Fiber Collimator series 60FC-SMA

specially designed for SMA-905 high power connectors with 5° or 8°-polish.

Fiber Collimator 60FC-SMA-T-23
Fiber Collimator 60FC-SMA-T-23
Fiber Collimator 60FC-SMA-T-23
Representative product images. Individual product images are found on the individual product pages.

Features

High precision fiber coupler optimized for high pointing stability and long-term stability - specially designed for SMA-905 high power connectors with 5° or 8°-polish. Efficient coupling of collimated laser radiation into ­single-mode and PM fiber cables including PCF fibers.
  • Focal lengths up to 30 mm
  • Choice of aspheres, singlet, monochromats or achromats
  • Various AR coatings for UV - IR
  • Compatible with high power SMA-905 connector with 5° or 8°-polish
  • Focussing of the optics using an eccentric key
  • Integrated TILT adjustment to prevent aberrations from vignetting or clipping
  • Front connector accepts attachment optics

Description

The fiber couplers series 60FC-SMA are 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 specific fiber properties and is not Gaussian for PCF fibers.

An optics for each application
A large variety of collimating optics allows that the optimum focal length and the best lens type for a single wavelength (asphere, monochromat, singlet) or a wavelength range (achromat) can be selected for each application. All lenses are AR-coated.

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 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 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 collimators have a receptacle of of type SMA-905 (F-SMA) and is available for 5° or 8° e.g. for SMA-905 High Power connectors (receptacles for fibers with 0°-polish on request). 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.

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

Mounting
The collimator can be placed into a standard mirror mount.

FAQ

  • Fiber Collimators with receptacle type SMA
    • Why do we not offer fiber couplers without TILT alignment and a receptacle type F-SMA with an angled polish?

      The fiber connectors of type SMA do not have a spring-loaded ferrule (such as FC type connectors do).

      The receptacles do not have a limit stop.
      Since the length of the ferrule is not defined precisely, the emitting point in the fiber coupler is not properly defined.

      In case of a 0°-polish this is not a problem since you can adjust for this by adjusting the axial lens position.

      However, in case of an SMA fiber connector with an angled polish, the emitting point additionally moves laterally with ferrule length.

      In order to compensate for this lateral displacement, a TILT alignment is absoluetely necessary. 

  • Adjustment
    • How much can I change the focus setting?
      You can change the focus setting ± 2.0 mm. 
    • I do not have a collimating telescope to collimate. Can you give me practical advice?
      Of coarse, a collimating telescope is the best way to collimate. But there are other methods depending on the type of fiber (single-mode and PM vs. multimode) you can use. Please refer to our practical collimating tips here.
    • I am unsure how to correctly adjust my coupler/collimator. Where do I find details about the adjustment procedure?
      Please refer to the manual in the Downloads section for a detailed adjustment procedure.
  • Troubleshooting
    • I can‘t collimate the radiation out of a coupler. Why?
      • Have you loosened the grub screws?
        The clamp screws have to be loosened before changing the focus setting, Please refer to the adjustment instructions of the individual couplers for more details.
      • Have you checked, if the fiber is correctly placed within the fiber receptacle of the coupler?
        The fiber connector might not be placed correctly within the receptacle of the coupler. In particular, please check the small grub screw holding the connector's ferrule (e.g. for FC PC and FC APC type couplers). It might be in the way. Please refer to the adjustment instructions of the individual couplers for more details.
      • Are you using the optimum groove for adjusting the focus setting with the eccentric key?
        The distance lens to fiber end face is changed by means of an eccentric key. This key has a pin. The lens tube has one (or more) circumferential groove(s). The lens tube is shiftet axially by rotating the eccentric. 

        In order to cover the entire adjustment range, it might be necessary to switch from one to the next circumferential groove. 

        Sometimes it is easier to do a coarse alignment by shifting the rear part manually (instead of using the eccentric key). Then, the right groove for a proper fine adjustment with the eccentric will appear in the aperture of the fiber collimator for the eccentric and you can finish the fine adjustment using the eccentric key.

      • Have you checked the eccentric key for damage?
        The eccentric key might be damaged or broken. If that is the case, try another eccentric key of the same type and (or) contact Schäfter+Kirchhoff for replacement.

Accessories

for collimators

Micro Focus Optics for Fiber Collimators of all series

Retardation optics for fiber collimators