Large-pitch kagome-structured hollow-core photonic crystal fiber

Abstract

We report the fabrication and characterization of a new type of hollow-core photonic crystal fiber based on large-pitch (approximately 12 microm) kagome lattice cladding. The optical characteristics of the 19-cell, 7-cell, and single-cell core defect fibers include broad optical transmission bands covering the visible and near-IR parts of the spectrum with relatively low loss and low chromatic dispersion, no detectable surface modes and high confinement of light in the core. Various applications of such a novel fiber are also discussed, including gas sensing, quantum optics, and high harmonic generation.

Finite element simulation of radiation losses in photonic crystal fibers

“…Computational results agree well with experimental transmission spectra measured in [5]. In the context of topics related to the DFG priority programme photonic crystals, we have applied adaptive finite element algorithms to a variety of nano-optical problems [8,9,10,11,12,13,14,6,15].…”

“…We choose t = 152 nm since here ℑ(n eff ) has a global minimum and Λ = 1550 nm since the bandwidth of this minimum is much larger than for the global minimum at Λ = 1700 nm. Optimization yields a minimum value of ℑ(n eff ) = 5 · 10 8 Kagome-structured fibers In [5] attenuation spectra of large-pitch kagome-structured fibers have been measured experimentally. Fig.…”

“…Since we only take into account radiation losses we do not expect quantitative agreement with experimental measurements. Discussions about other loss mechanism can be found in [12,5]. We fix the geometrical parameters of the fiber and search for leaky eigenmodes in a wavelength interval.…”

Finite Element Simulation of Radiation Losses in Photonic Crystal Fibers

“…We expect that well confined modes have small losses. For simulation we use layouts corresponding to [5] shown in Fig. 3(b) and 9(c) with parameters given in Table 2.…”

Hollow-core photonic crystal fibre for high power laser beam delivery

“…At the birth of this fibre, its guidance mechanism was not well understood, which hindered further advances in terms of its propagation loss and transmission bandwidth. Since 2006, Kagome-type HC-PCF has experienced a strong development in both experimental fabrication [26][27][28] and physical understanding [29,30] . It was shown that this type of fibre favours a large pitch and guides via inhibited coupling between the core modes and the cladding modes.…”