Start // Fiber Optics // Fiber Couplers / Collimators // Coupler // Fiber Collimator for collimating large beam diameters with integrated quarter-wave plate by Schäfter + Kirchhoff - 60FC-Q399-4-M25-01


Fiber Collimator for collimating large beam diameters with integrated quarter-wave plate



The fiber collimator is designed for collimating radiation exiting from an optical fiber cable. An integrated adjustable quarter-wave plate is used to generate left-handed or right-handed circularly polarized radiation.
  • Large beam diameters: Focal length 25 mm
  • Optics type: Doublet optics, Achromatic
  • AR-Coating: 400 - 700 nm
  • Retardation optics for 399 nm
  • Low-order retardation optics with minimal angular dependency
  • Inclined coupling axis, FC-APC connection
  • Integrated TILT adjustment to prevent aberrations from vignetting or clipping
  • Front connector accepts attachment optics


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:

The achromat with focal length 25 mm is designed for collimating multiple wavelengths. It is AR-coated from 400 - 700 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.

The fiber collimator type 60FC-Q is made from nickel silver/aluminium (standard)

The collimator can be placed into a standard mirror mount.

Technical data


Order Code
Focal length
25 mm
AR coating
Wavelength range
400 - 700 nm
Lens type
Doublet optics
Numerical aperture
Clear aperture
11.4 mm
Wave plate
399 nm
Wave plate retardation
Wave plate type
low order
Connector type
Outer diameter
Ø 25 mm
42.5 mm
Tilt adjustment
Front fitting
Ø 19.5 mm
Housing material
Nickel silver/Aluminium
50 g
UHV compatible
Suitable for multimode
Dimensions (for a complete dimensional drawing please refer to the downloads section)


Benefits of user registration include

  • Extended information for download including stepfiles, software or manuals
  • Direct download of user-specific downloads (e.g. user-specific software)
  • Access to previous online requests and the possibility to add complete previous lists to the "Request for quote" list
  • Stored item list
Click here to register.


Screwdriver WS 1.2
Eccentric key with a stroke of ± 1.5 mm.
Hex key WS 1.5
Tool for rotating the wave plate in fiber collimators series 60FC-Q
Attachment optics series 13

to attach in the front of collimators with system mount Ø19.5 mm

Polarization Analyzer SK010PA

Measurement tool for coupling into polarization-maintaining fiber cables