| 摘要 |
PROBLEM TO BE SOLVED: To suppress a scattering of excitation light in an optical fiber at the time of the introduction of the excitation light into the optical fiber, and also to relax the condition of the constitution of an excitation light reflective part in a laser beam generating device which performs the generation of a laser beam and an amplification of signal light by the introduction of the excitation light into the optical fiber, and an optical amplifier. SOLUTION: One link of an optical fiber 2 using a laser active material as its core is folded back a plurality of times, the parts, which are held between the folded- back parts, of the fiber 2 are respectively arranged on a straight line, these straight line parts are arranged in almost parallel to each other, whereby the plane of the fiber 2 is formed and this plane is pinched in between two glass flat plates 5 to fuse the plane to the flat plates 5. At this time, both ends of the fiber 2 are arranged on the outsides of the flat plates 5 and a reflecting mirror 3 is mounted on the one end on one side of both ends of the fiber, which are arranged on the outsides of the flat plates. Prisms 4a and 4b for introducing excitation light/in the fiber 2 are arranged into the form of the plane of this fiber 2, and the light 7 is introduced in the fiber 2 toward the longitudinal direction of the fiber 2 via these prisms 4a and 4b. The fiber 2 introduced with the light 7 generates a laser beam and the generated laser beam is taken out from the one end on one side of the ends of the fiber 2. |
