Schaefter + Kirchhoff fiber collimators have utility as fiber couplers
Series 60FC-SF fiber collimators with super-fine thread can be used as collimators for a single-mode fiber or as fiber couplers with high pointing stability. The distance between fiber end-face and collimating optics is adjusted using a threaded ring with 0.35 mm pitch. This leads to increased pointing stability and reduced backlash during focus setting.
Schaefter + Kirchhoff
Hamburg, Germany