The fiber collimators series 60FC-T is designed for collimating radiation
exiting optical fiber cables with high pointing stability.
They can also be used in reverse-mode as fiber incouplers. They are suitable for
single-mode and polarization-maintaining fiber cables leading to collimated beams
with a Gaussian intensity profile.
The features of the collimator type 60FC-T include:
Optics
The
achromat
with focal length 75 mm is designed for collimating
multiple wavelengths. It is AR-coated from 1050 - 1620 nm. It is
corrected for spherical aberrations and designed in such a way that it leads to
a diffraction-limited beam with an M2 < 1.05. Additionally it is corrected
for chromatic aberration so that there are certain wavelengths or wavelength
ranges where the focal length does not vary significantly. It is not suitable
for UHV applications.
Adjustment of focus and TILT
The distance between fiber end-face and collimating optics is adjusted by means
of an eccentric key. The lens does not rotate when adjusting the focus. The final
focus setting is locked by means of two radially arranged clamping screws.
Additionally attachment optics of series 60FC-T can be mounted to the
front of the collimator. Additionally, the collimator has an integrated TILT
adjustment for aligning the beam axis to the mechanical axis. This prevents
vignetting of the collimated beam as well as diffraction arising from the clipped
beam.
Optimum lens performance
The angled polish of connectors of type APC is considered by a
pre-angled mechanical coupling axis that compensates the beam deflection and
you can use the lens centrically. This minimizes aberrations simply resulting
from a non-ideal beam path through the lens.
Connector Type
The fiber collimator is equipped with a FC-APC type receptacle.
Because of the spring-loaded fiber ferrule the fiber collimator has an additional grub
screw to increase pointing stability.
Material
The fiber collimator type 60FC-T is made from amagnetic titanium. The relative
permeability is near 1 (µr = 1.00005) making it almost transparent to magnetic fields.
The linear coefficient of thermal expansion is close to that of the optics so that a
thermal stability over a larger temperature range can be expected.
Mounting
The collimator possesses a flange for low-strain mounting e.g. using the
clamp collars series CC.
