Optical fiber microstructuration for strengthening single-mode laser operation in high power regime

in: Optical Engineering (2014)
Benoît, Aurélien; Dauliat, Romain; Schuster, Kay; Grimm, Stephan; Jamier, Raphael; Salin, François; Roy, Philippe
We propose here an in-depth investigation of all-solid microstructured optical fibers for the development of Very Large Mode Area (VLMA) fiber lasers. The inner cladding microstructuration of these VLMA fibers is carefully optimized in order to get a robust singlemode laser operation in the high power regime. In this article we describe the numerical approach used to devise novel kind of fiber structures, the core of which should be larger than 50μm while showing an improved singlemode emission compared to that of the state of the art Large Pitch Fibers (LPFs). With the aim of over passing the limitations of CVD techniques, we opted for an innovative manufacturing process called « Repusil » based on the sintering and vitrification of doped powders. Then, our opto-geometrical considerations result from the optical properties offered by this method and the use of the stack and draw. Finally, we present our very first fabrication for proposed all-solid microstructured fibers in which a laser emission of 52W in a continuous wave regime was obtained.

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