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Rubidium vapor is loaded into hypocycloidal core shaped Kagome hollow-core photonic crystal fiber (HC-PCF) with the wall of its inner core coated with aluminosilicate ceramic (sol-gel). We show that the presence of Rb vapor is maintained for a longer duration when compared to uncoated Kagome HC-PCF. Rb vapor within the hollow-core of a sol-gel coated Kagome HC-PCF is preserved for over 500 h after the source of Rb is halted. And Rb vapor is detected in the sol-gel coated HC-PCF for more than 80 h after the background Rb vapor signal is no longer observed. [ABSTRACT FROM PUBLISHER]

We report on numerical and experimental results on macro bending losses in single-cell Kagome-lattice hollow-core photonic crystal fibers. Fibers with different cladding layer numbers have been investigated. Results show that a cladding with at least two rings produces a reduction in bend sensitivity by more than one order of magnitude relative to a single layer cladding. This result is an original way to confirm the main role played by the inhibiting coupling mechanism in such microstructured fibers. [ABSTRACT FROM PUBLISHER]

We report on a technique to pattern the shape of the core surround of a hollow-core photonic crystal fiber. Different shapes are fabricated and a relationship between surface mode location and core surround thickness is experimentally observed. [ABSTRACT FROM PUBLISHER]

Optical feedback from the Fresnel reflection at the air-silica interface of a splice between a hollow core photonic crystal fiber (HC-PCF) and a conventional fiber can cause laser instability or damage. The reported solution consists of the preparation of angle cleaved fibers, spliced together using a filament fusion splicer. A reduction of 44 dB of the return loss is observed. The method will considerably reduce potential damage such as fiber fusion in case of a fiber laser. The method is also demonstrated to decrease the Fabry-Perot effect in setups such as saturable absorption when the spliced HC-PCF is used as a gas cell device. [ABSTRACT FROM PUBLISHER]