If you need to precisely image a source onto a small target, use one of these focusing assemblies. They are ideal for re-imaging a source onto an Oriel Monochromator or Spectrograph slit, fiber bundle, or cuvette. You can also use one of these assemblies to image the monochromator output onto a detector or fiber.
Two Models Available
Two models of focusing assembly are available, each has X, Y, and Z adjustments. Both require at least one lens. The lenses are not included; use the Ordering Information Tables as a guide for selecting the proper focal length lens(es).
Model 77260
- Best use is for imaging the output of a monochromator onto a detector or fiber
- Integral filter holder and manual shutter
- 20 mm clear aperture
The 77260 holds two lenses; one acts as the “condenser”, collimating light from the source or monochromator exit, the second focuses the collimated beam (see Fig. 1). Lens 1 is adjustable ±3 mm in the X and Y directions for precise positioning of the image onto small targets (i.e. fiber bundles). Lens 2 has 2.9 inches (73.7 mm) of Z (focus) adjustment.
Model 77259
- Best use is to focus a collimated source onto a small target (slit, fiber, cuvette)
- Lower cost, stripped down version (no integral filter holder and shutter)
- Larger clear aperture, 1.3 inch (33 mm), gives you more than twice the throughput of the 77260
The 77259 uses only one lens. With a plano convex lens, the 77259 will focus a collimated beam, or collimate a diverging beam. With a bi-convex lens it will refocus a beam, but introduces a significantly higher level of spherical aberrations. The clear aperture of this assembly is 1.3 inches (33 mm), the size of the collimated beam from our 1.5 Inch Series Oriel Light Sources.
A Word About Spherical Abberation
Although you can use a single lens (bi-convex in the 77259 ) to image a source, we recommend that you first collimate it and then focus it (using a two lens system in the 77260 ), thus reducing spherical aberration by a factor of 4.
Fig. 1 77259 X-Y-Z Focusing Lens Assembly focuses the output from an Oriel Research Source onto the entrance slit of the CornerstoneTM 130 1/8 m Monochromator.
