ORCID Profile
0000-0002-8662-0467
Current Organisations
Durham University
,
University of Western Australia
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Communications Technologies | Optical And Photonic Systems | Microwave and Millimetrewave Theory and Technology | Instruments And Techniques | Quantum Optics And Lasers | Atomic and Molecular Physics | Satellite Communications
ANZSRC Socio-Economic Objective (SEO)
Telecommunications | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Physical sciences | Scientific instrumentation | Expanding Knowledge in Technology |
Related Links
Publications
Ultraviolet laser spectroscopy of neutral mercury in a one-dimensional optical lattice
Publisher: American Physical Society (APS)
Date: 14-09-2011
Considerations on the measurement of the stability of oscillators with frequency counters
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2007
Abstract: The most common time-domain measure frequency stability, the Allan variance, is typically estimated using a frequency counter. Close examination the operation of modern high-resolution frequency counters shows that they do not make measurements in the commonly assumed. The consequence is that the results typically reported by many laboratories using these counters are not, in fact, the Allan variance, but a distorted representation. We elucidate the action of these counters by consideration of their operation in the Fourier domain, and demonstrate that the difference between the actual Allan variance and that delivered by these counters can very significant for some types of oscillators. We also discuss ways to avoid, or account for, a distorted estimation of Allan variance.
Ground-state atomic polarization relaxation-time measurement of Rb filled hypocycloidal core-shaped Kagome HC-PCF
Publisher: IOP Publishing
Date: 07-09-2016
Elimination of pump-induced frequency jitter on fiber-laser frequency combs
Publisher: Optica Publishing Group
Date: 07-2006
DOI: 10.1364/OL.31.001997
Abstract: Optical frequency combs generated by femtosecond fiber lasers typically exhibit significant frequency noise that causes broad optical linewidths, particularly in the comb wings and in the carrier-envelope offset frequency (f(ceo)) signal. We show these broad linewidths are mainly a result of white litude noise on the pump diode laser that leads to a breathing-like motion of the comb about a central fixed frequency. By a combination of passive noise reduction and active feedback using phase-lead compensation, this noise source is eliminated, thereby reducing the f(ceo) linewidth from 250 kHz to <1 Hz. The in-loop carrier-envelope offset phase jitter, integrated to 100 kHz, is 1.3 rad.
Testing periodic local position invariance using long-term comparison of the SYRTE atomic fountains and H-masers
Publisher: WORLD SCIENTIFIC
Date: 26-01-2014
Progress towards atomic vapor photonic microcells: Coherence and polarization relaxation measurements in coated and uncoated HC-PCF
Publisher: SPIE
Date: 06-03-2013
DOI: 10.1117/12.2013177
Coherent bisection of 141 THz using sum frequency generation of 1064 and 709 nm radiation
Publisher: Springer Science and Business Media LLC
Date: 2002
New frequency ratios with a PHz-scale atomic clock
Publisher: IOP Publishing
Date: 16-11-2016
Hyperfine constants and line separations for the 1S0−3P1 intercombination line in neutral ytterbium with sub-Doppler resolution
Publisher: American Physical Society (APS)
Date: 14-10-2019
Spectroscopy and laser cooling on the $${}^{1}S_{0}$$ 1 S 0 – $$\,^{3}P_{1}$$ 3 P 1 line in Yb via an injection-locked diode laser at 1,111.6 nm
Publisher: Springer Science and Business Media LLC
Date: 10-02-2015
Sub-Doppler cooling of ytterbium with the ^1S_0–^1P_1 transition including ^171Yb (I=1/2)
Publisher: The Optical Society
Date: 23-06-2014
Efficient detection and control of the carrier-envelope offset frequency in a self-referencing optical frequency synthesizer
Publisher: Springer Science and Business Media LLC
Date: 07-2004
Low-noise synthesis of microwave signals from an optical source
Publisher: Institution of Engineering and Technology (IET)
Date: 2005
DOI: 10.1049/EL:20050505
Toward a mercury optical lattice clock
Publisher: IEEE
Date: 06-2010
Optical frequency stabilization with a synchronous frequency-to-voltage converter
Publisher: The Optical Society
Date: 15-04-2019
DOI: 10.1364/AO.58.003128
Noise properties of microwave signals synthesized with femtosecond lasers
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2007
Abstract: We discuss various aspects of high resolution measurements of phase fluctuations at microwave frequencies. This includes methods to achieve thermal noise limited sensitivity, along with the improved immunity to oscillator litude noise. A few prototype measurement systems were developed to measure phase fluctuations of microwave signals extracted from the optical pulse trains generated by femtosecond lasers. This enabled first reliable measurements of the excess phase noise associated with optical-to-microwave frequency ision. The spectral density of the excess phase noise was found to be -140 dBc/Hz at 100 Hz offset from the 10 GHz carrier which was almost 40 dB better than that of a high quality microwave synthesizer.
Resonant interferometric autocorrelator for estimation of laser pulse duration
Publisher: AIP Publishing
Date: 20-12-2005
DOI: 10.1063/1.1834699
Abstract: We present a simple design for a Mach–Zehnder interferometric autocorrelator that is aimed at real-time laser pulse diagnostics. The device is based around a symmetric and balanced mechanical oscillator that confers a simple and compact design, while still allowing the measurement of a broad range of pulse durations with high speed and high resolution. The device requires a very low drive level and possesses a very weak mechanical coupling to the environment. The apparatus provides two outputs: one output is proportional to the instantaneous velocity of the interferometer arms, which can be integrated to determine the arm position. This gives the means to calibrate the arm position accurately and thereby account for any nonuniformity of the motion. The second output, from a two-photon photodetector, is used to determine the pulse duration. The present device can measure pulses from the femtosecond through to the picosecond domain.
Optical and microwave frequency stability: some constraints
Publisher: IEEE
Date: 2005
Optical frequency synthesis from a cryogenic microwave sapphire oscillator
Publisher: Optica Publishing Group
Date: 2006
DOI: 10.1364/OE.14.004316
Abstract: We demonstrate an optical frequency comb with fractional frequency instability of </=2x10(-14) at measurement times near 1 s, when the 10th harmonic of the comb spacing is controlled by a liquid helium cooled microwave sapphire oscillator. The frequency instability of the comb is estimated by comparing it to a cavity-stabilized optical oscillator. The less conventional approach of synthesizing low-noise optical signals from a microwave source is relevant when a laboratory has microwave sources with frequency stability superior to their optical counterparts. We describe the influence of high frequency environmental noise and how it impacts the phase-stabilized frequency comb performance at integration times less than 1 s.
Fiber-laser frequency comb: An explanation for the offset frequency linewidth
Publisher: IEEE
Date: 2006
Simulation of optical lattice trap loading from a cold atomic ensemble
Publisher: Optica Publishing Group
Date: 02-12-2020
DOI: 10.1364/JOSAB.408521
Abstract: We model the efficiency of loading atoms of various species into a one-dimensional optical lattice from a cold ensemble, taking into account the initial cloud temperature and size, the lattice laser properties affecting the trapping potential, and the atomic parameters. Stochastic s ling and dynamical evolution are used to simulate the transfer, leading to estimates of transfer efficiency for varying trap depth and profile. Tracing the motion of the atoms also enables the evaluation of the equilibrium temperature and site occupancy in the lattice. The simulation compares favorably against a number of experimental results and is used to compute an optimum lattice-waist-to-cloud-radius ratio for a given optical power.
Laser locking to the ^199Hg ^1S_0 − ^3P_0 clock transition with 54 × 10^−15/✓τ fractional frequency instability
Publisher: The Optical Society
Date: 16-08-2012
DOI: 10.1364/OL.37.003477
Extended Duration of Rubidium Vapor in Aluminosilicate Ceramic Coated Hypocycloidal Core Kagome HC-PCF
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2014
Optical Lattice Trapping of $^199$Hg and Determination of the Magic Wavelength for the Ultraviolet $^1$S$_0↔^3$P$_0$ Clock Transition
Publisher: American Physical Society (APS)
Date: 18-02-2011
Laser stabilization with a frequency-to-voltage chip for narrow-line laser cooling
Publisher: The Optical Society
Date: 21-03-2018
DOI: 10.1364/OL.43.001475
A passively mode-locked fiber laser at 1.54 μm with a fundamental repetition frequency reaching 2 GHz
Publisher: Optica Publishing Group
Date: 2007
DOI: 10.1364/OE.15.013155
Abstract: We demonstrate a fundamentally mode-locked fiber laser with a repetition frequency in excess of 2 GHz at a central wavelength of 1.535 mum. Co-doped ytterbium-erbium fiber provides the gain medium for the laser, affording high gain per unit length, while a semiconductor saturable absorber mirror (SAM) provides the pulse shaping mechanism in a standing wave cavity. Results are shown confirming cw mode-locking for 1 GHz and 2 GHz repetition frequency systems. The response of the frequency comb output to pump power variations is shown to follow a single pole response. The timing jitter of a 540MHz repetition-rate laser has been suppressed to below 100 fs through phase-lead compensated feedback to the pump power. Alternatively, a single comb line of a 850MHz repetition-rate laser has been phase-locked to a narrow linewidth cw laser with an in-loop phase jitter of 0.06 rad(2). The laser design is compatible with low-noise oscillator applications.
Clock and inter-combination line frequency separation in 171Yb
Publisher: IOP Publishing
Date: 07-03-2016
Optical frequency synthesis with 1 Hz resolution
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-1999
DOI: 10.1109/19.769657
Sub-Doppler cooling of fermionic Hg isotopes in a magneto-optical trap
Publisher: The Optical Society
Date: 08-09-2010
DOI: 10.1364/OL.35.003078
Optical frequency measurements of6 s
Publisher: American Physical Society (APS)
Date: 08-03-2006
Multiconfiguration Dirac-Hartree-Fock calculations for Hg and Cd with estimates for unknown clock-transition frequencies
Publisher: American Physical Society (APS)
Date: 09-02-2022
Efficient continuous-wave ultraviolet generation in LiB_3O_5 and RbD_2AsO_4
Publisher: Optica Publishing Group
Date: 20-06-2000
DOI: 10.1364/AO.39.003115
Abstract: We have demonstrated two continuous-wave nonlinear processes: third-harmonic generation (THG) of 1064-nm radiation with a lithium triborate (LBO) crystal, and second-harmonic generation of 696-nm radiation in deuterated rubidium dihydrogen arsenate. With 34 mW of 1064-nm and 25 mW of 532-nm radiation incident upon the LBO crystal, as much as 60 nW of third-harmonic power has been produced. We present the characteristics that optimize the production of nonlinear power in this sum-frequency generation process. In the second experiment, 15 nW of radiation at 348 nm was produced with 9 mW of 696-nm incident radiation. Both processes will play an important role in the new generation of optical synthesis techniques.
Intercombination line frequencies in 171Yb validated with the clock transition
Publisher: Optica Publishing Group
Date: 15-05-2023
DOI: 10.1364/AO.488653
Abstract: We have carried absolute frequency measurements of the (6 s 2 ) 1 S 0 −(6 s 6 p ) 3 P 1 transition in 171 Yb (intercombination line), where the spin-1/2 isotope yields two hyperfine lines. The measurements rely on sub-Doppler spectroscopy to yield a discriminator to which a 556 nm laser is locked. The frequency reference for the optical frequency measurements is a high-quality quartz oscillator steered to the GNSS time scale that is bridged with a frequency comb. The reference is validated to ∼3×10 −12 by spectroscopy on the 1 S 0 − 3 P 0 (clock) line in laser cooled and trapped 171 Yb atoms. From the hyperfine separation between the F =1/2 and F =3/2 levels of 3 P 1 , we determine the hyperfine constant to be A ( 3 P 1 )=3957833(28)kHz.
Frequency-comb spectroscopy of theD 1
Publisher: American Physical Society (APS)
Date: 07-03-2008
Production of ultracold
Cs * Yb
Publisher:
American Physical Society (APS)
Date:
19-06-2018
Publisher: American Physical Society (APS)
Date: 19-06-2018
Isotope shifts for 1S0−3P0,1o Yb lines from multiconfiguration Dirac-Hartree-Fock calculations
Publisher: American Physical Society (APS)
Date: 10-08-2021
Testing local position and fundamental constant invariance due to periodic gravitational and boost using long-term comparison of the SYRTE atomic fountains and H-masers
Publisher: American Physical Society (APS)
Date: 05-06-2013
Reaching the 10 -15 accuracy range with a Hg optical lattice clock
Publisher: IEEE
Date: 05-2012
Progress towards atomic vapor photonic microcells: Coherence and polarization relaxation measurements in coated and uncoated HC-PCF
Publisher: No publisher found
DOI: 10.1117/12.2013177}
Femtosecond laser frequency combs: optical synthesizers for precision spectroscopy and frequency metrology
Publisher: IEEE
An inverted crossover resonance aiding laser cooling of $^171$Yb
Publisher: The Optical Society
Date: 25-05-2016
Atomic polarization relaxation time measurement of Rb filled hypocycloidal core shape Kagome HC-PCF
Publisher: OSA
Date: 2013
Uniform oscillations of supercontinua
Publisher: Springer Science and Business Media LLC
Date: 06-06-2003
Strontium and mercury optical lattice clocks at LNE-SYRTE
Publisher: IEEE
Date: 07-2012
Long rubidium vapor lifetime in aluminosilicate sol-gel coated hypocycloidal core shape kagome HC-PCF
Publisher: OSA
Date: 2013
New method to estimate the frequency stability of laser signals
Publisher: AIP Publishing
Date: 24-05-2004
DOI: 10.1063/1.1753674
Abstract: A frequent challenge in the scientific and commercial use of lasers is the need to determine the frequency stability of the output optical signal. In this article we present a new method to estimate this quantity while avoiding the complexity of the usual technique. The new technique displays the result in terms of the usual time domain measure of frequency stability: the square root Allan variance.
Fiber-laser frequency combs with subhertz relative linewidths
Publisher: Optica Publishing Group
Date: 25-09-2006
DOI: 10.1364/OL.31.003046
Abstract: We investigate the comb linewidths of self-referenced, fiber-laser-based frequency combs by measuring the heterodyne beat signal between two independent frequency combs that are phase locked to a common cw optical reference. We demonstrate that the optical comb lines can exhibit instrument-limited, subhertz relative linewidths across the comb spectra from 1200 to 1720 nm with a residual integrated optical phase jitter of approximately 1 rad in a 60 mHz to 500 kHz bandwidth. The projected relative pulse timing jitter is approximately 1 fs. This performance approaches that of Ti:sapphire frequency combs.
Considerations on the Measurement of the Stability of Oscillators with Frequency Counters
Publisher: IEEE
Date: 05-2007
Statistical uncertainty of $2.5\times10^-16$ for the $^199$Hg $^1S_0 -\,^3P_0$ clock transition against a primary frequency standard
Publisher: American Physical Society (APS)
Date: 30-04-2014
Neutral atom frequency reference in the deep ultraviolet with fractional uncertainty=5.7×10 -15
Publisher: American Physical Society (APS)
Date: 04-05-2012
Inverted crossover resonances with Δf=0 or 1 inverted crossover resonances with the intercombination line of 171Yb
Publisher: IEEE
Date: 07-2017
Fractional frequency instability in the 10^−14 range with a thermal beam optical frequency reference
Publisher: Optica Publishing Group
Date: 22-01-2010
Échelle spectrograph calibration with a frequency comb based on a harmonically mode-locked fiber laser: a proposal
Publisher: Optica Publishing Group
Date: 07-05-2009
DOI: 10.1364/AO.48.002752
Abstract: Details for constructing an astronomical frequency comb suitable as a wavelength reference for échelle spectrographs associated with optical telescopes are outlined. The source laser for the frequency comb is a harmonically mode-locked fiber laser with a central wavelength of 1.56 microm. The means of producing a repetition rate greater than 7 GHz and a peak optical power of approximately 8 kW are discussed. Conversion of the oscillator light into the visible can occur through a two-step process of (i) nonlinear conversion in periodically poled lithium niobate and (ii) spectral broadening in photonic crystal fiber. While not necessarily octave spanning in spectral range to permit the use of an f -to- 2f interferometer for offset frequency control, the frequency comb can be granted accuracy by linking the mode spacing and a comb tooth to separate frequency references. The design avoids the use of a Fabry-Perot cavity to increase the mode spacing of the frequency comb however, the level of supermode suppression and sideband asymmetry in the fiber oscillator and in the subsequent frequency conversion stages are aspects that need to be experimentally tested.
Erratum
Publisher: American Physical Society (APS)
Date: 18-11-2015
An optical beam frequency reference with 10−14 range frequency instability
Publisher: AIP Publishing
Date: 20-07-2009
DOI: 10.1063/1.3184578
Sub-Doppler cooling with the 1S0 -1P 1 line in ytterbium
Publisher: IEEE
Date: 05-2014
Inverted crossover resonance within one Zeeman manifold
Publisher: IOP Publishing
Date: 02-08-2017
Fourier transform detection of weak optical transitions in atoms undergoing cyclic routines
Publisher: AIP Publishing
Date: 04-01-2021
DOI: 10.1063/5.0034217
Abstract: We demonstrate a means of detecting weak optical transitions in cold atoms that undergo cyclic (preparation, probing, and detection) routines with improved sensitivity. The gain in sensitivity is made by probing atoms on alternate cycles of a repeated experimental sequence, leading to regular modulation of the ground state atom population when at the resonance frequency. The atomic transition is identified by conducting a fast Fourier transform via an algorithm or instrument. We find an enhancement of detection sensitivity compared to more conventional scanning methods of ∼20 for the same s ling time, and can detect contemporary clock lines with fewer than 103 atoms in a magneto-optical trap. We apply the method to the (6s2) 1S0−(6s6p) 3P0 clock transition in 171Yb and 173Yb. In addition, the ac-Stark shift of this line in 171Yb is measured to be 0.19(3) kHz W−1 m2 at 556 nm.
Suppression of pump-induced frequency noise in fiber-laser frequency combs leading to sub-radian f ceo phase excursions
Publisher: Springer Science and Business Media LLC
Date: 09-2006
Efficient Islolation of fo in an Optical Frequency Synthesizer
Publisher: IEEE
Date: 06-2004
Optical Lattice Clocks as Candidates for a Possible Redefinition of the SI Second
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2013
Towards an optical lattice clock based on mercury
Publisher: IEEE
Date: 04-2010
Reaching the 10-15 accuracy range with a Hg optical lattice clock
Publisher: IEEE
Date: 04-2012
Optical lattice clock with neutral mercury
Publisher: IEEE
Date: 08-2011
Related Organisations
Durham University
Location: United Kingdom of Great Britain and Northern Ireland
National Institute Of Standards And Technology
Location: United States of America
Related Funding Activities
Atomic Clocks For A Southern Hemisphere Based Ground Station
Start Date: 2012
End Date: 2016
Funder: Australian Research Council
View Funded ActivityLinkage - International - Grant ID: LX0665384
Start Date: 2006
End Date: 12-2007
Amount: $22,000.00
Funder: Australian Research Council
View Funded ActivityARC Future Fellowships - Grant ID: FT110100392
Start Date: 05-2012
End Date: 05-2016
Amount: $533,868.00
Funder: Australian Research Council
View Funded Activity