DOCSLIB.ORG

POSTER LIST Poster Number

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
POSTER LIST Poster Number POSTER LIST Poster number Monday 23rd July TOPIC: ATOMIC CLOCKS AND QUANTUM METROLOGY Sensing beyond the Heisenberg limit Tarun Dutta CQT, National University of Singapore .........................................................................................................................1 A master oscillator based on 48.5 cm long optical cavity as a reference for a universal synthesizer Marco Schioppo National Physical Laboratory ..............................................................................................................................2 + E2 transitions between hyperfine structure components of the D 2 molecular ion Petar Danev INRNE, BAS ..................................................................................................................................................................3 Measurement of the Infrared Magic Wavelengths for the 40Ca+ Ion Clock Transition Kelin Gao Wuhan Institute of Physics and Mathematics (WIPM) of Chinese Academy of Sciences ...................................................4 Progress towards deployable primary pressure sensors based on lithium magneto-optical traps Daniel Barker National Institute of Standards and Technology .......................................................................................................5 Onsite calibration of time and length standards for atom gravimeters Duan Xiaochun Huazhong University of Science & Technology .....................................................................................................6 Quantum Logic Spectroscopy with a 40Ca+/27Al+ mixed ion crystal Milena Guevara-Bertsch Institut for quantum optics and quantum information .......................................................................7 Comparing Optical Clocks at 10-18 level Holly Leopardi NIST/ University of Colorado ...................................................................................................................................8 Transortable optical lattice clock-measurement campaigns and characterisation Silvio Koller PTB ...............................................................................................................................................................................9 Spin squeezing of an atomic ensemble with 1011 atoms Han Bao Fudan University ...............................................................................................................................................................10 Micro-integrated extended cavity diode laser with integrated optical amplifier for precision spectroscopy in space Christian Kürbis Ferdinand-Braun-Institut ...................................................................................................................................11 Quantum metrology of displacements with diffusion: single photon recoil spectroscopy Marius Schulte Leibniz University Hannover .................................................................................................................................12 Progress on a compact Yb+ optical clock Marion Delehaye Femto-ST .........................................................................................................................................................13 Explore cesium nuclear magnetic octupole moment with electronic 6S1/2 6D3/2 hyperfine transitions Wang-Yau Cheng Department of Physics, National Central University........................................................................................14 Remote and local comparisons of optical atomic clocks for geodesy and metrology Filippo Bregolin INRIM Istituto Nazionale di Ricerca Metrologica ................................................................................................15 The system of intra-object transmission of the strontium optical clock frequency to the primary standard of units of time, frequency and the national time scale Denis Sutyrin FSUE ‘VNIIFTRI’ ........................................................................................................................................................16 1 POSTER LIST Poster number Development of optical clock modules for the creation of a portable optical frequency clock on ytterbium atoms Gleb Belotelov FSUE ‘VNIIFTRI’ .....................................................................................................................................................17 Cryogenic multi-path cavity made of monocrystalline silicon Piotr Morzyński National Institute of Information and Communications Technology .................................................................18 An optical frequency comb stabilized to an optical lattice clock laser through optical fiber networks Eunmi Chae The University of Tokyo ..............................................................................................................................................19 Weak measurement correlation spectroscopy for magnetic field sensing Qu Weizhi Fudan University ...........................................................................................................................................................20 Theory of the high-quality magneto-optical resonances observed in a buffer-gas-filled vapour cell Aleksey Novokreshchenov Institute of Laser Physics SB RAS ....................................................................................................21 High-sensitive all-optical magnetometer for nuclear magnetic resonance gyroscope Xinye Xu East China Normal University...........................................................................................................................................22 A mercury optical lattice clock Valentin Cambier CNRS SYRTE OP SU LNE....................................................................................................................................23 Sideband cooling and transport of cold ytterbium atoms in a one-dimensional optical lattice Xinye Xu East China Normal University...........................................................................................................................................24 TOPIC: COLD MOLECULES Ultracold Triplet Ground State 23Na6Li Molecules Hyungmok Son Harvard University/MIT ......................................................................................................................................25 Two interacting molecules in a one-dimensional harmonic trap Anna Dawid-Łękowska University of Warsaw ...........................................................................................................................26 Fermi degeneracy and evaporation in a gas of reactive polar molecules Giacomo Valtolina JILA - CU Boulder ...........................................................................................................................................27 Direct measurement of branching ratios, and progress towards laser cooling of barium monohydride Rees McNally Columbia University ................................................................................................................................................28 Interactions of benzene, naphthalene, and azulene with alkali-metal and alkaline-earth-metal atoms for ultracold studies Pawel Wójcik University of Warsaw ...............................................................................................................................................29 Isotopic shift of atom-dimer Efimov resonances in K-Rb mixtures Kohei Kato Osaka city university ....................................................................................................................................................30 Two-photon spectroscopy of ultracold dipolar 6Li - 40K molecules Sofia Botsi Centre for Quantum Technologies, National University of Singapore ..........................................................................31 Testing the parity symmetry in chiral molecules using vibrational spectroscopy Mathieu Manceau Laboratoire de physique des Lasers ...............................................................................................................32 Towards laser cooling of AlF molecules Stefan Truppe Fritz Haber Institute of the Max Planck Society ......................................................................................................33 2 POSTER LIST Poster number Ultracold Lithium for Sympathetically Cooling Polar Molecules Sidney Wright Imperial College London .......................................................................................................................................34 Collision studies of slow, cold polyatomic molecules Isabel Rabey Max-Planck-Institut für Quantenoptik......................................................................................................................35 Long Coherence Times in Trapped RbCs Jacob Blackmore Durham University ...........................................................................................................................................36 Magic-Wavelength Molecular Clock and Ultracold Chemistry With Lattice-Trapped Molecules Christian Liedl Columbia University ..............................................................................................................................................37 Photoassociation and photoionization in a two-species Rb-Hg MOT Marcin Witkowski Institute of Physics University of Opole ...........................................................................................................38 Towards quantum
Load more

Recommended publications
  • An Intense, Highly Collimated Continuous Cesium Fountain
    Observatoire cantonal de Neuchˆatel - Universit´ede Neuchˆatel An intense, highly collimated continuous cesium fountain Th`ese pr´esent´ee`ala Facult´edes Sciences pour l’obtention du grade de docteur `es sciences par: Natascia Castagna Physicienne licenci´ee de l’Universit`adi Torino (Italie) accept´eele 20 avril 2006 par les membres du jury: Prof. P. Thomann Rapporteur Dr. S. Gu´erandel Corapporteur Prof. T. Esslinger Corapporteur Prof. J. Faist Corapporteur Neuchˆatel,juillet 2006 ii iii Mots cl´es: horloges atomiques, atomes froids, refroidissement et pi´egeage d’atomes par laser. Keywords: atomic clocks, cold atoms, laser cooling and trapping. Abstract The realisation of cold and slow atomic beams has opened the way to a series of precision measurements of high scientific interest, as atom interferometry, Bose-Einstein Condensation and atomic fountain clocks. The latter are used since several years as reference clocks, given the high perfor- mance that they can reach both in accuracy and stability. The common philosophy in the construction of atomic fountains has been the pulsed tech- nique, where an atoms sample is launched vertically and then falls down un- der the effect of the gravity. The Observatoire de Neuchˆatel had a different approach and has built a fountain clock (FOCS1) operating in a continuous mode. This technique offers two main advantages: the diminution of the un- desirable effects due to the atomic density (e.g. collisions between the atoms and cavity pulling) and to the noise of the local oscillator (intermodulation effect). To take full advantage of the continuous fountain approach how- ever, we need to increase the atomic flux.
    [Show full text]
  • Gray Molasses Cooling of Lithium-6 Towards a Degenerate Fermi Gas
    Department of Physics and Astronomy University of Heidelberg Master thesis in Physics submitted by Manuel Gerken born in Frankfurt am Main 2016 Gray Molasses Cooling of Lithium-6 Towards a Degenerate Fermi Gas This Master thesis has been carried out by Manuel Gerken at the Physikalisches Institut Heidelberg under the supervision of Prof. Dr. Matthias Weidemüller iv Kühlen mit grauer Melasse zur Realisierung eines entarteten Fermi Gases Die vorliegende Arbeit beschreibt das Design, die Implementierung und die Charakteri- sierung einer Kühlung in grauer Melasse auf der D1 Linie von Lithium-6 Atomen. Durch diese zusätzliche Laser-Kühlung erreichen wir sub-Doppler Temperaturen für eine an- fänglich magneto-optisch gefangenes Gas und erhöhen seine Phasenraumdichte um einen Faktor von etwa 10. Kühlen mit grauer Melasse kombiniert die geschwindigkeitsabhängige Besetzung eines kohärenten Dunkelzustands mit einem sisyphusartigen Kühlprozess auf einer ortsabhän- gigen Energieverschiebung. Wir präsentieren Berechnungen und Analysen von bekleide- ten Energiezuständen von Lithium-6 in ein- und dreidimensionalen Polarisationsgradien- tenfeldern. Dieser erzeugen die ortsabhängige Energieverschiebung für die Kühlung mit grauer Melasse. Wir beschreiben die Planung und den Aufbau des Experiments, in dem 3.2×107 Atome innerhalb von 1 ms von 240 µK auf 42 µK herabgekühlt werden. Dies ent- spricht einer Einfangeffizienz von 80% gegenüber der anfangs in der magneto-optischen Falle hergestellten Probe. Wir messen die Auswirkungen von Frequenzverstimmung, Dau- er, Magnetfeld und Lichtintensitäten auf den Kühlprozess um optimale Parameter zu er- halten. Wir diskutieren, wie die erhöhte Phasenraumdichte die Übertragungseffizienz in die optische Dipolfalle verbessert. Die verbesserten Ausgangsbedingungen für evaporati- ves Kühlen ermöglichen es uns, ein stark entartetes Fermigas herzustellen, der Grundbau- stein für die Generierung einer suprafluiden Bose-Fermi-Mischung und die Untersuchung von Fermi Polaronen.
    [Show full text]
  • PHYS598 AQG Introduction to the Course
    Laser-cooling and trapping (some history) Theory (neutral atoms) Hansch & Schawlow, 1975 Laser-cooling and trapping (some history) Theory (neutral atoms) Hansch & Schawlow, 1975 (trapped ions) Wineland & Dehmelt, 1975 (neutral atoms) Ashkin, 1978 Laser-cooling and trapping (some history) Theory (neutral atoms) Hansch & Schawlow, 1975 (trapped ions) Wineland & Dehmelt, 1975 (neutral atoms) Ashkin, 1978 Experiments (ions) Wineland, Drullinger, Walls, 1978 (ions) Neuhauser, Hohenstatt, Toschek & Dehmelt, 1978 Atom slowing experiments in 1980s, and then: 3D molasses of neutral atoms: Chu, Hollberg, Bjorkholm, Cable & Ashkin, 1985 First 3D molasses, with neutral sodium Based on “release and recapture,” measured temperatures ~TDoppler ~240 μK Another 3D molasses of neutral sodium and a surprise! (1988) Lett, Watts, Westbrook, Phillips, Gould & Metcalf Atoms a lot colder than expected! Another 3D molasses of neutral sodium and a surprise! (1988) Lett, Watts, Westbrook, Phillips, Gould & Metcalf min δ Dopp = Γ / 2 Strange dependence on detuning! reason: real atoms have more than 2 levels! polarization gradient cooling (Cohen-Tannoudji, Dalibard, others) Another 3D molasses of neutral sodium and a surprise! (1988) Lett, Watts, Westbrook, Phillips, Gould & Metcalf min δ Dopp = Γ / 2 1997 Nobel Prize in Physics Chu, Phillips, Cohen- StrangeTannoudji dependence on detuning! “for development of methods real atoms have more than 2 levels! reason: to cool and trap atoms with polarizationlaser gradient light” cooling (Cohen-Tannoudji, Dalibard, others)
    [Show full text]
  • Gray Molasses Cooling of 39K to a High Phase-Space Density Guillaume Salomon, Lauriane Fouché, Pengjun Wang, Alain Aspect, Philippe Bouyer, Thomas Bourdel
    Gray molasses cooling of 39K to a high phase-space density Guillaume Salomon, Lauriane Fouché, Pengjun Wang, Alain Aspect, Philippe Bouyer, Thomas Bourdel To cite this version: Guillaume Salomon, Lauriane Fouché, Pengjun Wang, Alain Aspect, Philippe Bouyer, et al.. Gray molasses cooling of 39K to a high phase-space density. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2013, 104, pp.63002. 10.1209/0295- 5075/104/63002. hal-00870074 HAL Id: hal-00870074 https://hal.archives-ouvertes.fr/hal-00870074 Submitted on 4 Oct 2013 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. epl draft Gray molasses cooling of 39K to a high phase-space density G. Salomon1 , L. Fouche´1 , P. Wang1 (a), A. Aspect1 , P. Bouyer2 and T. Bourdel1 (b) 1 Laboratoire Charles Fabry, Institut d’Optique, CNRS, Univ Paris-Sud, 2, Avenue Augustin Fresnel, 91127 PALAISEAU CEDEX, France 2 LP2N, Univ Bordeaux 1, IOGS, CNRS, 351 cours de la Lib´eration, 33405 Talence, France PACS 37.10.De – Atom cooling methods PACS 37.10.Gh – Atom traps and guides PACS 67.85.-d – Ultracold gases, trapped gases Abstract.
    [Show full text]
  • Laser Cooling and Slowing of a Diatomic Molecule John F
    Abstract Laser cooling and slowing of a diatomic molecule John F. Barry 2013 Laser cooling and trapping are central to modern atomic physics. It has been roughly three decades since laser cooling techniques produced ultracold atoms, leading to rapid advances in a vast array of fields and a number of Nobel prizes. Prior to the work presented in this thesis, laser cooling had not yet been extended to molecules because of their complex internal structure. However, this complex- ity makes molecules potentially useful for a wide range of applications. The first direct laser cooling of a molecule and further results we present here provide a new route to ultracold temperatures for molecules. In particular, these methods bridge the gap between ultracold temperatures and the approximately 1 kelvin temperatures attainable with directly cooled molecules (e.g. with cryogenic buffer gas cooling or decelerated supersonic beams). Using the carefully chosen molecule strontium monofluoride (SrF), decays to unwanted vibrational states are suppressed. Driving a transition with rotational quantum number R=1 to an excited state with R0=0 eliminates decays to unwanted ro- tational states. The dark ground-state Zeeman sublevels present in this specific scheme are remixed via a static magnetic field. Using three lasers for this scheme, a given molecule should undergo an average of approximately 100; 000 photon absorption/emission cycles before being lost via un- wanted decays. This number of cycles should be sufficient to load a magneto-optical trap (MOT) of molecules. In this thesis, we demonstrate transverse cooling of an SrF beam, in both Doppler and a Sisyphus-type cooling regimes.
    [Show full text]
  • Gray-Molasses Optical-Tweezer Loading: Controlling Collisions for Scaling Atom-Array Assembly
    PHYSICAL REVIEW X 9, 011057 (2019) Gray-Molasses Optical-Tweezer Loading: Controlling Collisions for Scaling Atom-Array Assembly † M. O. Brown,* T. Thiele,* C. Kiehl, T.-W. Hsu, and C. A. Regal JILA, National Institute of Standards and Technology and University of Colorado, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA (Received 21 November 2018; revised manuscript received 5 January 2019; published 29 March 2019) To isolate individual neutral atoms in microtraps, experimenters have long harnessed molecular photo- association to make atom distributions sub-Poissonian. While a variety of approaches have used a combi- nation of attractive (red-detuned) and repulsive (blue-detuned) molecular states, to date all experiments have been predicated on red-detuned cooling. In our work, we present a shifted perspective—namely, the efficient way to capture single atoms is to eliminate red-detuned light in the loading stage and use blue- detuned light that both cools the atoms and precisely controls trap loss through the amount of energy released during atom-atom collisions in the photoassociation process. Subsequent application of red- detuned light then assures the preparation of maximally one atom in the trap. Using Λ-enhanced gray- molasses for loading, we study and model the molecular processes and find we can trap single atoms with 90% probability even in a very shallow optical tweezer. Using 100 traps loaded with 80% probability, we demonstrate one example of the power of enhanced loading by assembling a grid of 36 atoms using only a single move of rows and columns in 2D. Our insight is key in scaling the number of particles in a bottom-up quantum simulation and computation with atoms, or even molecules.
    [Show full text]
  • Sub-Doppler Cooling of Fermionic Lithium
    Sub-Doppler Cooling of Fermionic Lithium A master thesis submitted to the FACULTY OF MATHEMATICS,COMPUTER SCIENCE AND PHYSICS, OF THE LEOPOLD-FRANZENS UNIVERSITY OF INNSBRUCK in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE carried out at the Institute for Quantum Optics and Quantum Information, and the Institute for Experimental Physics at the University of Innsbruck under the supervision of Univ.-Prof. Dr. Rudolf Grimm presented by ISABELLA FRITSCHE BSC JUNE 2015 Abstract In our experimental approach to prepare strongly interacting Li-K mixtures, fermionic 6Li acts as the cooling agent. The high temperature of 6Li in the standard magneto-optical trap (MOT), operated on the D2 transition, limits the efficiency. To overcome this limitation, we implement a gray molasses cooling scheme on the D1 transition to reach sub-Doppler temperatures. In this technique, cooling arises from the Sisyphus effect in combination with a sharp cooling feature near the Raman transition where the two ground states (F = 1=2 and F = 3=2) are coupled via two lasers, blue detuned from the F 0 = 3=2 excited state of the D1 transition. With our experimental setup we can access a wide parameter range, in which the system can be characterized. By using separate light paths for the gray molasses and the MOT, we are able to investigate the influence of different polarizations and intensities on the D1 cooling feature. This enables us to cool our Li atoms from initially ∼ 250 µK after the MOT to temperatures below 50 µK. The very robust cooling technique offers us better starting conditions for our optical dipole trap, where Li sympathetically cools K.
    [Show full text]
  • Sub-Doppler Laser Cooling of Fermionic 40K Atoms in Three-Dimensional Gray Optical Molasses
    epl draft Sub-Doppler laser cooling of fermionic 40K atoms in three- dimensional gray optical molasses D. Rio Fernandes1 (a) (b), F. Sievers1 (a) (c), N. Kretzschmar1, S. Wu2, C. Salomon1 and F. Chevy1 1 Laboratoire Kastler-Brossel, Ecole´ Normale Sup´erieure, CNRS and UPMC - 24 rue Lhomond, 75005 Paris, France 2 Department of Physics, College of Science, Swansea University, Swansea, SA2 8PP. United Kingdom PACS 37.10.De { Atom cooling methods PACS 37.10.Gh { Atom traps and guides PACS 67.85.-d { Ultracold gases, trapped gases 40 Abstract { We demonstrate sub-Doppler cooling of K on the D1 atomic transition. Using a gray molasses scheme, we efficiently cool a compressed cloud of 6:5 × 108 atoms from ∼ 4 mK to 20 µK in 8 ms. After transfer in a quadrupole magnetic trap, we measure a phase space density of ∼ 10−5. This technique offers a promising route for fast evaporation of fermionic 40K. Introduction. { Cooling of fermionic atomic species schemes have produced 40K temperatures of ∼ 15 µK, but has played a fundamental role in the study of strongly with only reduced atom numbers (∼ 107) [5, 7, 8]. This correlated Fermi gases, notably through the experimental relatively poor efficiency is due to the combination of the exploration of the BCS-BEC crossover, the observation fairly narrow and inverted hyperfine level structure of the of the Clogston-Chandrasekhar limit to superfluidity, the P3=2 excited state which results in the washing out of the observation of the Mott-insulator transition in optical lat- capture velocity of the molasses when the laser detun- tices, and the study of low dimensional systems (see for ing is increased [9].
    [Show full text]
  • Sub-Doppler Laser Cooling of Fermionic 40K Atoms in Three-Dimensional Gray Optical Molasses Diogo Rio Fernandes, Franz Sievers, Norman Kretzschmar, Saijun Wu, C
    Sub-Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses Diogo Rio Fernandes, Franz Sievers, Norman Kretzschmar, Saijun Wu, C. Salomon, Frédéric Chevy To cite this version: Diogo Rio Fernandes, Franz Sievers, Norman Kretzschmar, Saijun Wu, C. Salomon, et al.. Sub- Doppler laser cooling of fermionic 40K atoms in three-dimensional gray optical molasses. 2012. hal- 00738260 HAL Id: hal-00738260 https://hal.archives-ouvertes.fr/hal-00738260 Preprint submitted on 3 Oct 2012 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. epl draft Sub-Doppler laser cooling of fermionic 40K atoms in three- dimensional gray optical molasses D. Rio Fernandes1 (a) (b), F. Sievers1 (a) (c), N. Kretzschmar1, S. Wu2, C. Salomon1 and F. Chevy1 1 Laboratoire Kastler-Brossel, Ecole´ Normale Sup´erieure, CNRS and UPMC - 24 rue Lhomond, 75005 Paris, France 2 Department of Physics, College of Science, Swansea University, Swansea, SA2 8PP. United Kingdom PACS 37.10.De { Atom cooling methods PACS 37.10.Gh { Atom traps and guides PACS 67.85.-d { Ultracold gases, trapped gases 40 Abstract { We demonstrate sub-Doppler cooling of K on the D1 atomic transition.
    [Show full text]
  • Arxiv:1803.05108V2 [Cond-Mat.Quant-Gas]
    23 Sub-Doppler laser cooling of Na in gray molasses on the D2 line Zhenlian Shi,1, 2 Ziliang Li,1, 2 Pengjun Wang,1,2, ∗ Zengming Meng,1, 2 Lianghui Huang,1, 2 and Jing Zhang1,2, † 1State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics, Shanxi University, Taiyuan, Shanxi 030006, China 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China We report on the efficient gray molasses cooling of sodium atoms using the D2 optical transition at 589.1 nm. Thanks to the hyperfine split about 6Γ between the |F ′ = 2i and |F ′ = 3i in the 2 excited state 3 P3/2, this atomic transition is effective for the gray molasses cooling mechanism. Using this cooling technique, the atomic sample in F = 2 ground manifold is cooled from 700 µK to 56 µK in 3.5 ms. We observe that the loading efficiency into magnetic trap is increased due to the lower temperature and high phase space density of atomic cloud after gray molasses. This technique offers a promising route for the fast cooling of the sodium atoms in the F = 2 state. PACS numbers: 37.10.De, 37.10.Gh, 67.85.-d Ultracold atomic gases offer a remarkably rich many atomic species, including alkali atoms 40K,[30, 31] platform[1] to enhance our understanding of numerous 7Li,[32] 39K,[33, 34] 6Li,[31, 35] 23Na,[36] 41K,[37] and interesting phenomenon, such as coherent manipulation metastable atom 4He,[38] which was operating on the of many body states and their dynamics using quantum blue detuning of the D1 transition with more resolved gases in optical lattices,[2–5] spin orbit coupling to topo- energy spectrum.
    [Show full text]
  • (2020) Loading and Cooling in an Optical Trap Via Hyperfine Dark States
    PHYSICAL REVIEW RESEARCH 2, 013212 (2020) Loading and cooling in an optical trap via hyperfine dark states D. S. Naik,1,* H. Eneriz-Imaz,1 M. Carey ,1,2 T. Freegarde,2 F. Minardi ,3,4 B. Battelier,1 P. Bouyer,1 and A. Bertoldi 1,† 1LP2N, Laboratoire Photonique, Numérique et Nanosciences, Université Bordeaux-IOGS-CNRS:UMR 5298, F-33400 Talence, France 2School of Physics & Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom 3Istituto Nazionale di Ottica, INO-CNR, Sesto Fiorentino 50019, Italy 4Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna 40127, Italy (Received 25 November 2019; accepted 28 January 2020; published 26 February 2020) We present an optical cooling scheme that relies on hyperfine dark states to enhance loading and cooling atoms inside deep optical dipole traps. We demonstrate a sevenfold increase in the number of atoms loaded in the conservative potential with strongly shifted excited states. In addition, we use the energy selective dark state to efficiently cool the atoms trapped inside the conservative potential rapidly and without losses. Our findings open the door to optically assisted cooling of trapped atoms and molecules which lack the closed cycling transitions normally needed to achieve low temperatures and the high initial densities required for evaporative cooling. DOI: 10.1103/PhysRevResearch.2.013212 I. INTRODUCTION trap (FORT). However, the DSs are then strongly modified by the trap potential, which typically shortens their lifetime and Ultracold quantum gases have attracted much attention in eventually couples them to the light field. recent decades as versatile platforms for investigating strongly In this paper, we show that DS cooling can be used in correlated quantum systems [1] and as the basis for quantum combination with FORT when strong differential light shifts technologies exploiting atomic interferometry [2,3].
    [Show full text]
  • Sub-Doppler Cooling of Sodium Atoms in Gray Molasses
    Sub-Doppler cooling of sodium atoms in gray molasses Giacomo Colzi1;2, Gianmaria Durastante1,∗ Eleonora Fava1, Simone Serafini1, Giacomo Lamporesi1;2, and Gabriele Ferrari1;2 1 INO-CNR BEC Center and Dipartimento di Fisica, Universit`adi Trento, 38123 Povo, Italy and 2 Trento Institute for Fundamental Physics and Applications, INFN, 38123 Povo, Italy (Dated: February 23, 2016) We report on the realization of sub-Doppler laser cooling of sodium atoms in gray molasses using 2 2 the D1 optical transition (3s S1=2 ! 3p P1=2) at 589.8 nm. The technique is applied to samples containing 3 × 109 atoms, previously cooled to 350 µK in a magneto-optical trap, and it leads to temperatures as low as 9 µK and phase-space densities in the range of 10−4. The capture efficiency of the gray molasses is larger than 2/3, and we observe no density-dependent heating for densities up to 1011 cm−3. PACS numbers: 37.10.De, 32.80.Wr, 67.85.-d I. INTRODUCTION tool in addressing fundamental problems in physics and in devising cold-atom based quantum simulators [11]. Sub-Doppler laser cooling has been a well-established Velocity-selective coherent population trapping and widespread technique since the late 1980s [1]. It (VSCPT) [12] allows one to cool atoms even below 2 2 consists in using light polarization gradients and optical the photon recoil temperature limit Trec = ¯h kL=mkB pumping to cool down atoms below the Doppler tem- (where kL is the wave number and m is the atomic perature limit TD = ¯hΓ=2kB [2, 3], where ¯h is the re- mass), taking advantage of electromagnetically induced duced Planck constant, kB is the Boltzmann constant transparency [13, 14].
    [Show full text]