Session Overview |
NSERC CREATE Guided Light Session - Bloc 2Room: Auditorium |
Date: Thursday, June 07 |
15:30 |
Modeling of ultrafast fiber amplifiers at 2.8 µm
Main Author: Simon Duval Organization: Université Laval, Canada We present an accurate numerical model for ultrashort pulse propagation in 2.8-µm fluoride fiber amplifiers. This model agrees well with experimental results. Depending on the input signal properties, we predict the generation of a watt-level supercontinuum in the 2.5 to 4.2 µm spectral range as well as clean and isolated shifted solitons at 3.3 µm with peak power exceeding 400 kW. |
15:45 |
Embedded Nanogratings for Polarization Control in Femtosecond Laser Direct Written Waveguides
Main Author: Kim Lammers Organization: Friedrich Schiller University Jena, Germany Femtosecond laser direct writing enables the precise structuring of isotropic host materials like fused silica and quartz glasses. With this technique stable integrated optical circuits can be written. These circuits are a possible candidate for future quantum technologies. We demonstrate the feasibility of creating quantum gates by directly inscribing birefringent nanograting structures and waveguides in quartz glass. |
16:00 |
Experimental and numerical investigations of 3.5 micron gain-switched fiber lasers
Main Author: Frédéric Jobin Organization: Université Laval, Canada We investigate the generation of 3.5-micron pulses by gain-switching an erbium-doped fluorozirconate fiber laser using a dual wavelength pumping scheme. Experimentally, stable nanosecond pulses were achieved from 15 to 20 kHz, reaching a maximum peak power of 204 W. Preliminary numerical simulations have shown the high impact of excited state absorption on the performances |
16:15 |
Femtosecond-written long period gratings in fluoride fibers
Main Author: Maximilian Heck Organization: IAP FSU Jena, Germany Long period gratings induced in fluoride glass fibers using femtosecond laser pulses at 800 nm are shown. By means of tightly confined ultrashort laser pulses, smooth periodic lines of refractive index changes are induced along the fiber core. Taking advantage of heat accumulation effects in the focal volume, attenuation peaks down to -24 dB, with sharp and predictable spectral resonances, were obtained. Thermal annealing of the grating up to 250 °C yielded a significant reduction of the induced refractive index change. The gratings could find applications in various integrated mid-infrared optical devices, such as optical notch filters in fiber amplifiers. |
16:30 |
Highly nonlinear augmented-low-index guiding waveguide on polymer/silicon-on-insulator platform
Main Author: Todd Darcie Organization: Aitchison Group, ECE department, University of Toronto, Canada A silicon-organic polymer hybrid waveguide is designed based on the augmented low index guiding (ALIG) principle. The proposed geometry benefits from lower two-photon absorption than slot waveguides with the same nonlinearity, making it more suitable for high-speed optical switching and FWM at high pump powers. |
16:45 |
Plasmonic nanoparticle-functionalised microstructured optical fibres for biosensing
Main Author: Brenda Mary Doherty Organization: Leibniz Institute of Photonic Technology, Germany Detecting life-threatening diseases is an ongoing challenge in biomedicine, as it requires high-precision, non-invasive identification of pathogens on the molecular level. One detection scheme involves attaching molecular probes to nanoparticles (NPs) which possess localised surface plasmon resonances (LSPRs). This removes the need for molecular labelling whilst providing sensitivity, selectivity, and reusability. Single molecular binding events could be detected through monitoring spectral shifts of the NP LSPR, i.e., tracking a microscopic event by means of a macroscopic measureable response. Our sensing approach involves immobilising NPs within microstructured optical fibres (MOFs) enabling LSPR excitation and spectral multiplexing within one device. Fibres principally allow in-vivo application, rendering them an attractive platform for medical needs. This concept presents an easy-to-use sensing platform for rapid small-volume detection with capacity for integration into a bioanalytic, optofluidic, or microfluidic system. |
17:00 |
Femtosecond Laser Processing of Integrated Opto-Mechanical Sensing Circuits with Fiber Socket Packaging
Main Author: Gligor Djogo Organization: University of Toronto, Canada In femtosecond laser processing of glass materials, direct writing of three dimensional (3D) optical waveguide circuits has been paired with chemical etching to flexibly create embedded monolithic structures for opto-mechanical sensing applications. A packaged micro-opto-mechanical sensing device is presented consisting of an all-glass micro-cantilever sensor and multi-core fiber socket. The packaging of multi-core fiber to on-chip waveguides is facilitated by fiber sockets that auto-align the fiber position, thus achieving low loss fiber-to-waveguide coupling. |
17:15 |
Photonic potential for TM waves
Main Author: Alessandro Alberucci Organization: Friedrich-Schiller-Universität Jena, Germany An effective photonic potential for TM waves propagating in inhomogeneous isotropic media is introduced. The model provides a new simpler way to describe light confinement in sub-wavelength structures, a regime where the vectorial character of the electromagnetic field cannot be neglected. |
17:30 |
Inhibition or enhancement of femtosecond laser nonlinear interactions for extending filament tracks, improving waveguide loss, speeding etching rate in bulk fused silica
Main Author: Ehsan Alimohammadian Organization: University of Toronto, Canada Laser beam shaping with a phase-only spatial light modulator (SLM) can favorably manipulate the nonlinear beam propagation and interaction of ultrashort pulsed light inside transparent fused silica to benefit three areas of material processing: extending filament tracks, writing low loss deep waveguides, and enhancing femtosecond laser irradiation followed by chemical etching (FLICE). |
17:45 |
Spin-Dependent Asymmetries in the Photoelectron Momentum Distributions in Single-Photon Double Ionization
Main Author: Friedrich Georg Fröbel Organization: Friedrich Schiller University, Germany We numerically investigate the spin-dependence of single-photon double ionization in a charge-transfer model system enabling coupled nuclear and electronic dynamics. We show that an asymmetry in the time-resolved photoelectron momentum distribution maps the intrinsic electron dynamics. In a next step, we investigate if the total spin of the system, i.e., whether the system is in the singlet or triplet state, modifies the photoelectron momentum distributions. For this, we plot the momentum-resolved asymmetry for photoelectrons going into the same direction. |
18:00 |
On-chip generation and coherent control of entangled d-level biphoton states
Main Author: Stefania Sciara Organization: INRS, Canada We demonstrate the on-chip generation and coherent control of entangled qudit states, where photons are created in a superposition of high-purity frequency modes. |
18:15 |
Gouy phase shift measurement using Interferometric Second Harmonic Generation
Main Author: Maxime Pinsard Organization: INRS-EMT, Canada A direct way to measure the Gouy phase shift of a strongly focused laser beam using interferometry is reported. This is of interest for a wide range of fields, including waveguides. |