The 60SMF series from Schäfter + Kirchhoff GmbH are Fiber Optic Couplers that have focal lengths up to 18 mm. They have coupling efficiencies of 80% and power stability of 3%. These couplers have an integrated TILT, focusing adjustments, and allow 360° freedom of rotation. They have fine-threaded adjustment screws for coupling into single-mode and polarization-maintaining fiber cables. These couplers have AR-coated lenses and support FC/PC or FC/APC, ST & LSA, or mini AVIM connectors. They are available in eco brass (standard) or magnetic titanium material with a system mount of Ø 19.5 mm and are ideal for compact & long-term stable coupling of single-mode laser radiation into a single-mode or polarization-maintaining fiber.