Elastic and inelastic evanescent-wave mirrors for cold atoms |
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| Institution: | 1. Scientific and Technology Pole, IRCCS MultiMedica, Milan, Italy;2. Department of Biotechnologies and Life Sciences, University of Insubria, Varese, Italy;1. Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China;2. Department of Chemistry, University of Hull, Hull HU6 7RX, U.K;1. Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Kadapa 516003, Andhra Pradesh, India;2. Functional Materials Division, Central Electrochemical Research Institute (CSIR-CECRI), Karaikudi 630 003, Tamil Nadu, India;1. Department of Occupational and Environmental Health, School of Public Health, Dalian Medical University, No. 9 W. Lvshun South Road, Dalian 116044, China;2. Department of Nutrition and Food Hygiene, School of Public Health, Dalian Medical University, No. 9 W. Lvshun South Road, Dalian 116044, China;3. Department of Nutrition, Second Hospital, Dalian Medical University, Dalian 116023, China;4. State Key Laboratory of Natural Products and Functions, Institute of Materia Medica, Chinese Academy of Medical Sciences ＆ Peking Union Medical College, Beijing 100050, China;5. Laboratory of Neurobiology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA;1. Reactor Research School, Nuclear Science and Technology Research Institute of Iran, Tehran, Iran;2. Department of Physics, University of Guilan, Rasht, Iran;3. Department of Physics, Shahrood University of Technology, Shahrood, Iran;4. Faculty of Medicine, Department of Medical Physics, Tabriz University of Medical Sciences, Tabriz, Iran;5. Department of Physics, K. N. Toosi University of Technology, Tehran, Iran;1. State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Technology, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China;2. Glyn O. Phillips Hydrocolloid Research Centre at HUT, Hubei University of Technology, Wuhan, 430068, China;3. State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China |
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| Abstract: | We report on experiments on an evanescent-wave mirror for cold 87Rb 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. |
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