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Influence of bending diameter on output capability
of multimode fiber laser |
| LI Libo1, LOU Qihong2, ZHOU Jun2, DONG Jingxing2, WEI Yunrong2, LI Jinyan3 |
| 1.Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences；Graduate University of Chinese Academy of Sciences; 2.Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences; 3.FiberHome Telecommunication Tech Co Ltd |
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Abstract The output capability of large mode area (LMA) multimode fiber laser depends on the fiber bending. To study the relationship, the output capability of multimode fiber laser was measured under various bending diameters, and it was also theoretically calculated. Measured respectively were the beam quality factor M2, by means of knife edge for the different bending diameters of LMA fiber, and the slope efficiency. When the bending diameters 285, 195 and 130 mm were used, the corresponding beam quality factors were 2.88, 1.82 and 1.67 with the slope efficiency at 39%, 35% and 34%, respectively. In addition, for the LMA multimode fiber used in the experiment, losses of different modes were calculated theoretically under various bending diameters. The experimental results correspond to the calculated results.
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Issue Date: 05 June 2008
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