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Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics最新文献

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Some theoretical and experimental aspects of three-grating Mach–Zehnder atom interferometers 三光栅马赫-曾德尔原子干涉仪的一些理论和实验问题
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01206-9
R. Delhuille, C. Champenois, M. Büchner, L. Jozefowski, Th. Lahaye, R. Mathevet, A. Miffre, C. Rizzo, C. Robilliard, G. Trénec, J. Vigué
{"title":"Some theoretical and experimental aspects of three-grating Mach–Zehnder atom interferometers","authors":"R. Delhuille,&nbsp;C. Champenois,&nbsp;M. Büchner,&nbsp;L. Jozefowski,&nbsp;Th. Lahaye,&nbsp;R. Mathevet,&nbsp;A. Miffre,&nbsp;C. Rizzo,&nbsp;C. Robilliard,&nbsp;G. Trénec,&nbsp;J. Vigué","doi":"10.1016/S1296-2147(01)01206-9","DOIUrl":"10.1016/S1296-2147(01)01206-9","url":null,"abstract":"<div><p>In this contribution, we present some recent theoretical results concerning the fringe contrast in Mach–Zehnder atom interferometers and the use of Bloch states to describe atomic diffraction. We also describe the observation of diffraction of lithium at thermal energy by a quasi-resonant laser standing wave.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 587-593"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01206-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81067378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Miniaturizing atom optics: from wires to atom chips 原子光学微型化:从导线到原子芯片
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01200-8
Jörg Schmiedmayer, Ron Folman
{"title":"Miniaturizing atom optics: from wires to atom chips","authors":"Jörg Schmiedmayer,&nbsp;Ron Folman","doi":"10.1016/S1296-2147(01)01200-8","DOIUrl":"10.1016/S1296-2147(01)01200-8","url":null,"abstract":"<div><p>A large variety of trapping and guiding potentials can be designed by bringing cold atoms close to charged or current carrying material objects, which allows for miniaturization and integration of atom optical elements. Surfaces holding such structures form <em>Atom Chips</em> which, for coherent matter wave optics, may form the basis for a variety of novel applications and research tools, similar to what integrated circuits are for electronics. We describe the basic principles of constructing such microscopic traps and guides, how to load atoms into them, and give examples of <em>Atom Chip</em> experiments.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 551-563"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01200-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78975839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Hollow fibre guides for metastable helium atoms 亚稳氦原子用中空纤维导向器
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01190-8
R.G. Dall, M.D. Hoogerland, K.G.H. Baldwin, J.S. Buckman
{"title":"Hollow fibre guides for metastable helium atoms","authors":"R.G. Dall,&nbsp;M.D. Hoogerland,&nbsp;K.G.H. Baldwin,&nbsp;J.S. Buckman","doi":"10.1016/S1296-2147(01)01190-8","DOIUrl":"10.1016/S1296-2147(01)01190-8","url":null,"abstract":"<div><p>The realisation of an atomic waveguide will be an important component for the development of future atom optic devices such as large angle atom interferometers. Hollow optical fibres that employ repulsive (blue detuned) evanescent light fields to guide the atoms are one approach to this technology. We report here on multimode guiding of metastable helium (<span><math><mtext>2</mtext><msup><mi></mi><mn>3</mn></msup><mtext>S</mtext><msub><mi></mi><mn>1</mn></msub></math></span>) atoms through hollow optical fibres that support multimode light fields. In order to produce efficient single-mode atom guiding, hollow fibres supporting single light mode propagation will be required to generate uniform evanescent light fields inside fibre wall. We have recently developed such a fibre and report on the suitability of its light transmission characteristics for atom waveguiding.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 595-603"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01190-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85940670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Formation of a Bose condensate of stable molecules via a Feshbach resonance 通过费什巴赫共振形成稳定分子的玻色凝聚
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01205-7
S.J.J.M.F. Kokkelmans, H.M.J. Vissers, B.J. Verhaar
{"title":"Formation of a Bose condensate of stable molecules via a Feshbach resonance","authors":"S.J.J.M.F. Kokkelmans,&nbsp;H.M.J. Vissers,&nbsp;B.J. Verhaar","doi":"10.1016/S1296-2147(01)01205-7","DOIUrl":"10.1016/S1296-2147(01)01205-7","url":null,"abstract":"<div><p>We propose and analyze an approach to convert an atomic condensate into a condensate of diatomic molecules in the rovibrational ground state. The process consists of a stimulated Raman transition dramatically enhanced by a time-dependent magnetic field that sweeps over a field-induced Feshbach resonance. For a condensate of Na atoms a judicious choice of Feshbach resonance enhances the Raman transition probability by seven orders of magnitude. A conversion efficiency of 3% can be realized by a field varying over a resonance at <span><math><mtext>B=853</mtext></math></span> G in the direction of increasing field strength. With the opposite direction an efficiency of 23% is realized.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 641-647"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01205-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90402862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 43
Micron-scale magnetic structures for atom optics 用于原子光学的微米级磁性结构
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01194-5
A.I. Sidorov , R.J. McLean , B.A. Sexton , D.S. Gough , T.J. Davis , A. Akulshin , G.I. Opat , P. Hannaford
{"title":"Micron-scale magnetic structures for atom optics","authors":"A.I. Sidorov ,&nbsp;R.J. McLean ,&nbsp;B.A. Sexton ,&nbsp;D.S. Gough ,&nbsp;T.J. Davis ,&nbsp;A. Akulshin ,&nbsp;G.I. Opat ,&nbsp;P. Hannaford","doi":"10.1016/S1296-2147(01)01194-5","DOIUrl":"10.1016/S1296-2147(01)01194-5","url":null,"abstract":"<div><p>Magnetic structures with periodicities on the scale of a micron have been constructed by magneto-optical recording on perpendicularly magnetised TbFeCo film with a focussed diode laser beam in the presence of an external field, and by microfabricating perpendicularly magnetised grooved CoCr structures. Strong reflection signals and predominantly specular reflection have been realised for beams of laser-cooled caesium atoms normally incident on both types of structure. Preliminary measurements of the specularity for a grooved <span><math><mtext>a=1</mtext></math></span> μm magnetic structure are particularly encouraging.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 565-571"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01194-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73406781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Laser cooling and trapping of metastable helium: towards Bose–Einstein condensation 亚稳氦的激光冷却和俘获:走向玻色-爱因斯坦凝聚
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01204-5
Wim Vassen
{"title":"Laser cooling and trapping of metastable helium: towards Bose–Einstein condensation","authors":"Wim Vassen","doi":"10.1016/S1296-2147(01)01204-5","DOIUrl":"10.1016/S1296-2147(01)01204-5","url":null,"abstract":"<div><p>Metastable triplet helium is an interesting atom, next to the alkalis and atomic hydrogen, to pursue Bose–Einstein condensation. In this paper an overview of the relevant physics of triplet helium and experimental progress in Amsterdam towards reaching Bose–Einstein condensation is described.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 613-618"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01204-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74084896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Elastic and inelastic evanescent-wave mirrors for cold atoms 冷原子用弹性和非弹性倏逝波镜
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01203-3
D. Voigt, B.T. Wolschrijn, R.A. Cornelussen, R. Jansen, N. Bhattacharya, H.B. van Linden van den Heuvell, R.J.C. Spreeuw
{"title":"Elastic and inelastic evanescent-wave mirrors for cold atoms","authors":"D. Voigt,&nbsp;B.T. Wolschrijn,&nbsp;R.A. Cornelussen,&nbsp;R. Jansen,&nbsp;N. Bhattacharya,&nbsp;H.B. van Linden van den Heuvell,&nbsp;R.J.C. Spreeuw","doi":"10.1016/S1296-2147(01)01203-3","DOIUrl":"10.1016/S1296-2147(01)01203-3","url":null,"abstract":"<div><p>We report on experiments on an evanescent-wave mirror for cold <sup>87</sup>Rb atoms. Measurements of the bouncing fraction show the importance of the Van der Waals attraction to the surface. We have directly observed radiation pressure parallel to the surface, exerted on the atoms by the evanescent-wave mirror. We analyze the radiation pressure by imaging the motion of the atom cloud after the bounce. The number of photon recoils ranges from 2 to 31. This is independent of laser power, inversely proportional to the detuning and proportional to the evanescent-wave decay length. By operating the mirror on an open transition, we have also observed atoms that bounce inelastically due to a spontaneous Raman transition. The observed distributions consist of a dense peak at the minimum velocity and a long tail of faster atoms, showing that the transition is a stochastic process with a strong preference to occur near the turning point of the bounce.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 619-624"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01203-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89801374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Beyond the usual approximations: Time-dependent magnetic traps revisited 超越通常的近似:时间相关的磁阱重新审视
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01188-X
J.H. Müller, O. Morsch, D. Ciampini, M. Anderlini, R. Mannella, E. Arimondo
{"title":"Beyond the usual approximations: Time-dependent magnetic traps revisited","authors":"J.H. Müller,&nbsp;O. Morsch,&nbsp;D. Ciampini,&nbsp;M. Anderlini,&nbsp;R. Mannella,&nbsp;E. Arimondo","doi":"10.1016/S1296-2147(01)01188-X","DOIUrl":"10.1016/S1296-2147(01)01188-X","url":null,"abstract":"<div><p>The motion of atoms in time-orbiting potential (TOP) traps is usually described by applying adiabatic and time-averaging approximations. In this work we show that careful experimental analysis reveals corrections to both of these approximations in the shape of a micromotion of the atoms at the frequency of the time-dependent trapping field and of a dependence of the equilibrium position of the atoms on the sense of rotation of the bias field. Whereas the former can be easily explained theoretically, the latter requires a more sophisticated analytical treatment involving geometric forces. We present experimental results and numerical simulations which agree well with the data. Furthermore, implications for Bose–Einstein condensation experiments are discussed.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 649-656"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01188-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90887264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Nucleation of quantized vortices in a gaseous Bose–Einstein condensate 气态玻色-爱因斯坦凝聚体中量子化漩涡的成核
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01192-1
F. Chevy, K. Madison, V. Bretin, J. Dalibard
{"title":"Nucleation of quantized vortices in a gaseous Bose–Einstein condensate","authors":"F. Chevy,&nbsp;K. Madison,&nbsp;V. Bretin,&nbsp;J. Dalibard","doi":"10.1016/S1296-2147(01)01192-1","DOIUrl":"10.1016/S1296-2147(01)01192-1","url":null,"abstract":"<div><p>Using a focused laser beam we stir a Bose–Einstein condensate confined in a magnetic trap. When the stirring frequency lies near a critical value, compatible with the quadrupolar mode resonance, we observe the nucleation of a vortex even for a very small stirring anisotropy (of the order of 1%). The results presented here demonstrate that the nucleation of vortices in the case of a trapped BEC is driven by the resonant excitation of the rotating quadrupolar mode. Using a percussive excitation of the condensate, we measure the angular momentum of the condensate with the vortex, and we find that it is <span><math><mtext>∼ℏ</mtext></math></span> per particle, as expected. For larger stirring frequencies, regular arrays of vortices are observed.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 663-669"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01192-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79630419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Quantum condensates 量子冷凝物
Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics Pub Date : 2001-06-01 DOI: 10.1016/S1296-2147(01)01198-2
Uffe V. Poulsen, Klaus Mølmer
{"title":"Quantum condensates","authors":"Uffe V. Poulsen,&nbsp;Klaus Mølmer","doi":"10.1016/S1296-2147(01)01198-2","DOIUrl":"https://doi.org/10.1016/S1296-2147(01)01198-2","url":null,"abstract":"<div><p>We analyze the atomic state obtained by photo-dissociation of a molecular condensate. We show that the dissociation process produces an atomic condensate in a squeezed state in analogy with the down-conversion process leading to squeezed light in quantum optics.</p></div>","PeriodicalId":100307,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IV - Physics-Astrophysics","volume":"2 4","pages":"Pages 687-693"},"PeriodicalIF":0.0,"publicationDate":"2001-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1296-2147(01)01198-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136413872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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