D. A. Shaddock
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View article: Experimental demonstration of the combined arm- and cavity-locking system for LISA
Experimental demonstration of the combined arm- and cavity-locking system for LISA Open
Laser frequency noise suppression is a critical requirement for the Laser Interferometer Space Antenna (LISA) mission to detect gravitational waves. The baseline laser stabilization is achieved using cavity pre-stabilization and a post-pro…
View article: Subfemtowatt Laser Phase Tracking
Subfemtowatt Laser Phase Tracking Open
Low power optical phase tracking is an enabling capability for intersatellite laser interferometry, as minimum trackable power places significant constraints on mission design. Through the combination of laser stabilization and control-loo…
View article: The torsion pendulum dual oscillator for low-frequency Newtonian noise detection
The torsion pendulum dual oscillator for low-frequency Newtonian noise detection Open
We present a torsion pendulum dual oscillator sensor designed toward the direct detection of Newtonian noise. We discuss the sensitivity limitations of the system, experimental performance characterization results, and prospectives to impr…
View article: Absolute frequency readout derived from ULE cavity for next generation geodesy missions: erratum
Absolute frequency readout derived from ULE cavity for next generation geodesy missions: erratum Open
We found a calculation error affecting the scaling of results presented in Figure 7 of our article "Absolute frequency readout derived from ULE cavity for next generation geodesy missions" [ Opt. Express 29 26014 ( 2021 ) 10.1364/OE.434483…
View article: Enhanced frequency noise suppression for LISA by combining cavity and arm locking control systems
Enhanced frequency noise suppression for LISA by combining cavity and arm locking control systems Open
This paper presents a novel method for laser frequency stabilisation in the\nLaser Interferometer Space Antenna (LISA) mission by locking a laser to two\nstable length references - the arms of the interferometer and an on-board\noptical ca…
View article: Absolute frequency readout derived from ULE cavity for next generation geodesy missions
Absolute frequency readout derived from ULE cavity for next generation geodesy missions Open
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 geodesy signals. Laser frequency …
View article: High stability laser locking to an optical cavity using tilt locking
High stability laser locking to an optical cavity using tilt locking Open
This paper describes, to our knowledge, the first demonstration of high performance tilt locking, a method of stabilizing laser frequency to an optical reference cavity using a spatial-mode readout technique. The experiment utilized a trav…
View article: Mitigation of phase noise and Doppler-induced frequency offsets in coherent random amplitude modulated continuous-wave LiDAR
Mitigation of phase noise and Doppler-induced frequency offsets in coherent random amplitude modulated continuous-wave LiDAR Open
We present a detailed analysis of techniques to mitigate the effects of phase noise and Doppler-induced frequency offsets in coherent random amplitude modulated continuous-wave (RAMCW) LiDAR. The analysis focuses specifically on a techniqu…
View article: Coherent Beam Combining Using an Internally Sensed Optical Phased Array of Frequency-Offset Phase Locked Lasers
Coherent Beam Combining Using an Internally Sensed Optical Phased Array of Frequency-Offset Phase Locked Lasers Open
Coherent beam combining can be used to scale optical power and enable mechanism-free beam steering using an optical phased array. Coherently combining multiple free-running lasers in a leader-follower laser configuration is challenging due…
View article: Optical vortex beams with controllable orbital angular momentum using an optical phased array
Optical vortex beams with controllable orbital angular momentum using an optical phased array Open
Laser beams with orbital angular momentum (OAM) have applications ranging from optical communications to quantum optics. However, the generation of OAM beams, particularly with variable OAM order, remains a challenge. We demonstrate, for t…
View article: Crosstalk reduction for multi-channel optical phase metrology
Crosstalk reduction for multi-channel optical phase metrology Open
Digitally enhanced heterodyne interferometry (DEHI) combines the sub-wavelength displacement measurements of conventional laser interferometry with the multiplexing capabilities of spread-spectrum modulation techniques to discriminate betw…
View article: Continuous-wave light detection and ranging (LiDAR) using image-reject homodyne detection and PRBS modulation
Continuous-wave light detection and ranging (LiDAR) using image-reject homodyne detection and PRBS modulation Open
We present a continuous wave Light Detection And Ranging (LiDAR) sensor that instantaneously measures distance and radial velocity with strong immunity to interference (e.g., other LiDAR sensors, glare). By au-tomatically prioritising meas…
View article: Fast beam steering and agile wavefront control with an optical phased array
Fast beam steering and agile wavefront control with an optical phased array Open
Optical phased arrays (OPAs) are a solid-state device able to manipulate the distribution of optical power without the use of mechanical beam steering systems and have potential applications in free-space laser communications, target acqui…
View article: In-Orbit Performance of the GRACE Follow-on Laser Ranging Interferometer
In-Orbit Performance of the GRACE Follow-on Laser Ranging Interferometer Open
The Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate Experiment (GRACE) Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximatel…
View article: Early Earthquake Detection with a Dual Torsion-Beam Gravimeter
Early Earthquake Detection with a Dual Torsion-Beam Gravimeter Open
Ground mass is redistributed during an earthquake causing the local gravitational potential to change. These gravitational fluctuations travel at the speed of light meaning they will arrive at a remote location significantly earlier than t…
View article: Laser ranging interferometer for GRACE follow-on
Laser ranging interferometer for GRACE follow-on Open
The Gravity Recovery and Climate Experiment (GRACE) has produced a wealth of data on Earth gravity, hydrology, glaciology and climate research. To continue that data after the imminent end of the GRACE mission, a follow-on mission is plann…
View article: High power compatible internally sensed optical phased array
High power compatible internally sensed optical phased array Open
The technical embodiment of the Huygens-Fresnel principle, an optical phased array (OPA) is an arrangement of optical emitters with relative phases controlled to create a desired beam profile after propagation. One important application of…
View article: Optomechanical design and construction of a vacuum-compatible optical parametric oscillator for generation of squeezed light
Optomechanical design and construction of a vacuum-compatible optical parametric oscillator for generation of squeezed light Open
With the recent detection of gravitational waves, non-classical light sources are likely to become an essential element of future detectors engaged in gravitational wave astronomy and cosmology. Operating a squeezed light source under high…
View article: Algebraic cancellation of polarisation noise in fibre interferometers
Algebraic cancellation of polarisation noise in fibre interferometers Open
This experiment uses digital interferometry to reduce polarisation noise from a fiber interferometer to the level of double Rayleigh backscatter making precision fiber metrology systems robust for remote field applications. This is achieve…
View article: TorPeDO: A Low Frequency Gravitational Force Sensor
TorPeDO: A Low Frequency Gravitational Force Sensor Open
Second generation gravitational wave detectors are likely to be limited by Newtonian Noise at low frequencies. A dual torsion pendulum sensor aimed at exploring low-frequency gravitational-force noise is being studied at the ANU. This sens…
View article: A squeezed light source operated under high vacuum
A squeezed light source operated under high vacuum Open
Non-classical squeezed states of light are becoming increasingly important to a range of metrology and other quantum optics applications in cryptography, quantum computation and biophysics. Applications such as improving the sensitivity of…
View article: Frequency dependence of thermal noise in gram-scale cantilever flexures
Frequency dependence of thermal noise in gram-scale cantilever flexures Open
We present measurements of the frequency dependence of thermal noise in aluminum and niobium flexures. Our measurements cover the audio-frequency band from 10 Hz to 10 kHz, which is of particular relevance to ground-based interferometric g…
View article: Thermal noise of gram-scale cantilever flexures
Thermal noise of gram-scale cantilever flexures Open
We present measurements of thermal noise in niobium and aluminium flexures. Our measurements cover the audio frequency band from 10Hz to 10kHz, which is of particular relevance to ground-based interferometric gravitational wave detectors, …