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Laser Beam Couplers Series 60SMF-LSA
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 60SMF-LSA. 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 polymer cap on the receptacle. Please perform the following steps in order to remove this cap:
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 APC (8°-polish) connectors for laser beam couplers with an inclined coupling axis
(60SMF-LSA-4).
• Use fibers with PC (0°-polish) connectors for laser beam couplers with a coaxial axis
(60SMF-LSA-0).
The laser beam couplers are compatible to all fiber connectors of type LSA, DIN, AVIO and AVIM.
Adjustment_60SMF-LSA
20.05.2021
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 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.
+49 40 85 39 97-0 info@sukhamburg.de www.sukhamburg.com
1
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Summary of Contents for Schäfter+Kirchhoff 60SMF-LSA Series
- Page 1 Laser Beam Couplers Series 60SMF-LSA 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 60SMF-LSA. 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 Notice: • Do not touch either the optical surface of the lens or the fiber end-face. • If the coupler is not in use, reattach both rear and front protection caps. Caution! Refer to the laser instruction manual for all instructions regarding laser safety! •...
- Page 3 Figure 6: Gently screw on the connector cap nut onto the receptacle until it is finger-tight. Notice: In case of fiber connectors of type AVIM we recommend to fasten the hex nut of the connector with a torque of 0.3 Nm. Figure 7: Finally, gently tighten the fiber grub screw to reduce the free play of the...
- Page 4 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 Figure 9: Insert the eccentric key type 60EX-4 or type 60EX-5 into the large hole. Figure 10: 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 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 Figure 14: 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 14), as the positioning accuracy must only be a fraction (7 - 10 %) of the collimated beam diameter. Figure 15: Finally, fix the adapter and remove the aperture.
- Page 8 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 16: Locate the three radially arranged tapered pin screws in the adapter flange (Figure 17) and loosen them using the hex screwdriver 50HD-15.
- Page 9 Figure 18: The small grub screw has to point into the direction to the polarization axis of the laser (dashed line). Figure 19: 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 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 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 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 23. Figure 23: Thumb test: Pressing of the fiber connector in the shown direction has the same effect such as fastening the marked locking screw...
- Page 13 Figure 26: 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 analyzer, such as the SK010PA Polarization Analyzer from Schäfter+Kirchhoff. Figure 29: 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. Adjustment_60SMF-LSA 20.05.2021 ©...
- Page 15 13. Accessories Figure 30: Adapter type 60A19-5-F. Other adapter types are available. 14. Adjustment Tools For assembling and adjusting the laser beam couplers series 60SMF you need the following tools: Figure 31: Screw driver type 9D-12, hex key 50HD-15, and eccentric key type 60EX-4 or type 60EX-5.
- Page 16 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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