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We have compared the radiation resistance of various Er3+-doped fiber preforms manufactured with different technologies: Si and Al nanoparticles doped fibers, and standard MCVD fibers. All of them have been irradiated with a total gamma dose of 5.9 kGy and then studied using absorption and EPR spectroscopies.
We realized on-chip silica microspheres, featuring excellent thermal coupling to the silicon-wafer. These chip-based microspheres can overcome the problem of thermal bistability and are especially suitable for optomechanical studies in vacuum or at low temperature.
We experimentally demonstrate a Type I grating effect in a lanthanum-aluminum silicate fiber for the first time, to the best of our knowledge. This grating shows a temperature sensitivity ∼8.71 pm/°C, which is lower than that of FBG in standard single-mode fiber.
A differential optical profilometry technique with picometre-range sensitivity is adapted to the non invasive measurement of the roughness inside hollow glass fibres by use of immersion objectives and index-matching liquid.
We report an experimental study of Brillouin-scattering-induced transparency (BSIT) in a silica microsphere. Because of the phase-matching requirement, the non-reciprocal light storage based on the BSIT is observed in our experiment.
This tutorial reviews state-of-the-art heterogeneous 2D/3D photonic integration technologies involving various novel fabrication techniques leading to realization of chip-scale microsystems with photonic-electronic-integrated-circuits. Future prospects and challenges in computing and networking applications will also be discussed.
We experimentally demonstrate 2-D photonic crystal slab-coupled plasmonic nanocapsules for surface enhanced Raman spectroscopy (SERS). A strong Raman signal enhancement can be unambiguously detected even with a low concentration 10 nM dye molecules.
2.7-μm microjoule femtosecond pulses are generated in a metal coated hollow fiber thru four-wave-mixing parametric amplification. Numerical simulations predict generation of few-cycle optical pulses with the central wavelength extending beyond 10 μm.
We report on the generation of 34 fs and 50 μJ pulses from a high energy fiber amplifier system with nonlinear compression in an air-filled hypocycloid-core Kagome fiber. The unique properties of such fibers allow to bridge the gap between solid core fibers-based and hollow capillaries-based post-compression setups, thereby operating with pulse energies obtained with current state-of-the-art fiber...
Metal ion implantation in glass causes lots of defects in lattice during its fabricating process. We found that the femtosecond laser irradiation have a great efficiency to repair these defects with high spatial selectivity.
We report 50-milli-Hertz-linewidth optomechanical oscillation of a silica microsphere immersed in a buffer solution. Using the microsphere as a nanosensor, single 10-nm-radius silica beads and Bovine serum albumin (BSA) protein molecules were detected.
Integrated microresonators based on SiN waveguides are an attractive platform for nonlinear optics. Here we present a new photonic Damascene fabrication process that solves common problems in SiN waveguide fabrication and demonstrate frequency comb formation.
Mid-infrared Raman sources based on highly GeO2-doped silica-fibers pumped at ∼2.0 μm pulsed/cw lasers are studied. Supercontinuum generation up to 3.0 μm and cascaded Raman scattering up to 2.53 μm are achieved, respectively.
Penetration of liquids into SiO2 ridge waveguides during standard processing steps is shown to cause poor mode confinement and increased loss. Thermal annealing repeatedly restores a core with uniform index and low-loss mode confinement.
We report on enlarged hollow-core diameter inhibited coupling Kagome fibers with record loss of 100 dB/km and ppm power overlap with silica surround, suitable for high energy ultrafast laser handling.
A novel and highly sensitive liquid level sensor based on a polymer optical fiber Bragg grating (POFBG) is reported for the first time. The sensitivity of the sensor is found to be 57 pm/cm of liquid, enhanced by more than a factor of 5 when compared to an equivalent sensor based on silica fiber.
An efficient polarization beam splitter (PBS) based on a silica microcapillary is proposed and experimentally demonstrated. This PBS relies on the inherent-geometry-induced birefringence. A maximum extinction ratio of up to 25 dB is achieved.
We investigate the Kerr nonlinearity in a core-shell microspherical resonator fabricated from a silicon fiber. By exploiting the ultrafast wavelength shifting, sub-picosecond modulation is demonstrated.
We studied the carrier relaxation dynamics in graphene-on-silicon nitride waveguides. Optically generated carriers from a quasi-continuous wave pump laser show a microsecond response time while those generated from mode-locked laser pulses exhibit accelerated relaxation dynamics.
We propose a novel low threshold, CMOS-compatible laser structure with a strained germanium gain medium and a photonic crystal cavity. We demonstrate 1.70% uniaxial tensile strain through experiments and design a high quality factor (>11,000) optical cavity around the gain medium.
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