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Laser Beam Couplers Series 60SMS
Laser Beam Couplers Series 60SMS
The Schäfter+Kirchhoff laser beam couplers launch a laser beam into, or from a polarization-maintaining
single-mode fiber. This document provides assistance in installing and adjusting the laser beam couplers
series 60SMS. It describes how a fiber cable is attached, and how a fiber coupling is optimized.
1.
Before You Start
The laser beam coupler is shipped with a protection cap for the fiber receptacle and with a front cap.
Notice:
There is a two-part protection cap on the receptacle. Please perform the following steps in order to remove
this cap:
Adjustment_60SMS
10.12.2020
Schäfter+Kirchhoff GmbH Kieler Str. 212 22525 Hamburg, Germany
Please remove all the protection caps first and do not use them as beam
dumps (risk of photo contamination).
© Schäfter+Kirchhoff GmbH
Figure 1:
First, remove the threaded cap from
the fiber receptacle of the laser beam
coupler.
Figure 2:
Then, slightly loosen the small pin
screw. Use the screwdriver 9D-12.
Make sure to not loosen it too far, as it
is small and easily lost.
Figure 3:
Now, pull out the plug.
+49 40 85 39 97-0 info@sukhamburg.de www.sukhamburg.com
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Summary of Contents for Schäfter+Kirchhoff 60SMS Series
- Page 1 Laser Beam Couplers Series 60SMS Laser Beam Couplers Series 60SMS The Schäfter+Kirchhoff laser beam couplers launch a laser beam into, or from a polarization-maintaining single-mode fiber. This document provides assistance in installing and adjusting the laser beam couplers series 60SMS. It describes how a fiber cable is attached, and how a fiber coupling is optimized. Before You Start The laser beam coupler is shipped with a protection cap for the fiber receptacle and with a front cap.
- Page 2 Laser Beam Couplers Series 60SMS Now, make sure that the connector of the fiber you want to attach matches the receptacle type of the laser beam coupler: • Use fibers with FC-APC (8°-polish) connectors for laser beam couplers with an inclined coupling axis (60SMS-4).
- Page 3 Laser Beam Couplers Series 60SMS Figure 6: Then, orient the connector key in a way that it is pressed gently onto the right-hand side of the receptacle notch. Figure 7: Gently screw on the connector cap nut onto the receptacle until it is finger-tight.
- Page 4 Laser Beam Couplers Series 60SMS Adjusting the Focus Setting Focus adjustment (adjustment of the coupling lens in z-direction) is a demanding task and should be performed preferably using a collimating telescope. Notice: The laser beam coupler is shipped pre-adjusted for the labeled wavelength and, often, it is not necessary for the customer to readjust the coupling lens position.
- Page 5 Laser Beam Couplers Series 60SMS Figure 10: Insert the eccentric key type 60EX-4 or type 60EX-5 into the large hole. Figure 11: Now, adjust the focus setting by ro- tating the eccentric key. Adjust the collimation by minimizing the size of the laser spot on the target about half the Rayleigh length z away.
- Page 6 Laser Beam Couplers Series 60SMS Adapter for the Lateral Adjustment The laser beam coupler can be connected to your laser system or optical bench by using an adapter flange or it can be attached directly to a multicube element from Schäfter+Kirchhoff. It is very important for an efficient coupling that the laser beam passes the aperture of the laser beam coupler centrally.
- Page 7 Laser Beam Couplers Series 60SMS Figure 15: Laterally shift the adapter in order to maximize the radiation that is trans- mitted by the aperture. Only a coarse alignment is necessary, which can be done by hand (Figure 15), as the positioning accuracy must only be a fraction (7 - 10 %) of the collimated beam diameter.
- Page 8 Laser Beam Couplers Series 60SMS Connecting the Laser Beam Coupler to Your System Before you install the laser beam coupler we recommend to measure the output power of the laser as a reference for the next steps. Now, perform the following steps: Figure 17: Locate the three radially arranged tapered pin screws in the adapter...
- Page 9 Laser Beam Couplers Series 60SMS Figure 19: The flat part (dashed line) has to be perpendicular to the polarization axis of the laser. Figure 20: Now fix the three tapered pin screws at the adapter flange. please use the same torque of about 0.48 Nm for all three pin screws, respectively.
- Page 10 Laser Beam Couplers Series 60SMS Tilt Adjustment: Finding a Signal When coupling into single-mode fibers, the laser beam couplers should produce a diffraction-limited spot at the fiber end-face that matches the mode field diameter and - at the same time - the divergence of the fiber. Fiber-coupling with high coupling efficiency can only be achieved when this condition is met.
- Page 11 Laser Beam Couplers Series 60SMS If no signal at all is found then the signal area can be increased by slightly loosening the threaded collar of the FC connector and slightly pulling back the fiber connector. This increases the diameter of the laser spot at the fiber end-face.
- Page 12 Laser Beam Couplers Series 60SMS should always reduce the coupling efficiency. If the coupling efficiency increases by pressing in one direction, the locking screw shifting the fiber position into the desired direction has to be tightened further, see Figure 24. Figure 24: Thumb test: Pressing of the fiber connector in the shown direction has...
- Page 13 Laser Beam Couplers Series 60SMS Figure 27: Finally, lock the focus setting by fixing the two grub screws using the screwdriver type 9D-12. 11. Alignment of the Fiber Polarization Axis When coupling a laser beam into a polarization-maintaining single-mode fiber, the polarization axis of the fiber must be aligned with respect of the polarization axis of the source in order to obtain a high polarization extinction ratio.
- Page 14 Laser Beam Couplers Series 60SMS analyzer, such as the SK010PA Polarization Analyzer from Schäfter+Kirchhoff. Figure 30: Finally, fix the three radially arranged pin screws at the adapter. Please consider a comparable torque for the three screws and the gap of the steel ring such as described in Chapter 5.
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Page 15: Adjustment Tools
Laser Beam Couplers Series 60SMS 13. Accessories Figure 31: Adapter type 60A19-5-F. Other adapter types are available. 14. Adjustment Tools For assembling and adjusting the laser beam couplers series 60SMS you need the following tools: Figure 32: Screw driver type 9D-12, hex key 50HD-15, and eccentric key type 60EX-4 or type 60EX-5. - Page 16 Laser Beam Couplers Series 60SMS Copyright • © Unless expressly authorized, forwarding and duplicating of the document and the utilization and communication of its contents are not permitted. Violations will entail an obligation to pay compensation. • All rights in the event of granting of patents or registration of a utility model. •...
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