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A ro-vibrational Raman comb spanning 280 to 1000 nm is generated in a H2/D2-filled anti-resonant-guiding kagomé hollow-core PCF pumped at 532 nm. Addition of xenon produces a dense cluster of >150 side-bands in the visible.
Emission of narrowband pulses down to the VUV (184 nm) is demonstrated in a hydrogen-filled kagomé-PCF pumped at 266 nm. Intermodal Raman scattering facilitates the parametric excitation of short wavelengths in the all-normal dispersion regime.
It is demonstrated that thin platinum films may be deposited onto smooth glass substrates using a materials printer and a propriety organometallic ink. Under optimised printing and subsequent thermal curing conditions, excellent film adhesion to the substrates was achieved for thicknesses of about 15 nm. The resistivity of the optimised films is observed to be a factor of less than 3 higher than pure...
A supercontinuum extending from 125nm to 1200nm is generated in hydrogen-filled kagomé-PCF by means of impulsive Raman self-scattering of few-μJ ultrashort pulses at 805nm. The source shows no optical damage and is stable over time.
A noise-seeded transient Raman frequency comb spanning three octaves from 180 to 2400 nm is generated by pumping a hydrogen-filled hollow-core photonic crystal with 300 fs pulses of energy 26 µJ and wavelength 800 nm.
Side-coupling enables the selective excitation of individual higher order modes in hollow-core PCF, permitting the complex near-field modal patterns to be cleanly observed at any wavelength. Modal phase indices and losses can be accurately measured.
Making silver ion-doped glass by field-assisted ion exchange had so far two major applications: the production of optical waveguides, which utilises the change of refractive index [1], and the generation of silver nanoparticles due to annealing at higher temperatures [2]. Some groups replaced the annealing step by laser irradiation [3, 4], which resulted in low concentration of silver nanoparticles...
Modification of silver nanoparticles embedded in a glass substrate with femtosecond pulsed laser sources has recently been of great interest. These studies were fuelled by the observation of unique optical properties in terms of femtosecond pulsed laser-induced optical dichroism in these materials, leading to modification of the surface plasmon resonance (SPR) band of the embedded nanoparticles [1,...
Hollow-core photonic crystal fibre (HC-PCF) is unique host for gas-based nonlinear optical experiments. This is because it offers low-loss single-mode guidance in a micron-sized hollow core along with pressure-tunable dispersion and nonlinearity. In previous work, noble gases have been used as Raman-free nonlinear media, permitting efficient soliton-based pulse compression where the interplay between...
A beam of light propagating along the optic axis of a biaxial crystal will be transformed to a cone of light and emerge from the crystal as a hollow cylinder as predicted by W. R. Hamilton in 1832 [1] and experimentally observed shortly thereafter by H. Lloyd [2]. Cascade Conical Diffraction refers to a conical diffraction system consisting of two or more conical diffraction crystals (CDCs) in series.
Embedded silver nanoparticles in glasses have raised a wide interest recently. One fabrication technique for these, which is used in this combination only in recent years, is by using field-assisted ion exchange from a metallic silver film, followed by annealing in air atmosphere. The first step results in a layer in the glass containing silver ions, while the annealing step leads to the reduction...
Glasses containing metallic nanoparticles are of particular interest in the field of optoelectronics due to their robust nature and the unique linear and non-linear optical properties [1]. These properties are dominated by the Surface Plasmon Resonances (SPRs) of the metal inclusions and by manipulation of the characteristics of the metal the SPRs can be designed within a wide spectral range [2].
A beam of light propagating along the optic axis of a biaxial crystal will be transformed to a cone of light and emerge from the crystal as a hollow cylinder as predicted by W. R. Hamilton in 1832 [1] and experimentally observed shortly thereafter by H. Lloyd [2]. Recent renewed interest in the phenomenon has led to the development of a more complete theory, many aspects of which have yet to be experimentally...
Forward stimulated Raman scattering is used to generate a strong anti-Stokes signal in a hydrogen-filled hollow-core photonic crystal fibre (PCF). Phase-matching is achieved using higher-order modes and is controlled with a spatial light modulator.
Starting from a microchip laser and a Stokes seed generated from noise in a hydrogen-filled hollow-core photonic crystal fiber, we generate a phase-locked, octave-spanning, purely rotational frequency comb.
Hollow-core silica-air PCF filled with gas offers many opportunities for precise studies of reconfigurable nonlinear light-gas interactions. Recent results on Raman scattering in molecular gases and efficient tunable deep-UV generation in atomic gases will be reviewed.
The development of hollow-core photonic crystal fiber (HC-PCF) has led to a number of interesting experiments in the gas-phase nonlinear optics, an example being stimulated Raman scattering (SRS) in hydrogen gas [1, 2]. Multi-octave Raman frequency comb generation has been observed in H2-filled HC-PCF using a single-line pump laser [3]. If such frequency combs could be made coherent, they would find...
Gas-filled hollow-core photonic crystal fiber provides convenient conditions for studying stimulated Raman scattering in gases [1–3]. In this kind of fiber, the transmitted mode propagates almost entirely in the gas-filled core. High light intensities are maintained along the fiber, leading to a much longer effective interaction lengths compared to free space systems. As a result, strong nonlinear...
Soft glasses such as oxides, fluorides and chalcogenides offer higher nonlinearity, larger refractive indices, and extended transmission windows compared to silica [1]. Combined with the unique ability of solid-core photonic crystal fibre (PCF) to control dispersion, soft glasses have enabled low power supercontinuum (SC) generation in tellurite- [2] and lead-silicate glass PCFs [3–4].
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