve this at sales@sciencetech-inc.com.

Mating to Input Port Versus Output Port of a Monochromator
F Number matching as described above is particularly important if the fiber is mated to the input port of the monochromator or spectrograph. The FIB1 which does not have this F number matching feature would loose lots of light. However, this is not an issue if connected to the output port of a monochromator. The reason is that the aperture of the fiber, which is close to F/1, is much wider than most monochromators and hence would be able capture all the output light despite the fact that the F numbers do not match.

Difference between FIB1 and FIB4/FIB5
FIB1, FIB4 and FIB5 are all fiber interface flanges. The difference is in the flange design itself. The FIB1 flange is designed for mating a fiber to the input port (or output port) of a Sciencetech Monochromator or Spectrograph whereas the FIB4 and FIB5 flanges are designed for interfacing to Sciencetech's 1" and 2" diameter coupling tubes. These coupling tubes allow focusing optics inside such that incoming light can be focused into the fiber or vice versa and hence the FIB4 and FIB5 are often used with Sciencetech light sources.

Small Diameter Fibers Less than 1250µm Diameter
The FIB1 comes in two connector styles, SMA and FC. Both styles support fibers up to 1250µm in diameter and hence cannot accept larger diameter bundle connectors commonly used in light transmission. For large bundle connectors, please see Sciencetech Model FIB2 for direct connection to a Sciencetech Monochromator and Spectrograph, and Sciencetech Model FIB4 for connection to Sciencetech 1" and 2" diameter coupling tubes.

No Slit Assesmbly Required
The FIB1 was designed to be mounted directly to the input port of a Sciencetech monochromator or spectrograph without the use of an input slit. The flange design of the FIB1 is the same as the flange design of the slit assembly and hence can be mounted in its place. The reason why a slit assembly is not required is because the width of the fiber is often used as the width of the input slit. If a slit is desired, please contact a Sciencetech Applications Specialist first as the slit assembly face may have to be customized for the interface of this FIB1 connector.

Fiber Not Included
Please note that different kinds of single fibers can be used with this connector but are sold separately.

Technical Specifications

• Special Version for Sciencetech 9030 monochromator
• Common Version for all other Sciencetech monochromators and spectrographs
• SMA or FC style connectors
• FC style connectors limited to 125μm and 140μm diameter fibers