Diode-pumped all-fiber Raman lasers with high beam quality

Sergey A. Babin; Ekaterina A. Zlobina; Sergey I. Kablukov; Alexey A. Wolf; Ilya N. Nemov; Alexandr V. Dostovalov; V. A. Tyrtyshnyy; D. V. Myasnikov

doi:10.1117/12.2289862

26 February 2018 Diode-pumped all-fiber Raman lasers with high beam quality

Sergey A. Babin, Ekaterina A. Zlobina, Sergey I. Kablukov, Alexey A. Wolf, Ilya N. Nemov, Alexandr V. Dostovalov, V. A. Tyrtyshnyy, D. V. Myasnikov

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Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 105121V (2018) https://doi.org/10.1117/12.2289862
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

We report on the first all-fiber CW Raman laser based on a multimode graded-index fiber directly pumped by multimode laser diodes. A joint action of Raman clean-up effect and mode-selection properties of special fiber Bragg gratings inscribed in the central part of fiber core, results in high-efficiency conversion of a multimode (M²~26) pump at 915 nm into a high-quality output beam at 954 nm. Fibers with core diameter of 62.5, 85 and 100 um are compared. With core enlargement, the output power and slope efficiency increase sufficiently (from 47% to 84%) at the expense of slight beam-quality parameter reduction (M²=1.3-3).

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Sergey A. Babin, Ekaterina A. Zlobina, Sergey I. Kablukov, Alexey A. Wolf, Ilya N. Nemov, Alexandr V. Dostovalov, V. A. Tyrtyshnyy, and D. V. Myasnikov "Diode-pumped all-fiber Raman lasers with high beam quality", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121V (26 February 2018); https://doi.org/10.1117/12.2289862

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