Helen Margolis
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British physicist
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Physics
Helen Margolis's Degrees
- Masters Physics University of Oxford
- Bachelors Physics University of Oxford
Why Is Helen Margolis Influential?
(Suggest an Edit or Addition)According to Wikipedia, Helen Sarah Margolis is a British physicist who is a Senior Fellow and Head of Science for Time and Frequency at the National Physical Laboratory. Her research considers the use of optical frequency metrology using femtosecond combs.
Helen Margolis's Published Works
Number of citations in a given year to any of this author's works
Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author
Published Works
- Frequency ratio of two optical clock transitions in 171Yb+ and constraints on the time variation of fundamental constants. (2014) (324)
- Geodesy and metrology with a transportable optical clock (2017) (289)
- Hertz-Level Measurement of the Optical Clock Frequency in a Single 88Sr+ Ion (2004) (271)
- Test of Special Relativity Using a Fiber Network of Optical Clocks. (2017) (145)
- Einstein Gravity Explorer–a medium-class fundamental physics mission (2009) (95)
- High-resolution microwave frequency transfer over an 86-km-long optical fiber network using a mode-locked laser. (2011) (92)
- The Oxford electron‐beam ion trap: A device for spectroscopy of highly charged ions (1994) (65)
- Absolute frequency measurement of the 674-nm 88 Sr + clock transition using a femtosecond optical frequency comb (2003) (64)
- Agreement between two 88 Sr + optical clocks to 4 parts in 10 17 (2014) (64)
- Dissemination of an optical frequency comb over fiber with 3 × 10−18 fractional accuracy (2012) (57)
- Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks (2019) (54)
- High-stability microwave frequency transfer by propagation of an optical frequency comb over 50 km of optical fiber. (2010) (53)
- High-accuracy frequency atlas of 13C2H2 in the 1.5 μm region (2005) (52)
- Trapped Ion Optical Frequency Standards (2003) (48)
- Absolute frequency measurement of the 2S1/2–2F7/2 electric octupole transition in a single ion of 171Yb+ with 10−15 fractional uncertainty (2012) (46)
- Astrodynamical Space Test of Relativity Using Optical Devices I (ASTROD I)—A class-M fundamental physics mission proposal for Cosmic Vision 2015–2025 (2008) (45)
- Measurement of the electric quadrupole moment of the 4d2D5/2 level in 88Sr+. (2004) (42)
- Absolute frequency measurement of a 1.5-microm acetylene standard by use of a combined frequency chain and femtosecond comb. (2004) (40)
- High-precision frequency measurements of the ν1 + ν3 combination band of 12C2H2 in the 1.5 μm region (2005) (39)
- Frequency metrology and clocks (2009) (39)
- Geodetic methods to determine the relativistic redshift at the level of 10$$^{-18}$$-18 in the context of international timescales: a review and practical results (2018) (37)
- Optical Clocks in Space (2006) (36)
- An optical frequency standard based on the electric octupole transition in /sup 171/Yb/sup +/ (2005) (35)
- Optical frequency standards and clocks (2010) (34)
- Frequency measurement of the S 2 1 / 2 − F 2 7 / 2 electric octupole transition in a single Y 171 b + ion (2009) (34)
- Timekeepers of the future (2014) (34)
- Subkilohertz absolute-frequency measurement of the 467-nm electric octupole transition in {sup 171}Yb{sup +} (2003) (32)
- Suppression of amplitude-to-phase noise conversion in balanced optical-microwave phase detectors. (2013) (32)
- Precision Measurement of the 1s2p P32-P13 Fine Structure Interval in Heliumlike Fluorine (1999) (32)
- Evaluating the performance of the NPL femtosecond frequency combs: agreement at the 10−21 level (2014) (32)
- Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values (2015) (32)
- Matter wave explorer of gravity (MWXG) (2009) (32)
- A pyramid MOT with integrated optical cavities as a cold atom platform for an optical lattice clock (2019) (28)
- Absolute frequency measurements of 633 nm iodine-stabilized helium–neon lasers (2003) (28)
- Studies of magnetic dipole transitions in highly charged argon and barium using an electron beam ion trap (1997) (26)
- Development and absolute frequency measurement of a pair of 778 nm two-photon rubidium standards (2005) (22)
- International timescales with optical clocks (ITOC) (2013) (20)
- Frequency comb-based time transfer over a 159 km long installed fiber network (2017) (19)
- Optical Atomic Clocks for Space (2008) (19)
- Trapped ion optical clocks (2009) (18)
- Common-path self-referencing interferometer for carrier-envelope offset frequency stabilization with enhanced noise immunity. (2010) (17)
- Laser spectroscopy of the 1s22s2p 3P2-3P1 transition in beryllium-like argon using the Oxford EBIT (1998) (17)
- Spectroscopic applications of femtosecond optical frequency combs. (2012) (17)
- A strontium optical lattice clock with 1 × 10−17 uncertainty and measurement of its absolute frequency (2020) (17)
- Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network (2022) (17)
- Guidelines for developing optical clocks with 10-18 fractional frequency uncertainty (2019) (16)
- Direct comparisons of European primary and secondary frequency standards via satellite techniques (2019) (15)
- Frequency measurement of the 2S1/2 – 2D3/2 electric quadrupole transition in a single 171Yb+ ion (2009) (15)
- Frequency comparison of ${}^{171}$Yb${}^+$ ion optical clocks at PTB and NPL via GPS PPP (2015) (15)
- Frequency Comparison of $^{171}{\text {Yb}}^+$ Ion Optical Clocks at PTB and NPL via GPS PPP (2015) (14)
- Precision frequency measurement of the 2S1/2 — 2F7/2 electric octupole transition in a single 171Yb+ ion (2008) (12)
- Measuring the stability of fundamental constants with a network of clocks (2021) (12)
- Transportable optical frequency comb based on a mode-locked fibre laser (2008) (11)
- Absolute frequency measurement of the optical clock transition in with an uncertainty of using a frequency link to international atomic time (2017) (11)
- The NPL Rydberg Constant Experiment (2007) (11)
- A design study for a super‐EBIT/EBIS without magnetic fielda) (1996) (10)
- Frequency measurement of theS21/2−F27/2electric octupole transition in a singleY171b+ion (2009) (9)
- Transportable cavity-stabilized laser system for optical carrier frequency transmission experiments. (2014) (8)
- Hydrogenic systems, frequency standards and fundamental constants (2004) (8)
- Optical Frequency Standard Based on an Electric Octupole Transition in 171Yb+ (2004) (7)
- Dissemination of an optical frequency comb over fiber with 3 × 10 −18 fractional accuracy (2012) (7)
- Laser spectroscopy using the Oxford electron beam ion trap (1996) (6)
- Determination of the number of ions in the Oxford electron beam ion trap (1995) (6)
- Laser spectroscopy of the 2s lamb shift in hydrogen-like silicon using an electron beam ion trap (1997) (5)
- Application to argon ions of a new technique to measure the two-electron contribution to the ground state energy of helium-like ions (2000) (5)
- QSNET, a network of clocks for measuring the stability of fundamental constants (2021) (4)
- Chapter 10: Optical Atomic Clocks in Ion Traps (2014) (4)
- Absolute frequency measurement of the ytterbium ion E3 optical clock transition using international atomic time (2018) (4)
- AN OPTICAL CLOCK BASED ON A SINGLE TRAPPED 88Sr+ ION (2009) (4)
- Hydrogenic systems for calculable frequency standards: status and options. (2001) (4)
- Editorial Introduction to the Special Issue on the IEEE International Frequency Control Symposium (IFCS) and European Frequency and Time Forum (EFTF) (2018) (4)
- Metrology: Lattice clocks embrace ytterbium (2009) (4)
- Determination of optimized frequency and frequency ratio values from over-determined sets of clock comparison data (2016) (4)
- Femtosecond optical frequency comb measurements of lasers stabilised to transitions in 88Sr+, 171Yb+ and I2 at NPL. (2002) (4)
- Trapped Ion Optical Clocks at NPL (2006) (4)
- Laser Spectroscopy of the 2S Lamb Shift in Hydrogenic Silicon (2001) (3)
- Frequency measurement of the 2S1/2_2D3/2 electric quadrupole transition in a single 171yb+ ion (2010) (3)
- A passive optical frequency comb for frequency metrology in the 1.5 micron optical communications band (2002) (3)
- Control of terahertz pulse generation by optical pulse shaping (2007) (3)
- Lamb shift, fine structure and hyperfine structure in helium like ions by fast beam laser spectroscopy (2000) (3)
- Studies of the ionization balance in an electron beam ion trap (1997) (3)
- Simultaneous time and frequency transfer over a 158-km-long fiber network using a mode-locked laser (2015) (2)
- Extending the Range and Utility of Femtosecond Combs (2004) (2)
- Time Trials for Fundamental Constants (2014) (2)
- Feasibility and applications of optical clocks as frequency and time references in ESA deep space stations (2007) (2)
- How Big Is the Proton? (2013) (2)
- Femtosecond optical frequency comb measurements at NPL (2002) (2)
- Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network (2022) (2)
- The CCL-K11 ongoing key comparison. Final report for the year 2013 (2015) (2)
- Opportunities Knock with a More Stable Optical Clock (2013) (1)
- Strontium ion optical frequency standard with Hz-level uncertainty (2005) (1)
- Microwave frequency transfer by propagation of an optical frequency comb over optical fibre (2009) (1)
- Geodesy and metrology with a transportable optical clock (2018) (1)
- Trapped strontium ion optical clock (2017) (1)
- Precision Measurement of the 1 s 2 p 3 P 2-3 P 1 Fine Structure Interval in Heliumlike Fluorine (1999) (1)
- Noise-insensitive self-referencing interferometer for carrierenvelope offset frequency stabilization of a Ti:sapphire laser (2010) (1)
- Fibre transfer of high stability microwave references with optical frequency combs (2008) (1)
- Precision spectroscopy of atomic hydrogen for an improved Rydberg constant determination (2008) (1)
- Frequency measurement of the S-2(1/2)-D-2(3/2) electric quadrupole transition in a single Yb-171(+) ion. (2010) (1)
- Frequency comb-based time transfer over a 159 km long fiber network. (2017) (1)
- A brief history of timekeeping (2018) (1)
- Analysis of atomic-clock data to constrain variations of fundamental constants (2023) (1)
- A matter of time (2017) (1)
- Absolute Frequency Measurements of 1.5 Micron Acetylene-Stabilized Lasers (2004) (1)
- Optical frequency standards based on a cooled strontium ion (2002) (1)
- Femtosecond comb measurements of optical frequency standards at NPL (2002) (1)
- Improvements to the robustness of a Ti: sapphire-based femtosecond comb at NPL. (2009) (1)
- Optical frequency standards and clocks based on single trapped ions (2006) (1)
- Building a Resilient Enhanced Time Scale Infrastructure for the UK: National Timing Centre Programme Overview (2021) (1)
- Comparison of Two Femtosecond Optical Frequency Combs at NPL (2004) (1)
- Determination of the Quadrupole Frequency Shift of the 2S1/2 - 2D5/2 Transition in 88Sr+ at 674 nm (2004) (1)
- Optical frequency measurements using femtosecond combs (2006) (0)
- ITOC: International Timescales with Optical Clocks (2015) (0)
- Transfer of ultra-low phase noise microwave references over the JANET Aurora fibre network using a femtosecond optical frequency comb (2010) (0)
- Optical frequency combs and applications at NPL (2010) (0)
- Recent research using the Oxford electron beam ion trap (1998) (0)
- Absolute frequency measurement and narrow optical spectra of the 467 nm electric octupole transition in 171Yb (2003) (0)
- An optical frequency chain for absolute frequency measurement of the 445 THz strontium trapped ion frequency standard (2000) (0)
- MICROWAVE AND OPTICAL FREQUENCY TRANSFER VIA OPTICAL FIBRE (2009) (0)
- Optical Atomic Clocks: From International Timekeeping to Gravity Potential Measurement (2019) (0)
- Coherent networks: Moving metrology (2007) (0)
- Frequency Measurements of 778 nm Rubidium Two Photon Diode Laser Standards (2004) (0)
- OPTICAL SPECTROSCOPY OF ATOMIC HYDROGEN FOR AN IMPROVED DETERMINATION OF THE RYDBERG CONSTANT (2009) (0)
- Femtosecond laser combs for optical measurement at NPL. (2001) (0)
- High Accuracy Absolute Long Distance Metrology using femtosecond lasers: Optical frequency combs and spectral interference techniques (2008) (0)
- Absolute frequency measurements of acetylene-stabilized diode laser frequency standards (2003) (0)
- A 3 THz wide optical frequency comb for the NPL methance-to-stontium frequency chain. (2000) (0)
- Optical frequency synthesis in the near IR with application to trapped ion standards (1999) (0)
- International Conference on Space Optics — ICSO 2006 Noordwijk , Netherlands 27 – 30 June 2006 Trapped strontium ion optical clock (2019) (0)
- Trapped ion optical frequency standards and metrology (2003) (0)
- An 171Yb+ optical frequency standard at 467 nm. (2006) (0)
- Measuring the stability of fundamental constants with a network of clocks (2022) (0)
- Mode-locked lasers for remote intercomparison of frequency standards over optical fibre networks. (2007) (0)
- a TRAPPED 171 Yb + ION OPTICAL FREQUENCY STANDARD BASED ON THE S 1/2 - F 7/2 TRANSITION (2009) (0)
- VII International Symposium and Young Scientists School “Modern Problems of Laser Physics” (2017) (0)
- Precision Spectroscopy of Metastable Atomic Hydrogen: Towards an Improved Determination of the Rydberg Constant (2004) (0)
- Development of a pair of 1.5 micron NICE ohms frequency standards. (2006) (0)
- Absolute frequency measurements of 1.55 /spl mu/m diode laser acetylene standards (2005) (0)
- Sr Lattice Clocks at NPL (2018) (0)
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