Tutorial:
Coupling a Fiber to the MS257

Overview

Below is a list of Oriel's standard families of fiber optic cables and liquid light guides, and the appropriate adapters to couple them to Oriel® Instruments MS257™ 1/4 m Monochromator and Imaging Spectrographs. Adapters for 3rd party fibers are also available.


Technical Considerations

Some fibers feature two options, where the fiber may be held against the slit or may replace the slit. This option is available for fibers that have rectangular or "slit-like" terminations. If the rectangular slit width is greater than that of the input slit, it is suggested to use the fiber with a slit in order to maintain the desired resolution.

Both standard and quick connect ferrules have an outer diameter of 11 mm. The difference is the way they mate to the fiber holders themselves. The Quick Connect ferrules maintain fiber orientation, even after removal and re-insertion, as well as X, Y and Z alignment.

The use of dual track fibers or other types of fibers for imaging applications requires special consideration because of the magnification introduced by the spectrograph. The instrument's magnification, plus its optical aberrations, magnify the image dispersed over the detector. If the image height is taller than the detector, spectral information will be lost. The MS257 has a vertical magnification of 1.5x.

If throughput is critical, consider using the model 77259 F/# Matcher to improve efficiency. It converts the F/2 of fused silica fibers to F/4, the acceptance cone angle of the MS257 Spectrograph. The 77259 F/# Matcher is specifically designed to maintain the imaging properties of multi-track fibers. Please note that the images are magnified by a factor of 2.0. The detector must be large enough to accommodate the entire magnified image. When these fibers are used with the MS257 and the F/# Matcher, the final composite image height will be magnified by a factor of 3.5 (1.5 by the Spectrograph and 2.0 by the F/# Matcher).

Fiber Coupler Adapters for the MS257 Spectrograph

Fiber Type Fiber Termination Fiber Coupler for MS257
77522 11mm Standard Ferrule, both ends ORIEL-KIT
77533 11mm Standard Ferrule, all terminations ORIEL-KIT
77538 Rectangular End (to MS257 coupler) and
11mm Standard Ferrule
77358-INSERT
(Fiber held against slit) BPT-pg4-100a
(Fiber replaces slit)
BPT-pg8-11 Fluorescence or Reflectance Inspection Probes:

SMA Connector (to light source)
11mm Quick Connect Ferrule (to spectrograph)
11mm Standard Ferrule (common end)
BPT-pg4-100b
(Fiber held against slit)
BPT-pg4-100b
(Fiber replaces slit)
BPT-pg8-11 Fluorescence/Reflectance Probes:

SMA Connector (source, return and common ends)
77670-1
SMA to 11mm Ferrule Adapter with ORIEL-KIT
LS-pg9-52a 11mm Standard Ferrule, both ends ORIEL-KIT
80060 SMA Connector, both ends 77670-1
SMA to 11mm Ferrule Adapter with ORIEL-KIT
78361 SMA Connector, both ends 77670-1
SMA to 11mm Ferrule Adapter with ORIEL-KIT
78253 SMA Connector, both ends 77670-1
SMA to 11mm Ferrule Adapter with ORIEL-KIT
BPT-pg8-21-L 11mm Quick Connect Ferrule (common end) SMA Connector (individual tracks) BPT-pg4-100b
Other fiber optic cables SMA Connector 77670-1
SMA to 11mm Ferrule Adapter with ORIEL-KIT
Other fiber optic cables ST Connector 77675
ST to 11mm Ferrule Adapter with ORIEL-KIT
Other fiber optic cables Cylindrical termination 0.16 inch [4.1 mm] to .31 inch [8.0 mm] diameter, up to 0.48 inch [12.2 mm] long 77-GROUP
Appropriate 11mm Ferrule Adapter with ORIEL-KIT