Fiber Collimator Series 60FC-E-Q

for an ellipical beam cross-section and with a circular state of polarization

Representative product images. Individual product images are found on the individual product pages.


Schäfter+Kirchhoff fiber collimators of series 60FC-E-Q have a collimated elliptical beam with an axis ratio of up to 1:3. These fiber collimators incorporate a quarter-wave plate and generate a circularly polarized beam.
  • Aspect ratio up to 1:3
  • Polarization circularly polarized
  • Gaussian intensity profiles along both elliptical axes
  • Rugged and compact design
  • A front-fitting for attachments, such as a diaphragm
For Fiber Collimators with elliptical collimated beam and linear polarization see series 60FC-E.


In some quantum optical experiments, collimated laser beams with an elliptical cross-section and a circular state of polarization are used, for example as cooling beams in two dimensional magneto-optical traps (2D-MOTs) or in mirror MOTs. They are suitable for polarization-maintaining fiber cables leading to collimated beams with a Gaussian intensity profile and an elliptical beam cross section with an axis ratio of up to 1:3.

An optics for each application
A large variety of optical designs allows that the optimum focal length and the aspect ratio you need can be selected for each application. All lenses are AR-coated.

Optical design
The radiation of the fiber is collimated to a beam with a diameter in the range Ø 1 - 4 mm.
In this collimated beam a low-order quarter-wave plate changes the state of polarization from linear to left-handed or to right-handed circular. An adjacent anamorphic beam shaping optics transforms the circular beam into a beam with an elliptical cross section. Finally the beam is expanded to the desired diameter.

Adjustment of focus
All fiber collimators of seris 60FC-E-Q are aligned for the specified wavelength.
In case of need you can change the distance between fiber end-face and the first collimating optics by means of an eccentric key. The lens does not rotate when adjusting the focus fo both cases. The final focus setting is locked by means of two radially arranged clamping screws. Additionally attachment optics can be mounted to the front of the collimator.

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 can be equipped with FC PC, FC APC, F-SMA ST or LSA (compatible with fiber connectors type DIN, AVIO and AVIM) receptacles. In case of FC or LSA with a spring loaded ferrule the fiber coupler has an additional grub screw to increase pointing stability.

The fiber collimators are made of nickel silver and black anodized aluminum.

The collimators series 60FC-E-Q all posses a flange for low-strain mounting e.g. using the clamp collars series CC.

Besides these series 60FC-E-Q fiber collimators there is the series 60FC-E. These fiber collimators generate a collimated beam with elliptical cross section and a linear state of polarization.

Order Options

Order CodeAspect RatioEff. Focal LengthDesign WavelengthQuarter-Wave PlateClear ApertureFor Connector Type
60FC-E-Q461-4-F30x901 : 330 x   90 mm461nmlow order20 mmFC APC
60FC-E-Q761-4-F30x901 : 330 x   90 mm741 nmlow order20 mmFC APC
60FC-E-Q421-4-F30x901 : 330 x   90 mm421 nmlow order20 mmFC APC
60FC-E-Q671-4-F30x901 : 330 x   90 mm671 nmlow order20 mmFC APC
60FC-E-Q780-4-F57x1141 : 2 57 x 114 mm780 nmlow order29 mmFC APC
60FC-E-Q780-4-F57x1711 : 3 57 x 171 mm780 nmlow order29 mmFC APC
60FC-E-Q780-4-F70x2101 : 3 70 x 210 mm780 nmlow order48 mmFC APC
60FC-E-Q852-4-F70x2101 : 3 70 x 210 mm852 nmlow order48 mmFC APC
60FC-E-Q780-4-F90x1801 : 2 90 x 180 mm780 nmlow order40 mmFC APC


Article_FiberCollimators.pdf (Technote)

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