20100195678 | APPARATUS FOR COUPLING LIGHT INTO AN OPTICAL WAVE GUIDE, A LASER SYSTEM WITH SUCH AN APPARATUS, AND A PREFORM TO MANUFACTURE THE APPARATUS - The invention relates to an apparatus for coupling light into an optical wave guide, a laser system with such an apparatus, and a preform to manufacture the apparatus for coupling light into an optical wave guide with the aid of a pumping fiber to guide the light, whereby the optical wave guide comprises a core with a cladding and an initial length segment with a second length segment immediately connected to it, whose cross section increases in tapered form with respect to the first length segment. In order to make a powerful apparatus and thereby a powerful laser system available, including the corresponding preform, it is recommended that the core and cladding of the optical wave guide run continuously through the first length segment and the second length segment, that the end of the pumping fiber embedded in the cladding of the second length segment runs along the cladding and emerges from the forward face out of the end of the second length segment, and that the cross section of the cladding increases in tapered form. Preferably, the cross section of the pumping fiber increases together with the cross section of the second cladding. | 08-05-2010 |