A5051584591- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Geophysics and Sensor Technology
- Astrophysics and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
- Radio Astronomy Observations and Technology
- Seismic Waves and Analysis
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Particle physics theoretical and experimental studies
- Photonic and Optical Devices
- Radiation Detection and Scintillator Technologies
- Stellar, planetary, and galactic studies
- Black Holes and Theoretical Physics
- Tropical and Extratropical Cyclones Research
- Particle Accelerators and Free-Electron Lasers
Australian National University
2014-2024
Florida State University
2022-2024
University of Oklahoma
2023
Cooperative Institute for Mesoscale Meteorological Studies
2023
Kenyon College
2017-2022
California Institute of Technology
2017-2021
ARC Centre of Excellence for Gravitational Wave Discovery
2011-2021
University of Wisconsin–Milwaukee
2012-2016
Goddard Space Flight Center
2014
Quantum (Australia)
2014
Context. Recent spectropolarimetric observations of Herbig Ae/Be stars have yielded new arguments in favour a fossil origin for the magnetic fields intermediate mass stars.
Non-classical squeezed states of light are becoming increasingly important to a range metrology and other quantum optics applications in cryptography, computation biophysics. Applications such as improving the sensitivity advanced gravitational wave detectors development space-based networks will require robust deployable vacuum-compatible sources. To date non-linear photonics devices operated under high vacuum have been simple single pass systems, testing harmonic generation production...
The next generation of Gravity Recovery and Climate Experiment (GRACE)-like dual-satellite geodesy missions proposals will rely on inter-spacecraft laser interferometry as the primary instrument to recover signals. Laser frequency stability is one main limits this measurement important at two distinct timescales: short timescales over 10-1000 seconds measure local gravity below satellites, month year timescales, where subsequent measurements are compared indicate loss or gain mass (or water...
Low power optical phase tracking is an enabling capability for intersatellite laser interferometry, as minimum trackable places significant constraints on mission design. Through the combination of stabilization and control-loop parameter optimization, we have demonstrated continuous a subfemtowatt field with mean time between slips more than 1000 s. Comparison analytical models numerical simulations verified that observed experimental performance was limited by photon shot noise...
This paper describes, to our knowledge, the first demonstration of high performance tilt locking, a method stabilizing laser frequency an optical reference cavity using spatial-mode readout technique. The experiment utilized traveling wave with finesse approximately 10,000, housed in thermally controlled vacuum chamber. locking double pass configuration has promising 100 µHz–1 Hz band, including surpassing Gravity Recovery and Climate Experiment (GRACE) Follow-On ranging interferometer...
Abstract N -on- p silicon sensors will be utilized in the Compact Muon Solenoid (CMS) detector's tracker and High Granularity Calorimeter (HGCAL) Luminosity upgrade of Large Hadron Collider (HL-LHC). Among their several advantages terms radiation hardness over traditional n extreme environment HL-LHC are electron collection instead holes overlapping maxima weighting electric fields at charge-collecting electrodes. The disadvantage multi-channel SiO 2 -passivated is generation an inversion...
We propose a modified configuration of an advanced gravitational-wave detector that is speed-meter-type interferometer with improved sensitivity respect to quantum noise. With the addition polarization-controlling components output arm cavity Michelson interferometer, orthogonal polarization state can be used store signal, returning it later opposite phase cancel position information below storage bandwidth mode. This modification provides alternative external kilometer-scale Fabry-P\'erot...
Abstract The development and intensification of low-level mesocyclones in supercell thunderstorms have often been attributed, at least part, to augmented streamwise vorticity generated baroclinically the forward flank supercells. However, ambient environment (often quantified via storm-relative helicity), especially near ground, is particularly skillful discriminating between nontornadic tornadic This study investigates whether origins inflow air into mesocyclones, both horizontally...
The sensitivity of future gravitational wave interferometers is expected to be limited through-out the detection band by quantum vacuum fluctuations, which can reduced non-demolition methods such as squeezed injection. However, optical losses in readout chainseverely limit effectiveness schemes. We propose an optomechanical device installedat output detector that mitigates effect loss, thus allowing tobetter exploit noise evasion
Future space-based geodesy missions such as the Mass Change Mission and Next Generation Gravity are expected to rely on laser ranging their primary instrument. Short-term frequency stability has previously been achieved GRACE Follow On mission by stabilizing lasers an optical cavity. The development of a technique provide long-term is be required. We have demonstrated track changes using measurements cavity’s free spectral range. In this paper, we calibrate absolute atomic reference. also...
We present a technique for frequency shifting scattering induced noise on squeezed light beams, providing immunity from scattered while preserving the states. Using 500 Hz pre and postsqueezing apparatus path length modulation, we show up to 20 dB reduction in recovering squeezing measurement below shot level. Such offers spurious sources without need optically lossy isolation optics.
With the recent detection of gravitational waves, non-classical light sources are likely to become an essential element future detectors engaged in wave astronomy and cosmology. Operating a squeezed source under high vacuum has advantages reducing optical losses phase noise compared techniques where is introduced from outside vacuum. This will ultimately provide enhanced sensitivity for modern interferometric that soon limited by quantum across much bandwidth. Here we describe optomechanical...
$N$-on-$p$ silicon sensors will be utilized in the Compact Muon Solenoid (CMS) detector's tracker and High Granularity Calorimeter (HGCAL) Luminosity upgrade of Large Hadron Collider (HL-LHC). Among their several advantages terms radiation hardness over traditional $p$-on-$n$ extreme environment HL-LHC are electron collection instead holes overlapping maxima weighting electric fields at charge-collecting electrodes. The disadvantage multi-channel SiO$_2$-passivated $n$-on-$p$ is generation...
Laser frequency noise suppression is a critical requirement for the Interferometer Space Antenna (LISA) mission to detect gravitational waves. The baseline laser stabilization achieved using cavity pre-stabilization and post-processing technique called Time-Delay-Interferometry (TDI). To enhance margins TDI, alternate locking schemes should be investigated. A novel stabilisation blending excellent stability of arm with existing reference has been shown theoretically meet first-generation TDI...
<p>In this presentation, we will recap the historical use of storm-relative helicity in supercell environments, share updated climatioglical distributions from both United States and Europe, simulations supercells (described below) to explain why near-ground streamwise horizontal vorticity within environment is such a powerful tool for forecasting tornadogenesis across multiple continents.</p> <p>Low-level mesocyclones thunderstorms has historically...
We present an approach to mitigating coating thermal noise in optical cavities by using multiple transverse electromagnetic (TEM) spatial modes read out and stabilize laser frequency. With optimal weightings we synthesize a wider sampling of mirror surfaces, improving the averaging Brownian fluctuations. show improvement factor 1.57, comparable mesa beam nominal 12 m prototype cavity, 1.61 over ${\text{TEM}}_{00}$ three 0.1 cavity for practical laboratory experiment, equivalent cooling...
The development of low-level mesocyclones in supercell thunderstorms has often been explained via the storm-generated streamwise vorticity along a baroclinic gradient forward flank supercells. However, ambient environment (often quantified storm-relative helicity), especially near ground, is particularly skillful at discriminating between nontornadic and tornadic This study investigates whether origins inflow air into mesocyclones, both horizontally vertically, can help explain dynamical...
A UK consortium will equip Bangor University’s Prince Madog research vessel with a hydrogen-electric hybrid propulsion system.
Coventry is leading the charge on a new type of lightweight rail system that could shake up public transport in UK and beyond.