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Recent publications
Recent publications
The direct interconnection of a hollow-core fiber (HCF) to a laser diode or photodiode is essential to full exploitation of the unique characteristics of HCFs. This is straightforward and common place for solid core fibre counterparts, but this work has not yet been done for HCFs. In this paper, we investigate two specific methods for HCF interconnection (i.e., butt coupling and simple two-lens imaging) for coupling light from a single-mode vertical-cavity surface-emitting laser (VCSEL) operating at 850 nm (an important wavelength for data centres).
Hollow core fibres are an ideal candidate for UV guidance, as solid core silica counterparts are damaged over time by solarization. In practice, achieving UV HCFs is not straight-forward as they require very thin microstructures. We demonstrate an optical fibre we fabricated that can guide most of the UV band from 190 nm - 400 nm, with one resonance in at 250 nm. This is the first fibre with long yields of its type.
Postdoctoral research highlights
Postdoctoral research highlights
Work as a post-doctoral researcher I find neat and would probably bring up in a conversation...
An easy to assemble , affordable and motorised monolithic 3D-printed plastic flexure stage with sub-100 nm resolution that can perform automated optical fibre alignment.
Fabricators are working on eliminating the gap between low-loss achievable in single-mode solid core fibres to what can be achieved in hollow core fibres. The fibre reported here presents a record-low 0.28dB/km loss from 1510 to 1600nm.
PhD work Highlights
PhD work Highlights
Some of science research I have worked on as a PhD that I find particularly neat and like to show off!
A novel optical fibre with a mode field distribution independent of the fiber’s size and so remains the same along a taper. This leads to adiabatic and low-loss transitions no matter the taper length.
A doped silica multi-core imaging fibre with air-filled cladding. Its imaging quality is shown to be a substantial improvement over the commercial state of the art, with comparable resolution over an unparalleled spectral range.
All-fibre pseudo-slit reformatters made for to reduce modal noise in spectroscopy. We male them either by tapering bundles of single-mode fibres or by postprocessing a photonic crystal fibre. These devices convert the modes of a multimode core to the modes of a linear pseudo-slit output structure, achieving a diffraction limited pattern in one direction.
Shack-Hartmann wavefront sensors are commonly used to detect wavefront aberrations from point sources, for example when imaging stars in the sky that have been affected by atmospheric turbulence.
We designed a quantitative characterization method for endoscopic imaging fibers using an interference pattern as the standard object to be imaged. The visibility of the pattern at the other end of the fiber is then analyzed as wavelength and fringe period are varied.
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