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Recently developed methods for high resolution birefringence measurement have been applied to distinguish between the surface and interior birefringence of silica glass fibers as a function of drawing temperature and initial surface condition for two types of silica glass with different water contents. Fibers were drawn in a water‐free argon environment using graphite heating elements. It was found...
We report the effectiveness of multiple-cladding-resonance photonic bandgap fiber for suppressing mode instability by demonstrating pump-limited single-mode output power of ∼1kW in a 60μm-core fiber, a record for any fiber lasers at this core diameter.
We report ytterbium-doped LMA fibers with ∼30μ and ∼40μ cores and a recordlow NA of 0.028, i.e. ΔN=2.7times;10−4 critical for overcoming transverse-mode-instability threshold in single-mode fiber lasers and made possible by an innovative fabrication process.
We demonstrated both theoretically and experimentally robust single-mode operation in all-solid photonic bandgap fibers with record effective mode areas of ∼2650μm2 by introducing multiple strongly coupled smaller cores in the cladding.
Flat-top beam is demonstrated in a 50µm-core leakage channel fiber using a central ytterbium-doped area with an index depression of ∼2×10−4, resulting in an effective mode area of ∼1880µm2, i.e. >50% increase from uniform core.
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