Start // Fiber Optics // Fiber Couplers / Collimators // Coupler // Fiber Coupler for SMA-905 High Power Connectors by Schäfter + Kirchhoff - 60FC-SMA-T-23-M25-01


Fiber Coupler for SMA-905 High Power Connectors



High precision fiber coupler optimized for high pointing stability and long-term stability specially designed for SMA-905 high power connectors with 0°, 5° or 8°-polish. Efficient coupling of collimated laser radiation into single-mode and PM fiber cables including PCF fibers.
  • Focal length 25 mm
  • Optics type: Doublet optics, Achromatic
  • AR-Coating: 400 - 700 nm
  • Compatible with high power SMA-905 connector
  • Integrated TILT adjustment to prevent aberrations from vignetting or clipping
  • Front connector accepts attachment optics


The fiber coupler series 60FC-SMA is designed for coupling into SMA-905 high power connectorized single-mode and polarization-maintaining fiber cables including PCF fibers cables. It can also be used to collimate radiation exiting such fiber cables. Please note that the collimated beam profile strongly depends on fiber properties and is not Gaussian for PCF fibers.
The features of the coupler type 60FC-SMA 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 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-SMA can be mounted to the front of the collimator. Additionally, the collimator has an integrated TILT adjustment. Unlike common FC-type connectors, the SMA-905 High Power Connector does not have a spring-loaded ferrule. With varying ferrule length, the point of emission not only shifts axially, but also laterally with respect to the optical axis in the case of an inclined polish (5° and 8° -polish). By using the TILT adjustment, the point of emission can be adjusted onto the mechanical axis of the fiber coupler. When collimating a laser beam, the integrated TILT adjustment for the fiber coupler 60FC-SMA-T prevents vignetting or diffraction arising from a clipped beam. When coupling into a fiber, high efficiencies can only be reached when the tilt is adjusted properly.

Optimum lens performance
The angled polish of connectors of type SMA-905 with 5° or 8° 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 F-SMA type receptacle. Unlike the fiber collimators for FC-PC or FC-APC connectors (60SMS or 60FC-T) the fiber connectors of type high power SMA 905 do not have an index key for alignment of the polarization axis of the fiber cable. A groove in the collimator helps with the manual axis alignment.

The fiber collimator type 60FC-SMA 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
Connector type
F-SMA 5°
Outer diameter
Ø 25 mm
40 mm
Tilt adjustment
Front fitting
Ø 19.5 mm
Housing material
Nickel silver/Aluminium
64 g
UHV compatible
Suitable for multimode
Dimensions (for a complete dimensional drawing please refer to the downloads section)


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Eccentric key with a stroke of ± 1.5 mm.
Hex key WS 1.5
Polarization Analyzer SK010PA

Measurement tool for coupling into polarization-maintaining fiber cables