| 摘要 |
PURPOSE:To prevent transmission efficiency from decreasing by a stable end surface by making laser beam incident on one end of an optical fiber which converges power laser beam and pressing a material of the same or different kind from the optical fiber against the other end surface of the optical fiber, and thus forming and connecting the end surface of the optical fiber. CONSTITUTION:A laser beam irradiating device uses a power laser to perform a surginal operation and the cutting and boring of a metallic workpiece, and has a flexible optical fiber cable incorporating the optical fiber for power laser transmission. The laser beam 4 is incident on one end of the optical fiber 3 through a condenser lens 5, and the optical fiber 3 is held on a block 6 and has a pressure plate 7 with a mirror surface 7' on its end surface. An uneven- surface pressure plate 8 which produces lens effect is arranged atop of the optical fiber 3 and a thermocouple 9 is fitted nearby the end surface formation part of the optical fiber 3; and the temperature at the periphery of the end surface of the optical fiber 3 is measured and its signal is sent to a laser controller 10 to control the laser light incident on the optical fiber 3.
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