Abstract
In this Letter, we report, to the best of our knowledge, the largest effective single-mode mid-infrared chalcogenide (ChG) fiber. Two thermally matched ChG glasses with a large index contrast of ∼0.35 are chosen for constructing all-solid photonic crystal fiber (PCF) with two rings of "holey" microstructured cladding. Single-mode operation is confirmed in the fabricated ChG PCF with a core diameter of 91.2μm, from both near-field and far-field observation at 4μm. Ultralow numerical aperture of <0.025 has been observed at wavelengths between 2.5 and 4.0μm. The fundamental mode area is calculated to be 5200 μm2 at 4μm, where the propagation loss of the ChG PCF is measured to be 5.2dB/m. Broadband 3.5 and 7.5μm supercontinuum has been generated in a 35-cm-long ultralarge-mode-area PCF.
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