These assemblies, plus a fiber, convert a collimated light source into a fiber optic source. All the components necessary to image a source onto the face of a glass or fused silica bundle are contained in a single enclosure - focusing lens, manual shutter and a fiber bundle holder. One end of the housing has a male flange to couple to an Oriel® light source condenser; the other end accepts fiber bundles with an 11 mm ferrule, or single fibers with appropriate connector.
We offer two models of fiber focusing assemblies; both use an aspheric lens. Aspheric lenses almost completely eliminate spherical and chromatic aberrations ensuring a very tightly focused spot and greater throughput than conventional plano convex lenses. Choose the 77799 Assembly for glass fiber bundles and liquid light guides, and choose the 77776 Assembly for fused silica fiber bundles and single core fibers.
Fused Silica and Pyrex Aspheric Lenses
We offer two models of fiber focusing assemblies, differinging the lens material. Both use an aspheric lens. Aspheric lenses almost completely eliminate spherical and chromatic aberrations ensuring a very tightly focused spot and greater throughput than conventional plano convex lenses.
The 77799 Assembly uses a pyrex F/0.85 lens; it is perfectly matched to our glass fiber bundles and liquid light guides. The new 77776 Assembly uses a fused silica F/2.2 lens, matched to the input of our fused silica fiber bundles and single core fibers. Table 1 compares the spot size and throughput of these two assemblies to a plano convex focusing assembly. The source was a 75 W Xe arc lamp with a 0.25 x 0.5 mm arc size, collimated by an F/1.5 condenser, and re-imaged using the three assemblies listed in the table.
We also offer the fused silica aspheric lens system without the fiber assembly, for imaging onto samples. The spot size is 10 mm in front of the assembly's output flange.
Table 1 Comparison of Fiber Optic Focusing Assemblies
|
Fiber Optic Assembly |
Typical Spot Size |
Fiber Throughput |
| 77799
|
4 mm |
0.58 |
| 77776
|
800 µm |
1.57 mA |
| Plano Convex Assembly |
5 mm |
0.337 mA |
