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We present a class of fibers that exploit light propagation in higher-order modes, and hence decouple the dispersion-versus-mode-area trade-off encountered in conventional fibers. This enables exploiting the multitude of nonlinear optical effects afforded by fibers, at energy levels potentially approaching those of tunable solid-state lasers.
We demonstrate an extended depth of focus (DOF) for optical coherence tomography (OCT) using a Bessel-like higher order fiber mode. The DOF is enhanced by 7× and the lateral resolution is about 10 μm.
We generate over two octaves of light in Bessel-beam-like fiber modes by pumping in the LP06 mode of a custom fiber. Distinct lines are generated in the visible in mode orders that increase monotonically from LP07 at 678 nm to LP016 at 453 nm.
We demonstrate modally pure propagation over a record number (12) of modes in an optical fiber. An air-core fiber enables this by supporting OAM states. We achieve mode purities >10dB over 2m for all states and >20dB after 1km for a 2 state subset.
We propose exploiting intermodal four-wave mixing for energy-scalable tuneable fiber lasers, hitherto restricted to low powers, constrained by dispersion-tailoring limitations in PCFs. Conversion over an octave, at mJ-energy-levels, appears feasible.
We demonstrate electrically tunable long-period grating in fluid-filled solid-core photonic bandgap fiber (PBGF) using acoustic waves. We show that highly dispersive nature of PBGF modes results in very narrow-band rejection in spectrum.
We relate solid core photonic crystal fibres guidance properties to the scattering properties of single cylinders, beyond the sole prediction of guidance bands. We explain evolution of losses between and within bands using Fano resonances.
Solid core photonic bandgap fibers (PBGFs) incorporate a microstructure lattice of high index rods in a low index matrix surrounding a defect core formed by one or several missing rods. Liquids, which can have a wide variety of absorption, gain, nonlinear, and thermal properties, have been used as the high index medium in such fibers. The modal interaction with the liquid is thus an important consideration...
Fluid filled photonic bandgap fibers (PBGFS) incorporate materials with a large thermo-optic coefficient. the modes of these fibers also have very strong waveguide dispersion. we exploit these two properties of PBGFS to demonstrate highly tunable long period gratings.
Fluid filled photonic bandgap fibers (PBGFs) incorporate materials with a large dn/dT. The modes of these fibers are also strongly dispersive. We exploit these properties of PBGFs to demonstrate highly tunable long period gratings
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