Models 77855 and RF-ADAPT adapters hold the rectangular end of our Large Slit Rectangular to Circular Fiber Optic Bundles at the input of Oriel monochromators and spectrographs or other flanged components. The fiber replaces the slit, and these adapters do not require a fixed slit holder for mounting, as they couple directly to the aperture of the monochromator.
When used at the input, much of the light from the fiber overfills the grating and is lost. This is especially true for glass bundles. Even so, the simplicity and convenience of this technique ensure its application when there is plenty of light, and stray light is not a major concern. However, when this is not the case, use the 77358
Fiber Bundle Mount, Rectangular Bundle to 1.5 Inch Female Flange
adapter. When using the 77855 or RF-ADAPT fiber slit at the output, the bundle accepts all the light, which falls on the "fiber slit". Be sure to choose a matching input fixed slit, or set the variable slit to match the "fiber slit".
The 77358 couples the rectangular end of a Large Slit Fiber Bundle to a monochromator slit. If working with a fused silica bundle, use the 77358 with the Focusing Lens Assembly, model 77330
Focusing Lens Assembly, Req. 1 inch Dia. Lens, 1.5 inch Series Flanges
. The 77330 will then focus the bundle's image onto the monochromator input slit. For glass bundles, you may couple the bundle directly to the monochromator slit using only the 77358's spacer tube (the 77330 is not required).