Collimators and Refocusing Assemblies

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Collimators

Multimode Fibre Optics from Glen Spectra. Our standard Fibre Optic Collimators employ plano-convex lenses positioned at their focal length from the optical fibre tip. The standard collimators use SMA female connectors for ease of coupling to standard 0.22 N.A. fibre optic cables.

For light exiting from an optical fibre, collimators expand the beam and decrease the divergence by the ratio of the fibre core diameter to the collimator aperture.

Example: A 100 µm core diameter fibre with an N.A. of 0.22 has an output divergence of ±12.7°. When coupled to an LC-4, its divergence is reduced to 0.100/4.00 x ±12.7° ±0.3° at its center wavelength.

Conversely, light entering the collimator will be focused into the fibre.

Refocusing Assemblies

Our UV-Vis and Vis-NIR Refocusing Assemblies are offered for the LC-4, LC-10, and LC-22 series collimators. These single-element cells thread into the collimator, refocusing the beam at a given distance. Standard refocusing assembles are listed below. Other focal lengths and AR coated optics are available on a custom basis.

Other Available Options: FC, ST and SC connectors, .25" ferrules; Operation with other N.A.’s such as 0.12, 0.26, 0.37, and 0.40; AR coated optics for 98% transmission at peak wavelength.

LC-4 Series

LC-10 Series

LC-22 Series

For other fibre configurations, numerical apertures, termination types, etc., see Custom Products.