These probes are primarily used to collimate the diverging output from an Oriel® Fiber Bundle. We offer dedicated probes to ollimate the output from our Liquid Light Guides.
Move the fiber bundle away from the lens to produce a focused image ; to image at short distances use a Focusing and Imaging Beam Probes for Fiber Bundles.
The 77644 Probe has a fused silica, 19 mm effective focal length lens. It captures and collimates the output cone from fused silica bundles. The 77645 has a low F/# compound glass lens with an 11 mm effective focal length. It collimates the highly divergent output from glass bundles, and transmits over their useful spectral range.
Models with Shutters
The 77652 and 77653 Beam Probes use the same collimating lenses as the 77644 and 77645 Probes, and operate in the same manner, but include a shutter between the bundle and the collimating lens. This allows you to cut off the beam and check the “radiometric zero.”
Tech Note
You cannot produce a well collimated beam from a large aperture fiber bundle. The smallest divergence angle, for a perfect optical system is given by:
Where:
θ = Full angle divergence
d = Fiber bundle diameter
f = Lens effective focal length
