Journal
LASER PHYSICS
Volume 26, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1054-660X/26/1/015104
Keywords
multicore; all-solid laser; photonic crystal fiber; refractive index mismatch; soft glasses
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We demonstrate a single-mode seven-core Nd-doped phosphate photonic crystal fiber with all-solid structure with an effective mode field diameter of 108 mu m. The multicore fiber is first theoretically investigated through the finite-difference time-domain method. Then the in-phase mode is selected experimentally by a far-field mode-filtering method. The obtained in-phase mode has 7 mrad mode field divergences, which approximately agrees with the predicted 5.6 mrad in seven-core fiber. Output power of 15.5 W was extracted from a 25 cm fiber with slope efficiency of 57%.
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