5 April 2016 Yb-doped large mode area fibers with depressed clad and dopant confinement
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Large mode area fibers with depressed-index cladding layer and confinement of rare-earth dopants can provide effective suppression of high-order modes. A polarization-maintaining Yb-doped double-clad fiber with 35/250 μm core/clad diameter has been fabricated from conventional methods according to this design. The fiber which has an effective mode area close to 500 μm2 yields near diffraction-limited output with beam quality factor M2 close to 1.1 when tested as a power amplifier with a coherent seed light source. Beam pointing measurements provide further evidence for near single-mode behavior as the pointing fluctuations are shown to be negligible once the fiber is coiled to a given diameter.
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Vincent Roy, Vincent Roy, Claude Paré, Claude Paré, Pierre Laperle, Pierre Laperle, Louis Desbiens, Louis Desbiens, Yves Taillon, Yves Taillon, "Yb-doped large mode area fibers with depressed clad and dopant confinement", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97281W (5 April 2016); doi: 10.1117/12.2212770; https://doi.org/10.1117/12.2212770

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