NOVELTY - The method comprises arranging optical fibers (121) in a fiber section, establishing an integral joint between the arranged optical fibers within the fiber section, and cutting the optical fibers within the fiber section, where the light source comprises a diode laser having emitters (131), and a light guiding device (12) having optical fibers, each of which has a first end (1211) and a lateral surface (1217). The first ends are arranged in such a way relative to the emitters that light generated by the emitters is injected into the first ends of the optical fibers.    USE - Method for the production of light source for optically exciting a laser device of a laser ignition system in an internal combustion engine.    ADVANTAGE - The method ensures efficient and economical production of light source with improved mechanical properties by reducing optical losses.    DETAILED DESCRIPTION - The method comprises arranging optical fibers (121) in a fiber section, establishing an integral joint between the arranged optical fibers within the fiber section, and cutting the optical fibers within the fiber section, where the light source comprises a diode laser having emitters (131), and a light guiding device (12) having optical fibers, each of which has a first end (1211) and a lateral surface (1217). The first ends are arranged in such a way relative to the emitters that light generated by the emitters is injected into the first ends of the optical fibers. The optical fibers are arranged edge to edge along the lateral surfaces in the area of the first ends of the optical fibers. The fibers are heated for the production of direct or indirect connection between the optical fibers. The optical fibers are arranged in the fiber section along its side surface of the base. The softening of the optical fiber and/or shaping of the fiber is carried out. The optical fibers are arranged in the area of the fiber section on the fiber support. A power is applied on the optical fiber for the production of connection between the optical fibers and is directed vertically to the support area of the optical fiber on the fiber support. The fiber support is cut during cutting the deformed optical fiber. The fiber support connected with the optical fiber is cut during cutting the arranged optical fiber. The connection is a material-fit connection and a direct material bond is prevented between the optical fibers. The optical fibers are arranged between the fiber support and a counter area during applying the power on the optical fiber, which is pressed between the counter area and the fiber support. The counter area consists of a heat-resistant material such as silicon carbide that receives connections with the optical fiber at 800 degrees C. The counter area is a part of a second fiber support, which connects with the optical fiber in material-fit manner. The second fiber support connected with the optical fiber is cut during cutting the optical fiber. The optical fibers completely fill the area between the fiber support and the counter area on the width in which the optical fibers are arranged on the fiber support, after the deformation of the optical fiber to 95% or to 90-99%. The cutting of the arranged optical fibers is carried out within the fiber section in a direction that forms an angle of 89-91 degrees with the longitudinal axis of the optical fiber. The fiber section lies in area of the middle of the optical fiber so that the fibers are divided into two equal length fiber pieces during cutting. The cutting of the optical fiber is carried out by a carbon dioxide laser.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a light source.    Light guiding device (12)    Optical fiber (121)    Emitter (131)    First end (1211)    Lateral surface. (1217)