Bibliographies thématiques / Blue- detuned optical lattices

Littérature scientifique sur le sujet « Blue- detuned optical lattices »

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Publié le 10 mars 2023

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Articles de revues sur le sujet "Blue- detuned optical lattices"

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Guo, J., et J. Cooper. « Probe-transmission spectrum of a blue-detuned optical lattice ». Physical Review A 52, no 3 (1 septembre 1995) : R1819—R1822. http://dx.doi.org/10.1103/physreva.52.r1819.

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Krasnov, I. V. « Ultracold plasma in blue-detuned optical molasses ». Physics Letters A 372, no 17 (avril 2008) : 3118–23. http://dx.doi.org/10.1016/j.physleta.2008.01.021.

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Winoto, S., Marshall DePue, Nathan Bramall et David Weiss. « Laser cooling at high density in deep far-detuned optical lattices ». Physical Review A 59, no 1 (janvier 1999) : R19—R22. http://dx.doi.org/10.1103/physreva.59.r19.

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Zhang, Li-Wei, Xian-Li Li et Liu Yang. « Optical nonreciprocity with blue-detuned driving in two-cavity optomechanics ». Acta Physica Sinica 68, no 17 (2019) : 170701. http://dx.doi.org/10.7498/aps.68.20190205.

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Chen, Zhao, Fan Zhang, Qi Zhang, Juanjuan Ren, He Hao, Xueke Duan, Pengfei Zhang, Tiancai Zhang, Ying Gu et Qihuang Gong. « Blue-detuned optical atom trapping in a compact plasmonic structure ». Photonics Research 5, no 5 (21 août 2017) : 436. http://dx.doi.org/10.1364/prj.5.000436.

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Piest, B., V. Vollenkemper, J. Böhm, A. Herbst et E. M. Rasel. « Red- and blue-detuned magneto-optical trapping with liquid crystal variable retarders ». Review of Scientific Instruments 93, no 2 (1 février 2022) : 023202. http://dx.doi.org/10.1063/5.0071619.

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Xu, Peng, Xiaodong He, Jin Wang et Mingsheng Zhan. « Trapping a single atom in a blue detuned optical bottle beam trap ». Optics Letters 35, no 13 (21 juin 2010) : 2164. http://dx.doi.org/10.1364/ol.35.002164.

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Ozeri, Roee, Lev Khaykovich et Nir Davidson. « Long spin relaxation times in a single-beam blue-detuned optical trap ». Physical Review A 59, no 3 (1 mars 1999) : R1750—R1753. http://dx.doi.org/10.1103/physreva.59.r1750.

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Pechkis, Joseph A., et Fredrik K. Fatemi. « Cold atom guidance in a capillary using blue-detuned, hollow optical modes ». Optics Express 20, no 12 (31 mai 2012) : 13409. http://dx.doi.org/10.1364/oe.20.013409.

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Turpin, A., J. Polo, Yu V. Loiko, J. Küber, F. Schmaltz, T. K. Kalkandjiev, V. Ahufinger, G. Birkl et J. Mompart. « Blue-detuned optical ring trap for Bose-Einstein condensates based on conical refraction ». Optics Express 23, no 2 (23 janvier 2015) : 1638. http://dx.doi.org/10.1364/oe.23.001638.

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Thèses sur le sujet "Blue- detuned optical lattices"

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Jarvis, Kyle. « The blue-detuned magneto-optical trap ». Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/63833.

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It has been more than 30 years since the first demonstration of a magneto-optical trap (MOT) using sodium atoms. Since then the MOT has revolutionised the field of atomic physics by facilitating the emergence of a broad range of productive avenues of research using atoms prepared at low temperatures and high densities. This thesis describes the development of a novel kind of magneto-optical trap: the blue-detuned MOT. Unlike in all previous MOTs the light is blue detuned from atomic resonances and drives "type-II" transitions that have dark ground-state sub-levels. A discussion of the position-dependent and velocity-dependent forces experienced by an atom or molecule in a MOT is first used to consolidate recent theoretical work and, in particular, to introduce the concept of a blue-detuned MOT. The design and construction of an experiment that has been built to demonstrate a blue-detuned MOT using ⁸⁷Rb is described. A thorough characterisation of this novel MOT has been performed. At high magnetic field gradients, radiation-pressure-limited densities exceeding 10¹¹ cm⁻³ have been reached whilst temperatures are cooled below 30μK by the efficient and robust sub-Doppler cooling mechanisms. The maximum phase-space density measured is 6 x 10⁻⁶, which is higher than in most normal atomic MOTs, comparable to the best dark SPOTs, and a million times higher than that reported for red-detuned type-II MOTs. This makes the blue-detuned MOT particularly attractive for molecules where laser cooling and trapping always uses type-II transitions. For the first time, a study of trap loss due to ultra-cold collisions between atoms occurring in the presence of near-resonant blue-detuned light is undertaken. Finally, the experiment is used to demonstrate many new and unreported configurations of MOT for ⁸⁷Rb, showing that a comprehensive understanding of complicated MOTs is now possible, and presenting a clear direction for further research.
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Jones, Philip H. « Ultra-cold atoms in far-detuned optical lattices ». Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393245.

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ROSI, SARA. « Interacting Bosons in optical lattices : optimal control ground state production, entanglement characterization and 1D systems ». Doctoral thesis, 2015. http://hdl.handle.net/2158/1004929.

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The work presented in this thesis concerns the study of quantum many-body physics by making use Bose-Einstein condensates loaded in optical lattices potentials. The first part describes the development of a new experimental strategy for the production of the degenerate atomic sample, the second part concerns the optimal control ground state production and the entanglement characterization on a systems of interacting Bosons across the superfluid - Mott insulator quantum phase transition, and the third part illustrates the study of the dynamical properties of an array of 1D gases performed via Bragg spectroscopy.
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Actes de conférences sur le sujet "Blue- detuned optical lattices"

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Zhang, Shengnan, Balsant Tiwari, Sandhya Ganesh, Preetam Ramchurn, Kai Bongs et Yeshpal Singh. « Blue-detuned Optical Lattice for Sr Long-range Interactions ». Dans 2022 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS). IEEE, 2022. http://dx.doi.org/10.1109/eftf/ifcs54560.2022.9850544.

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Bober, M., A. Tonoyan, A. Gogyan, M. Witkowski, M. Zawada, P. Ablewski, S. Bilicki et al. « Strontium Optical Atomic Clocks in KL FAMO Blue Detuned Lattice for Strontium Atoms and Project of a Continuous Active Optical Clock with Cold Strontium Atoms ». Dans 2019 Joint Conference of the IEEE International Frequency Control Symposium anEuropean Frequency and Time Forum (EFTF/IFC). IEEE, 2019. http://dx.doi.org/10.1109/fcs.2019.8856092.

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Lim, Soon Wei Daniel, Joon-Suh Park, Maryna L. Meretska, Ahmed H. Dorrah, Dmitry Kazakov et Federico Capasso. « Metasurface blue-detuned atom trap arrays using singularity engineering ». Dans CLEO : QELS_Fundamental Science. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.ff4d.4.

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An array of ten identical, blue-detuned atom traps with 3D confinement generated by inverse-designed metasurface is presented, a proof-of-concept for metasurfaces as a compact and versatile means for multi-atom optical traps in quantum optics.
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Kumar, Prem, et B. Matthew poelker. « Frequency correlated laser beam generation in sodium vapor : sodium-density and pump-intensity dependence ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.tus3.

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When sodium vapor is irradiated with a single-frequency dye laser (pump) tuned in the vicinity of either of the Doppler-broadened D lines and enclosed in an optical cavity, Raman shifted oscillation builds up, which is blue shifted for a blue-detuned pump and red shifted for a red-detuned pump by 1.772 GHz (sodium ground-state hyperfine splitting).1 The gain mechanism responsible for this Raman-laser action can be understood by modeling sodium as a three-level atom. The Raman laser frequency is highly correlated with that of the pump as demonstrated earlier by observing a beat frequency bandwidth between the two lasers of as low as 17 kHz.2 (The pump had rms frequency fluctuation of the order of 10 MHz.) For spectroscopic applications, for example, frequency correlated laser beams are commonly generated using acoustooptic techniques which are difficult to implement beyond the gigahertz region. The Raman laser technique is extendable, in principle, even to the millimeter range. Here we present measurements of the sodium-density and pump-intensity dependence of the Raman-laser output and compare the results with those predicted by the three-level-atom model.
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Yu, J., J. Djemaa, P. Nosbaum et P. Pillet. « Transverse magneto-optical compression of a frequency-chirping, slowed cesium atomic beam ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.thdd.18.

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We have transversally compressed a monokinetic cesium atomic beam in a 2D MOT1,2 on the F=4→F′=5 transition of the cesium IX, line. The longitudinal cooling was obtained by frequency-chirped diode lasers.3 Preliminary results have been obtained showing a final diameter of about 50pm and a density of 108at./cm3. We have studied the specificities of a multi-V system as the transition F=4→F′=5 in the cesium atom. Originally proposed for a three-level V-type atomic system4, the process can be easily generalized to F→F+1 (F>=1) transitions. In this case, the atom is assumed to be polarized into the Zeeman sub-level Mf=-F with respect to the local magnetic field inside of the trap. For a non-polarized statistic mixture, two effects modify the compression process. The first one is due to the large variation in the Clebsch-Gordan coefficients.3 The second one comes from the difference between the Larmor frequencies associated to the lower and the upper levels. The both effects lead to a mF-dependent restoring force. Efficient compression can be obtained by preparing the atomic population in the “good” Zeeman sub-levels, |MF|=F. Two methods have been explored in our experiments to polarize the atomic beam. The first one used an additional blue-detuned laser beam to increase the atomic population in the |MF|=f Zeeman sub-levels by optical pumping. In the second one, the σ-polarized cooling laser beam orientated the atomic population in the axial direction during the slowing process. This orientation was adiabatically transformed into transversal ones by entering in the trap. Further experiments are in progress.
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Pritchard, David E. « Atom Optics ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fh1.

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A large-aperture liquid-He coated spherical mirror and a room-temperature bent-gold crystal have been used to focus atom beams of H and He, respectively. They are described elsewhere in this symposium. Many of the new optical elements for atoms rely on the mechanical forces of light; mirrors are one example. When atoms approach the surface of glass that has intense blue-detuned light inside, they recoil from the evanescent wave that extends several wavelengths past the surface and into the vacuum. The atoms are never close enough to the surface to be affected by its atomic attraction or its small-scale irregularities. When a highly collimated beam of sodium atoms is directed at a standing wave of light near its resonance frequency, the angular scattering pattern of the atoms exhibits the characteristics of diffraction from a short sinusoidal grating. Diffraction orders up to ~20 have been observed at high light intensities. In contrast to phase gratings made with light, material absorption gratings are amplitude gratings.
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Maywald, Thomas, Thomas Backhaus, Sven Schrape et Arnold Kühhorn. « Geometric Model Update of Blisks and its Experimental Validation for a Wide Frequency Range ». Dans ASME Turbo Expo 2017 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63446.

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The contribution discusses a model update procedure and its experimental validation in the context of blisk mistuning. Object of investigation is an industrial test blisk of an axial compressor which is milled from solid using a state of the art 5-axis milling machine. First, the blisk geometry is digitized by a blue light fringe projector. Digitization is largely automated using an industrial robot cell in order to guarantee high repeatability of the measurement results. Additionally, frequency mistuning patterns are identified based on vibration measurements. Here, the system excitation is realized by a modal impact hammer. The blade response is detected using a laser scanning vibrometer. Furthermore, all blades except the currently excited one are detuned with additional masses. Applying these masses allows to identify a blade dominated natural frequency for each blade and every mode of interest. Finally, these blade dominated frequencies are summarized to mode specific mistuning patterns. The key part of the contribution presents a model update approach which is focused on small geometric deviations between real engine parts and idealized simulation models. Within this update procedure the nodal coordinates of an initially tuned finite element blisk model were modified in order to match the geometry of the real part measured by blue light fringe projection. All essential pre- and post-processing steps of the mesh morphing procedure are described and illustrated. It could be proven that locally remaining geometric deviations between updated finite element model and the optical measurement results are below 5 μm. For the purpose of validation blade dominated natural frequencies of the updated finite element blisk model are calculated for each sector up to a frequency of 17 kHz. Finally, the numerically predicted mistuning patterns are compared against the experimentally identified counterparts. At this point a very good agreement between experimentally identified and numerically predicted mistuning patterns can be proven across several mode families. Even mistuning patterns of higher modes at about 17 kHz are well predicted by the geometrically mistuned finite element model. Within the last section of the paper, possible uncertainties of the presented model update procedure are analyzed. As a part of the study the digitization of the investigated blisk has been repeated for ten times. These measurement results serve as input for the model update procedure described before. In the context of this investigation ten independent geometrical mistuned simulation models are created and the corresponding mistuning patterns are calculated.
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