A5065352291- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Laser Material Processing Techniques
- Laser Design and Applications
- Optical Network Technologies
- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Spectroscopy and Laser Applications
- Nonlinear Dynamics and Pattern Formation
- Silk-based biomaterials and applications
- Surface Roughness and Optical Measurements
- Ocular and Laser Science Research
- Laser-induced spectroscopy and plasma
- Chaos control and synchronization
- Semiconductor Quantum Structures and Devices
- Silkworms and Sericulture Research
- Neural Networks and Reservoir Computing
- Neurobiology and Insect Physiology Research
- Solid State Laser Technologies
- Near-Field Optical Microscopy
- Laser-Ablation Synthesis of Nanoparticles
- Insect and Arachnid Ecology and Behavior
- Ion-surface interactions and analysis
- Laser-Matter Interactions and Applications
Australian National University
2023-2024
Macquarie University
2013-2022
Australian Institute of Physics
2020
European X-Ray Free-Electron Laser
2016-2018
Washington University in St. Louis
2017
Dynamic Systems (United States)
2016
Kansas State University
2015
Campbell Soup (United States)
2015
Queen's University
2014
University of Windsor
2000-2013
Background and Purpose. Men are underrepresented in nursing, accounting for less than 6% of Canadian nurses. This research explores issues surrounding recruitment, retention, work life satisfaction men who nurses working acute care settings Method Findings. Purposive snowball sampling was used this descriptive, qualitative study. Sixteen participated four focus groups conducted three communities southwestern Ontario. The participants revealed that stress, lack full-time opportunities,...
A semiconductor laser with delayed optical feedback is an experimental implementation of a nominally infinite dimensional dynamical system. As such, time series analysis the output power from this system excellent test complexity tools, as applied to data. Additionally, systematic characterization range and variation in that can be obtained system, which available used applications like secure communication, interest. Output function level injection current, have been analyzed for using...
We present the main features of final prototype a pulsed optical laser, developed for pump-probe and other experiments in conjunction with femtosecond x-ray beams at European X-ray free-electron laser facility. Adapted to temporal emission pattern facility, provides 10 Hz bursts up 600 µs duration intra-burst pulse frequencies as high 4.5 MHz. In this mode, we have generated pulses short 12 fs 350 W average power during burst beam qualities close diffraction limit. This is, best our...
We have investigated the scaling of peak vacuum ultraviolet output power from homogeneous Xe dielectric barrier discharges excited by short voltage pulses. Increasing fill pressure above 1 bar provides an increased pulse energy, a shortened duration and increases in two to three orders magnitude. High pulses up 6 W cm−2 are generated with high efficiency for rates 50 kHz. show that temporal characteristics good agreement results detailed computer modelling discharge kinetics.
The nonlinear dynamics of two semiconductor laser systems: (i) with optical feedback, and (ii) feedback direct current modulation are evaluated from multi-GHz-bandwidth output power time-series. Animations compilations the RF spectrum (from FFT time-series) as a function level, injection signal strength is demonstrated new tool to give insight into dynamics. results contrasted prior art observations include fine structure in at low levels non-stationary switching between periodic chaotic for...
A stable nonlinear wave packet, self-localized in all three dimensions, is an intriguing and much sought after object science general photonics particular. We report on the experimental observation of mode-locked spatial laser solitons a vertical-cavity surface-emitting with frequency-selective feedback from external cavity. These spontaneously emerging long-term spatiotemporal structures have pulse length shorter than cavity round-trip time may pave way to completely independent light...
We highlight the significant progress in developing DNA vaccines during SARS-CoV-2 pandemic. Specifically, we provide a comprehensive review of that have progressed to Phase 2 testing or beyond, including those received authorization for use. advantages with regard rapidity production, thermostability, safety profile, and cellular immune responses. Based on user needs cost, compare three devices used clinical trials. Of devices, GeneDerm suction device offers numerous benefits, particularly...
A 4-section semiconductor laser with integrated optical feedback has been shown experimentally to be capable of operating in either the short- or long-cavity regime, by controlling device relaxation oscillation frequency relative external cavity frequency. Systematic increase injection current, and resulting frequency, allowed transition between two regimes operation observed. The system displayed a gradual from dynamic dominated regular pulse packages short-cavity regime one broadband...
Particles as small 0.3 μm in diameter have been successfully removed from a glass surface using single ultraviolet pulse frequency doubled copper vapor laser (255.3 nm). Quantitative analysis of the particle density before and after irradiation shows that cleaning occurs fluence threshold is reached. The efficiency follows nonlinear trend with respect to fluence. A model presented which reveals function irradiance distribution beam used. Results modeling thermal expansion substrate...
A technique for measuring the refractive index of micron sized fibers using a series immersion matching oils, and image contrast measurements is proposed demonstrated. It has been applied to radial silks orb web weaving spider Plebs eburnus. These have widths ~1-2 microns. Values about 1.5500 are obtained, with birefringence values between 0.0000 0.0133 individual silks. An uncertainty in range ± 5 × 10(-4) 2 10(-3) achieved these challenging samples. This accuracy twenty times improvement...
Permutation entropy (PE) is commonly used to discriminate complex structure from white noise in a time series. While the PE of well understood long time-series limit, analysis general case currently lacking. Here expectation value and variance white-noise are derived as functions number ordinal pattern trials, $N$, embedding dimension, $D$. It demonstrated that probability distribution converges ${\ensuremath{\chi}}^{2}$ with $D!\ensuremath{-}1$ degrees freedom $N$ becomes large. further for...
Chaos data analysis has been performed on the chaotic output power time series from a synchronized transmitter-receiver pair of semiconductor lasers. The system uses an asymmetric, bidirectional coupling configuration between master (transmitter), which is laser diode with optical feedback, and stand-alone slave laser. correlation dimension minimum value 4, was obtained high-bandwidth measurements. dimensions for both are identical when cross-correlation coefficient chaos above 0.9. These...
Nonlinear lasers are excellent systems from which to obtain high signal-to-noise experimental data of nonlinear dynamical variables be used develop and demonstrate robust dynamics analysis techniques. Here we investigate the complexity such a system: an optically injected Nd:YVO(4) solid state laser. We show that map correlation dimension as function injection strength frequency detuning, extracted laser output power time-series data, is mirror generated theoretical model system. An...
The CoV2-001 phase I randomized trial evaluated the safety and immunogenicity of GLS-5310 bi-cistronic DNA vaccine through 48 weeks follow-up.A total 45 vaccine-naïve participants were recruited between December 31, 2020, March 30, 2021. GLS-5310, encoding for SARS-CoV-2 spike open reading frame 3a (ORF3a) proteins, was administered intradermally at 0.6 mg or 1.2 per dose, followed by application GeneDerm suction device as part a two-dose regimen spaced either 8 12 vaccinations.GLS-5310 well...
An experimental comparison of phase conjugate feedback to conventional optical in a semiconductor laser is presented, which contrasts the frequency spectra and power noise with varying levels feedback. These are correlated single regimes III V chaotically unstable regime IV. Conventional derived from mirror variable neutral density filter, self-pumped rhodium doped barium titanate photorefractive crystal. Both systems show two stable, operation regions analogous separated by region It found...
Automated protocols have been developed to characterize time series data in terms of stability. These techniques are applied the output power an optically injected vertical cavity surface emitting laser (VCSEL) subject varying injection strength and optical frequency detuning between master slave lasers. Dynamic maps, generated from high resolution, computer controlled experiments, identify regions dynamic instability parameter space.
Permutation entropy (PE) has a growing significance as relative measure of complexity in nonlinear systems.It been applied successfully to measuring laser systems.Here, PE and weighted permutation (WPE) are discovered show an unexpected inversion higher values, when characterizing the at characteristic frequencies drivers systems, for output power sequences which pulsed.The cause this is explained its presence can be used identify irregular dynamics transform into fairly regular pulsed...
Quantum cascade laser based breath sensor platform for medical applications employing a quartz-enhanced photoacoustic spectroscopy technique is reported. The detection sensitivity exhaled ammonia at <10 ppbv level with 1 s time resolution.
The electrical and optical characteristics of a dielectric barrier discharge (DBD) based neon excimer lamp generating output in the extreme ultraviolet (EUV) spectral range (λ = 84 nm) have been investigated experimentally. We report detailed comparison performance for both pulsed sinusoidal voltage excitation waveforms, using otherwise identical operating conditions. results show that yields ∼50% increase overall to EUV conversion efficiency compared with when pressure 500–900 mbar. Pulsed...
Atomic force microscopy (AFM) study is used to measure the surface topology and roughness of radial capture spider silks on micro- nanoscale. This done for orb weaver Argiope keyserlingi. Capture silk has a that five times less than silk. The an equivalent flatness λ/100 (5–6 nm deep features) as optical surface. very highly polished AFM does show number fibers make up thread but geometric distortion occurs during sample preparation. prevented from accurately measuring microscale in this study.