Malcolm B. Gray
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View article: Single code pseudo-random quadrature phase shifting homodyne interferometry
Single code pseudo-random quadrature phase shifting homodyne interferometry Open
Digitally enhanced homodyne interferometry traditionally uses two pseudo-random noise codes to form a quadrature phase shifting modulation. It enables the recovery of interference phase information alongside time-of-flight range gating, wi…
View article: Digital Interferometric Open Loop Phase Recovery in a Fiber Optic Gyroscope
Digital Interferometric Open Loop Phase Recovery in a Fiber Optic Gyroscope Open
We present the first use of a Digitally Enhanced Homodyne readout on a Sagnac interferometer, demonstrating the technique's capability as a readout method for high dynamic range, open loop interferometric fiber optic gyroscopes. We achieve…
View article: Efficient polarization independent OCT system using a single reference arm design
Efficient polarization independent OCT system using a single reference arm design Open
We present an efficient polarization-independent optical coherence tomography (PI-OCT) system that reduces signal fading due to polarization variations by over 92%. Unlike traditional PI systems that require separate reference arms for ort…
View article: Common-mode phase noise suppression with an open-loop differential phasemeter
Common-mode phase noise suppression with an open-loop differential phasemeter Open
We present direct differential phase recovery-an open-loop phasemeter topology for differential optical interferometric measurements. The technique aims to remove common mode signal dynamics prior to phase-tracking, which reduces the dynam…
View article: Polarization impedance measurement cavity enhanced laser absorption spectroscopy
Polarization impedance measurement cavity enhanced laser absorption spectroscopy Open
We present a theoretical overview and experimental demonstration of a continuous-wave, cavity-enhanced optical absorption spectrometry method to detect molecular gas. This technique utilizes the two non-degenerate polarization modes of a b…
View article: Double Rayleigh scattering in a digitally enhanced, all-fiber optical frequency reference
Double Rayleigh scattering in a digitally enhanced, all-fiber optical frequency reference Open
We demonstrate a passive, all-optical fiber frequency reference using a digitally enhanced homodyne interferometric phase readout. We model the noise contributions from fiber thermal noise and the coupling of double Rayleigh scattering in …
View article: Infrasonic performance of a passively stabilized, all-fiber, optical frequency reference
Infrasonic performance of a passively stabilized, all-fiber, optical frequency reference Open
We report the infrasonic performance of a fiber optic laser frequency reference with potential application to space-based gravitational wave detectors, such as the Laser Interferometer Space Antenna. We determine the optimum cross-over fre…
View article: Multi-target CW interferometric acoustic measurements on a single optical beam
Multi-target CW interferometric acoustic measurements on a single optical beam Open
We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferom…
View article: Multi-Target Continuous Wave Interferometric Acoustic Measurements on a Single Optical Beam
Multi-Target Continuous Wave Interferometric Acoustic Measurements on a Single Optical Beam Open
We present a free-space, continuous-wave laser interferometric system capable of multi-target dynamic phase measurement at acoustic frequencies up to a Nyquist bandwidth of 10.2 kHz. The system uses Digitally-enhanced Heterodyne Interferom…
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…