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Abstract: We demonstrate the fabrication of a high-quality fiber Bragg grating (FBG) in a large mode area passive double-clad fiber (DCF) using femtosecond laser multi-layer line-by-line inscription.

Snowflakes are fragile masterpieces. They’re strong enough to shut down entire cities when they band together, but individually they can melt to liquid rain at the slightest rise in temperatures.