114
Apr-09
Avantes
www.avantes.com
5.5.1
Collimating lenses
The COL-UV/VIS collimating lenses screw onto the end of an SMA fiber and convert the divergent
beam of radiation light into a parallel beam. Collimating lenses can be used in any optical setup that
requires parallel beams of light at the illumination source or at the entrance optics or at both sides.
The COL-UV/VIS-90 is used to focus the exit light under 90 °.
Standard optical fibers have a n.a. of 0.22, which is an acceptance angle of 25°. The collimating
lenses are adjustable, providing an acceptance angle of near 0° to about 3°.
The FCR-COL is used to collimate the light of a standard ¼” ferrule reflection probe, the FCR-COL
also has an adjustable focus.
Please follow the below instructions to adjust the focus of your collimating lens:
1.
Connect the fiber between the collimating lens and the light source.
2.
Turn on the light source and focus the light in a white paper in ca. 100 mm distance.
3.
Loosen the setscrew with the Allen Wrench key 1.27 mm on the barrel and slide the inner barrel
until you see a sharp focused spot without light intensity and color variations across the beam
spot.
4.
Tighten the setscrew with the Allen Wrench key 1.27 mm.
Technical Data
COL-UV/VIS
COL-UV/VIS-90
Lens Diameter
6 mm
Lens confocal length
8.7 mm
Lens Material
Fused Silica
Wavelength range
200-2500nm
Fiber connection
SMA 905, UNS 1/4", FC/PC also possible
Mirror reflectivity
n.a.
>90% (200-1100nm)
Housing Material
Aluminum black anodized
Thread
UNF 3/8”-24
Drawing COL-UV/VIS
Drawing COL-UV/VIS-90
