Publications
267 results found
Hopkins SA, Butler K, Guttridge A, et al., 2016, A versatile dual-species Zeeman slower for caesium and ytterbium, Review of Scientific Instruments, Vol: 87, ISSN: 1089-7623
We describe the design, construction, and operation of a versatile dual-species Zeeman slower for both Cs and Yb, which is easily adaptable for use with other alkali metals and alkaline earths. With the aid of analytic models and numerical simulation of decelerator action, we highlight several real-world problems affecting the performance of a slower and discuss effective solutions. To capture Yb into a magneto-optical trap(MOT), we use the broad ¹S0 to ¹P1 transition at 399 nm for the slower and the narrow ¹S0 to ³P1 intercombination line at 556 nm for the MOT. The Cs MOT and slower both use the D2 line (6²S1/2 to 6²P3/2 at 852 nm. The slower can be switched between loading Yb or Cs in under 0.1 s. We demonstrate that within a few seconds the Zeeman slower loads more than 10⁹ Yb atoms and 10⁸ Cs atoms into their respective MOTs. These are ideal starting numbers for further experiments on ultracold mixtures and molecules.
Polisseni C, Major K, Boissier S, et al., 2016, A stable, single-photon emitter in a thin organic crystal for application to quantum-photonic devices, Optics Express, ISSN: 1094-4087
Kemp SL, Butler KL, Freytag R, et al., 2016, Production and characterization of a dual species magneto-optical trap of cesium and ytterbium, Review of Scientific Instruments, Vol: 87, ISSN: 1089-7623
We describe an apparatus designed to trap and cool a Yb and Cs mixture. The apparatus consists of a dual species effusive oven source, dual species Zeeman slower, magneto-optical traps in a single ultra-high vacuum science chamber, and the associated laser systems. The dual species Zeeman slower is used to load sequentially the two species into their respective traps. Its design is flexible and may be adapted for other experiments with different mixtures of atomic species. The apparatus provides excellent optical access and can apply large magnetic bias fields to the trapped atoms. The apparatus regularly produces 108 Cs atoms at 13.3 μK in an optical molasses, and 109174Y b atoms cooled to 22 μK in a narrowband magneto-optical trap.
Yuen B, Barr I, Cotter J, et al., 2015, Enhanced oscillation lifetime of a Bose–Einstein condensate in the 3D/1D crossover, New Journal of Physics, Vol: 17, ISSN: 1367-2630
We have measured the damped motion of a trapped Bose–Einstein condensate, oscillating withrespect to a thermal cloud. The cigar-shaped trapping potential provides enough transverseconfinement that the dynamics of the system are intermediate between three-dimensional and onedimensional.We find that the scaling of the damping rate with temperature is consistent with Landautheory, but that the damping rate for axial oscillations at a given temperature is consistently smallerthan expected for a three-dimensional gas. We attribute this to the suppressed density of states forlow-energy transverse excitations(essential excitations for axial Landau damping), which results fromthe quantization of the radial motion.
major K, lien Y, polisseni C, et al., 2015, Growth of optical-quality anthracene crystals, doped with dibenzoterrylenefor controlled single photon production, Review of Scientific Instruments, Vol: 86, ISSN: 1089-7623
Dibenzoterrylene (DBT) molecules within a crystalline anthracene matrix show promise as quantum emitters for controlled, single photon production. We present the design and construction of a chamber in which we reproducibly grow doped anthracene crystals of optical quality that are several mm across and a few micrometres thick. We demonstrate control of the DBT concentration over the range 6 { 300 parts per trillion and show that these DBT molecules are stable single-photon emitters. We interpret our data with a simple model that provides some information on the vapour pressure of DBT.
Burrage C, Copeland EJ, Hinds EA, 2015, Probing dark energy with atom interferometry, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, ISSN: 1475-7516
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- Citations: 90
Dunseith DP, Truppe S, Hendricks RJ, et al., 2015, A high quality, efficiently coupled microwave cavity for trapping cold molecules, Journal of Physics B - Atomic Molecular and Optical Physics, Vol: 48, ISSN: 0953-4075
Polisseni C, Kho KW, Grandi S, et al., 2015, Novel method of sub-wavelength thin film growth for single photon emission from dye molecules
Polisseni C, Kho KW, Grandi S, et al., 2015, Novel method of sub-wavelength thin film growth for single photon emission from dye molecules
Verhart NR, Lepert G, Billing AL, et al., 2014, Single dipole evanescently coupled to a multimode waveguide, OPTICS EXPRESS, Vol: 22, Pages: 19633-19640, ISSN: 1094-4087
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- Citations: 13
Polisseni C, Kho KW, Grandi S, et al., 2014, Novel method of sub-wavelength thin film growth for single photon emission from dye molecules
Polisseni C, Kho KW, Grandi S, et al., 2014, Novel method of sub-wavelength thin film growth for single photon emission from dye molecules
Smallman IJ, Wang F, Steimle TC, et al., 2014, Radiative branching ratios for excited states of <SUP>174</SUP>YbF: Application to laser cooling, JOURNAL OF MOLECULAR SPECTROSCOPY, Vol: 300, Pages: 3-6, ISSN: 0022-2852
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- Citations: 28
Truppe S, Hendricks RJ, Tokunaga SK, et al., 2014, Microwave spectroscopy of A-doublet transitions in the ground state of CH, JOURNAL OF MOLECULAR SPECTROSCOPY, Vol: 300, Pages: 70-78, ISSN: 0022-2852
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- Citations: 9
Zhelyazkova V, Cournol A, Wall TE, et al., 2014, Laser cooling and slowing of CaF molecules, Physical Review A, Vol: 89, ISSN: 1094-1622
We demonstrate slowing and longitudinal cooling of a supersonic beam of CaF molecules using counterpropagating laser light resonant with a closed rotational and almost-closed vibrational transition. A group of molecules are decelerated by about 20 m/s by applying light of a fixed frequency for 1.8 ms. Their velocity spread is reduced, corresponding to a final temperature of about 300 mK. The velocity is further reduced by chirping the frequency of the light to keep it in resonance as the molecules slow down.
Hinds EA, Truppe S, Hendricks RJ, et al., 2014, Microwave spectroscopy of Λ-doublet transitions in the ground state of CH, Journal of Molecular Spectroscopy, ISSN: 0022-2852
Hudson JJ, Tarbutt MR, Sauer BE, et al., 2014, Stochastic multi-channel lock-in detection, NEW JOURNAL OF PHYSICS, Vol: 16, ISSN: 1367-2630
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- Citations: 3
Lepert G, Hinds EA, 2014, Integrated optics for coupled-cavity QED, 11th International Conference on Quantum Communication, Measurement and Computing (QCMC), Publisher: AMER INST PHYSICS, Pages: 234-236, ISSN: 0094-243X
Truppe S, Hendricks RJ, Hinds EA, et al., 2013, Measurement of the lowest millimeter-wave transition frequency of the CH radical, Astrophysical Journal, Vol: 780, ISSN: 1538-4357
The CH radical offers a sensitive way to test the hypothesis that fundamental constants measured on earth may differ from those observed in other parts of the universe. The starting point for such a comparison is to have accurate laboratory frequencies. Here, we measure the frequency of the lowest millimeter-wave transition of CH, near 535 GHz, with an accuracy of 0.6 kHz. This improves the uncertainty by roughly two orders of magnitude over previous determinations and opens the way for sensitive new tests of varying constants.
Hinds EA, 2013, Is the electron round? Particle physics with cold and ultracold molecular beams
Nshii CC, Vangeleyn M, Cotter JP, et al., 2013, Magneto-optical traps on a chip using micro-fabricated gratings
Cotter JP, Zeimpekis I, Kraft M, et al., 2013, Improved surface quality of anisotropically etched silicon {111} planes for mm-scale optics, 12th International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS), Publisher: IOP PUBLISHING LTD, ISSN: 0960-1317
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- Citations: 3
Truppe S, Hendricks RJ, Tokunaga SK, et al., 2013, A search for varying fundamental constants using hertz-level frequency measurements of cold CH molecules, Nature Communications, Vol: 4, ISSN: 2041-1723
Many modern theories predict that the fundamental constants depend on time, position or the local density of matter. Here we develop a spectroscopic method for pulsed beams of cold molecules, and use it to measure the frequencies of microwave transitions in CH with accuracy down to 3 Hz. By comparing these frequencies with those measured from sources of CH in the Milky Way, we test the hypothesis that fundamental constants may differ between the high- and low-density environments of the Earth and the interstellar medium. For the fine structure constant we find Δα/α=(0.3±1.1) × 10−7, the strongest limit to date on such a variation of α. For the electron-to-proton mass ratio we find Δμ/μ=(−0.7±2.2) × 10−7. We suggest how dedicated astrophysical measurements can improve these constraints further and can also constrain temporal variation of the constants.
Garcia IL, Darquie B, Sinclair CDJ, et al., 2013, Shaking-induced dynamics of cold atoms in magnetic traps, PHYSICAL REVIEW A, Vol: 88, ISSN: 1050-2947
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- Citations: 4
Lepert G, Hinds EA, Rogers HL, et al., 2013, Elementary array of Fabry-Perot waveguide resonators with tunable coupling, APPLIED PHYSICS LETTERS, Vol: 103, ISSN: 0003-6951
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- Citations: 5
Bulleid NE, Skoff SM, Hendricks RJ, et al., 2013, Characterization of a cryogenic beam source for atoms and molecules, Phys. Chem. Chem. Phys.
Tarbutt MR, Sauer BE, Hudson JJ, 2013, Design for a fountain of YbF molecules to measure the electron's electric dipole moment, New Journal of Physics, Vol: 15
Nshii CC, Vangeleyn M, Cotter JP, et al., 2013, A surface-patterned chip as a strong source of ultracold atoms for quantum technologies, NATURE NANOTECHNOLOGY, Vol: 8, Pages: 321-324, ISSN: 1748-3387
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- Citations: 106
Sauer BE, Devlin JA, Hudson JJ, et al., 2013, Time reversal symmetry violation in the YbF molecule, HYPERFINE INTERACTIONS, Vol: 214, Pages: 119-126, ISSN: 0304-3843
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- Citations: 2
Nshii CC, Vangeleyn M, Cotter JP, et al., 2013, Magneto-optical traps on a chip using micro-fabricated gratings, Conference on Lasers and Electro-Optics Europe & International Quantum Electronics Conference (CLEO/Europe-IQEC), Publisher: IEEE
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