DEVICE FOR INJECTING THE LIGHT ENERGY OF A LASER BEAM INTO A FIBRE-OPTIC OPTICAL WAVEGUIDE AND A METHOD FOR ADJUSTING AND MONITORING THE POSITION OF THE END OF THE FIBRE-OPTIC OPTICAL WAVEGUIDE

摘要

In a device for injecting the light energy of a laser beam into a multimode fibre-optic optical waveguide (2) a small part of the light emerging from the end face o f the optical waveguide (2) is projected through a beam splitting cube (7) and a reproduci ng lens (21) onto a display screen (1), so that an image (24) of the end face of the optical waveguide (2) can be observed on the display screen (1). The arrangement is such that the system is correctly focused only when the distance between the optical waveguide (2) a nd a focusing point of the laser beam (12) reaches an intended value. The light spot of the laser beam on the end face of the optical waveguide (2) is clearly visible on the display screen (1) so that an optimum positioning and adjustment can be readily effected.