The fiber collimators series 60FC-Q has an integrated quarter-wave plate
and is designed for collimating radiation exiting optical fiber cables with high
pointing stability and adjustable right-handed or left-handed circular polarization.
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-Q include:
Optics
The
achromat
with focal length 60 mm is designed for collimating
multiple wavelengths. It is AR-coated from 650 - 1050 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, TILT, and state of polarization
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 opticsof series 60FC-Q 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. The integrated low order retardation optics with minimal angular dependency
allows the adjustment of the state of polarization in the assembled state between
right-handed and left-handed circular polarization. This is done using a
cogged tool
and can be monitored using the
polarization
analyzers series SK010PA.
Retardation optics are available for typical wavelengths between 389 nm and 1084 nm.
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-Q is made from nickel silver/aluminium (standard)
Mounting
The collimator possesses a flange for low-strain mounting e.g. using the
clamp collars series CC.
