Anti-Resonant Hollow Core Fibers (AR-HCFs) are an emerging technology with a number of applications in low-latency communications, mid-IR transmission, and power delivery. Current R&D applications of AR-HCFs utilize free-space optics to obtain results in a timely and cost-effective manner. However, this approach exposes the HCFs to contaminants entering the HCF microstructures and if unmitigated can cause loss and potentially damage to the fiber. End-capping HCFs can protect the interfaces from damage, dust, and debris while simultaneously increasing their robustness and allowing for long-term use. Here, we present a novel endcap technique that allows low-loss transmission through a robust end-capped AR-HCF.
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