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A three year Knowledge Transfer Partnership between @UK plc, University of Reading and Goldsmiths College, London produced an e-procurement system called SpendInsight which the National Audit Office reports could save the NHS Σ500 million per annum. An extension to the system, GreenInsight, enables procurers to assess the environmental impact of their purchases and hence make savings there. Key to...
Five 7-cell core hollow-core fibers with photonic bandgap spectral positions between 1.4 mum and 2.3 mum were fabricated. The loss follows the ap lambda-3 dependency previously reported with a minimum measured loss of 9.5 dB/km at 1992 nm.
We observe for the first time the simultaneous emission of two resonant radiation frequencies by optical solitons in a small waveguiding glass-feature within the cladding of a HC-PCF. We attributes this phenomenon to the unusually large 4th-order GVD coefficient of the waveguide.
We report on the design, fabrication and characterization of hollow-core photonic crystal fiber with two robust bandgaps that bridge the benchmark laser wavelengths 1064 nm with 1550 nm, and 1064 nm with 780 nm.
Antiresonant core walls in 7-cell hollow core fibers are used to reduce the attenuation to 9.3dB/km and create an intentionally highly birefringent fiber with a beatlength as low as 0.2mm
Antiresonant core walls in 7-cell hollow core fibers are used to reduce the attenuation to 9.3dB/km and create an intentionally highly birefringent fiber with a beatlength as low as 0.2mm
The numerical methods available for calculating the electromagnetic mode properties of photonic crystal fibres are reviewed. The preferred schemes for analyzing TIR guiding and band gap guiding fibres are contrasted.
A new kind of hollow core photonic crystal fiber (HC-PCF) for broadband guidance is introduced. Structural and optical properties of a fabricated example are detailed.
We report on strong nonlinear effects in a specific sub-micron scale silica-node within the cladding of a hollow-core photonic crystal fiber at frequencies lying within the air-guiding cladding photonic bandgap.
Dispersive pulse compression in a hollow-core photonic bandgap fiber is studied numerically. The limits to peak power for high pulse quality arising from fiber nonlinearities are investigated, along with the validity of approximate scaling relations.
We report on fabricated all-solid fibers which guide by a combination of bandgap and TIR mechanisms. The fibers show high birefringence and possess a dispersion characteristic similar to the pure bandgap guiding form.
We observe the effects of anti-crossing events between core and core interface guided modes of a HC-PCF, by monitoring the output of the fiber as the coupled laser is scanned in wavelength.
Large pitch square-lattice hollow core photonic crystal fibers have been fabricated. Measurements show that the fiber exhibits similar optical linear properties to the Kagome fiber.
Antiresonant core walls in 7-cell hollow core fibers are used to reduce the attenuation to 9.3 dB/km and create an intentionally highly birefringent fiber with a beatlength as low as 0.2 mm.
The dispersion of a broadband-guiding hollow core photonic crystal fiber, possessing a Kagome cladding structure, can be adversely influenced by weak residual mode interactions. The impact on pulse propagation is explored.
A 3-octave spectral comb is generated in a hydrogen-filled hollow-core photonic-crystal-fiber. The spectrum consists of up to 45 high-order Stokes and anti-Stokes lines generated by coherent stimulated Raman scattering in the transient regime of amplification.
A Fresnel zone imaging technique at the output of a short length of hollow core photonic crystal fiber allows the identification of the photonic crystal cladding Bloch-modes. The experimental results show excellent agreement with theory.
The cladding-modes adjacent the photonic bandgap of a hollow-core photonic crystal fiber are identified. The results show that the bandgap is due to three types of resonators: the glass-apex, the silica- strut, and the air hole.
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