Littérature scientifique sur le sujet « Gray molasses cooling »
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Articles de revues sur le sujet "Gray molasses cooling"
Triché, C., P. Verkerk et G. Grynberg. « Blue-Sisyphus cooling in cesium gray molasses and antidot lattices ». European Physical Journal D - Atomic, Molecular and Optical Physics 5, no 2 (1 février 1999) : 225–28. http://dx.doi.org/10.1007/s100530050249.
Texte intégralSalomon, G., L. Fouché, P. Wang, A. Aspect, P. Bouyer et T. Bourdel. « Gray-molasses cooling of 39 K to a high phase-space density ». EPL (Europhysics Letters) 104, no 6 (1 décembre 2013) : 63002. http://dx.doi.org/10.1209/0295-5075/104/63002.
Texte intégralBoiron, D., C. Triché, D. R. Meacher, P. Verkerk et G. Grynberg. « Three-dimensional cooling of cesium atoms in four-beam gray optical molasses ». Physical Review A 52, no 5 (1 novembre 1995) : R3425—R3428. http://dx.doi.org/10.1103/physreva.52.r3425.
Texte intégralBoiron, D., A. Michaud, P. Lemonde, Y. Castin, C. Salomon, S. Weyers, K. Szymaniec, L. Cognet et A. Clairon. « Laser cooling of cesium atoms in gray optical molasses down to 1.1 μK ». Physical Review A 53, no 6 (1 juin 1996) : R3734—R3737. http://dx.doi.org/10.1103/physreva.53.r3734.
Texte intégralDobosz, Jakub, Mateusz Bocheński et Mariusz Semczuk. « Bidirectional, Analog Current Source Benchmarked with Gray Molasses-Assisted Stray Magnetic Field Compensation ». Applied Sciences 11, no 21 (8 novembre 2021) : 10474. http://dx.doi.org/10.3390/app112110474.
Texte intégralBruce, G. D., E. Haller, B. Peaudecerf, D. A. Cotta, M. Andia, S. Wu, M. Y. H. Johnson, B. W. Lovett et S. Kuhr. « Sub-Doppler laser cooling of40K with Raman gray molasses on the ${D}_{2}$ line ». Journal of Physics B : Atomic, Molecular and Optical Physics 50, no 9 (12 avril 2017) : 095002. http://dx.doi.org/10.1088/1361-6455/aa65ea.
Texte intégralRio Fernandes, D., F. Sievers, N. Kretzschmar, S. Wu, C. Salomon et F. Chevy. « Sub-Doppler laser cooling of fermionic 40 K atoms in three-dimensional gray optical molasses ». EPL (Europhysics Letters) 100, no 6 (1 décembre 2012) : 63001. http://dx.doi.org/10.1209/0295-5075/100/63001.
Texte intégralShi, Zhenlian, Ziliang Li, Pengjun Wang, Zengming Meng, Lianghui Huang et Jing Zhang. « Sub-Doppler Laser Cooling of 23 Na in Gray Molasses on the D 2 Line ». Chinese Physics Letters 35, no 12 (décembre 2018) : 123701. http://dx.doi.org/10.1088/0256-307x/35/12/123701.
Texte intégralAng'ong'a, Jackson, Chenxi Huang, Jacob P. Covey et Bryce Gadway. « Gray molasses cooling of K39 atoms in optical tweezers ». Physical Review Research 4, no 1 (29 mars 2022). http://dx.doi.org/10.1103/physrevresearch.4.013240.
Texte intégralColzi, Giacomo, Gianmaria Durastante, Eleonora Fava, Simone Serafini, Giacomo Lamporesi et Gabriele Ferrari. « Sub-Doppler cooling of sodium atoms in gray molasses ». Physical Review A 93, no 2 (18 février 2016). http://dx.doi.org/10.1103/physreva.93.023421.
Texte intégralThèses sur le sujet "Gray molasses cooling"
Rio, Fernandes Diogo. « Trapping and cooling of fermionic alkali atoms to quantum degeneracy : Sub-Doppler cooling of Potassium-40 and Lithium-6 in gray molasses ». Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066689.
Texte intégralThis thesis describes the design, construction and characterization of an apparat us capable of trapping and cooling fermionic atoms of 6Li and 40K to ultracold temperatures.The study of mixtures of degenerate Fermi gases opens the door for the creation of new many-body quantum systems.We present a novel laser cooling technique able to simultaneously cool 6Li and 40K to the sub-Doppler regime based on the gray molasses scheme operating on the D1 atomic transition. This strategy enhances the phase space density of both atomic species to 104, the highest value reported in the literature for laser cooled 6Li and 40K. The optimization of a device able to transport a magnetically trapped atomic cloud from the MOT chamber to a science cell is described. In this cell evaporative cooling is performed first in a plugged magnetic quadrupole trap and then in an optical dipoletrap. We report the production of a quantum degenerate Fermi gas of 1.1x106 atoms40K in a crossed dipole trap with T/TF = 0.27, paving the way for the creation of strongly interacting superfluids of 40K
Kretzschmar, Norman. « Experiments with Ultracold Fermi Gases : quantum Degeneracy of Potassium-40 and All-solid-state Laser Sources for Lithium ». Thesis, Paris, Ecole normale supérieure, 2015. http://www.theses.fr/2015ENSU0012/document.
Texte intégralThis thesis presents novel techniques for the experimental study of ultracold quantum gases of fermionic lithium and potassium atoms. In the first part of this thesis, we describe the design and characterization of the new components of our experimental apparatus capable of trapping and cooling simultaneously $^6$Li and $^{40}$K atoms to ultracold temperatures. We report on a novel sub-Doppler cooling mechanism, operating on the D$_1$ line transition of alkali atoms, for laser cooling of lithium and potassium. The measured phase space densities after this molasses phase are on the order of $10^{-4}$ for both $^6$Li and $^{40}$K. We present the forced evaporative cooling of $^{40}$K atoms, starting in an optically plugged magnetic quadrupole trap and continuing in an optical dipole trap. In this context, we report on the production of a quantum degenerate Fermi gas of $1.5\times10^5$ atoms $^{40}$K in a crossed dipole trap with $T/T_{_F} = 0.17$, paving the way for the study of strongly interacting superfluids of $^{40}$K. In the second part of this thesis, we present a narrow-linewidth, all-solid-state laser source, emitting 5.2 W in the vicinity of the lithium D-line transitions at 671 nm. The source is based on a diode-end-pumped unidirectional ring laser operating on the 1342 nm transition of Nd:YVO$_4$, capable of producing 6.5 W of single-mode light delivered in a diffraction-limited beam. We report on three different approaches for second-haromonic generation of its output beam, namely by employing an enhancement cavity containing a ppKTP crystal, intracavity frequency doubling and a ppZnO:LN waveguide structure
Suchet, Daniel Léo. « Simulating the dynamics of harmonically trapped Weyl particles with cold atoms Simultaneous sub-Doppler laser cooling of fermionic 6Li and 40K on the D1 line : Theory and experiment Analog simulation of Weyl particles with cold atoms ». Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066262.
Texte intégralDuring my PhD, I contributed to the design and construction of the Fermix experiment, dedicated to the study of a 6Li-40K fermionic mixture at ultra low temperatures. Our main results are twofold. First, we developed a new sub-Doppler laser cooling scheme, taking advantage of the existence of dark states in the D1 line of alkali atoms. This so-called \emph{grey molasses} allows for a phase space density up to 10⁻⁴, the highest value reported for the simultaneous laser cooling of those two species. The improvement due to this cooling step enabled the production of a quantum degenerate 40K gas in a dipole trap, with 3x10⁵ atoms in two spin states at 62 nK, corresponding to 17% of the Fermi temperature. Second, introducing a canonical mapping, we showed that non-interacting ultra-relativistic particles (Weyl fermions) in a harmonic trap can be simulated by cold fermions confined in a quadrupole potential. We study experimentally, numerically and theoretically the relaxation of these systems towards a steady state which can not be described by a Boltzman distribution, but rather presents strongly anisotropic effective temperatures. This analogy also allows us to translate fundamental properties of relativistic particles in the language of cold atoms. In particular, we demonstrate that the Klein paradox is equivalent to Majorana losses. Finally, we present a theoretical study of the long range interactions between particles confined in two 2D layers immersed in a 3D atomic cloud
Ferrier-Barbut, Igor. « Mixtures of Bose and Fermi Superfluids ». Thesis, Paris, Ecole normale supérieure, 2014. http://www.theses.fr/2014ENSU0012/document.
Texte intégralManifestations of Quantum Physics at the thermodynamical level are found in a broadrange of physical systems. A famous example is superfluidity, discovered at the beginningof the 20th century and found in many different situations, from liquid helium to neutronstars. Dilute ultracold gases offer a unique versatility to engineer quantum many-bodysystems, which can be directly compared with theory thanks to the controllability of theirenvironment. In this thesis we present several experimental investigations led on ultracoldlithium gases. Lithium provides the possibility to study ensembles of bosons andfermions, with controllable interactions between the constituents. We present experimentaltechniques for preparation and studies of degenerate gases of lithium, with prospects forimprovement of the existing methods. We first report on an investigation of three-bodyrecombination of bosons under a resonant two-body interaction. This study, quantitativelycompared with theory constitutes a benchmark for further studies of the unitary Bose gas.Finally, we present the first experimental realization of a mixture of a Bose superfluid witha Fermi superfluid. We demon- strate that both components are in the superfluid regime,and that the counter-flow motion between them possesses the characteristics of superfluidflow, with the absence of viscosity below a critical velocity, and an onset of friction above.Using collective oscillations of the mixture, we measure the coupling between the twosuperfluids in close agreement with a theoretical model
Actes de conférences sur le sujet "Gray molasses cooling"
Boiron, B., A. Michaud, P. Lemonde, Y. Costin, C. Solomon, S. Weyers, K. Szymaniec, L. Cognet et A. Clairon. « Laser Cooling of Cesiuml Atoms in Gray Optical Molasses Down to 1.1pK ». Dans EQEC'96. 1996 European Quantum Electronic Conference. IEEE, 1996. http://dx.doi.org/10.1109/eqec.1996.561817.
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