17 May 2018 Transverse mode selection in diode-pumped multimode fiber Raman lasers
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We report on the transverse mode selection in an all-fiber CW Raman laser based on a multimode graded-index fiber directly pumped by multimode laser diodes. Selection properties of special fiber Bragg gratings inscribed by UV CW or IR femtosecond radiation in the 100-μm core of graded-index fiber are experimentally compared. It is also theoretically explained why the better fundamental mode selection occurs in the femtosecond fiber Bragg grating inscribed in the fiber with lower core diameter. Fibers with core diameter of 62.5, 85 and 100 um are compared in the experiment. With core enlargement, the output power and slope efficiency increase sufficiently (from 47% to 84%) at the expense of slight beam-quality parameter increase (M2 =1.3-3).
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Ekaterina A. Zlobina, Ekaterina A. Zlobina, Sergey I. Kablukov, Sergey I. Kablukov, Alexey A. Wolf, Alexey A. Wolf, Ilya N. Nemov, Ilya N. Nemov, Alexandr V. Dostovalov, Alexandr V. Dostovalov, Sergey A. Babin, Sergey A. Babin, "Transverse mode selection in diode-pumped multimode fiber Raman lasers ", Proc. SPIE 10683, Fiber Lasers and Glass Photonics: Materials through Applications, 1068334 (17 May 2018); doi: 10.1117/12.2307309; https://doi.org/10.1117/12.2307309

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