Tesis sobre el tema "Laser cooling and trapping"
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Cooper, Catherine J. "Laser cooling and trapping of atoms". Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308685.
Texto completoTownsend, Christopher G. "Laser cooling and trapping of atoms". Thesis, University of Oxford, 1995. http://ora.ox.ac.uk/objects/uuid:6a3d235b-22da-412b-b34b-e064322336d5.
Texto completoLoftus, Thomas Howard. "Laser cooling and trapping of atomic Ytterbium /". view abstract or download file of text, 2001. http://wwwlib.umi.com/cr/uoregon/fullcit?p3018379.
Texto completoTypescript. Includes vita and abstract. Includes bibliographical references (leaves 263-280). Also available for download via the World Wide Web; free to University of Oregon users.
Kemp, Stefan Liam. "Laser cooling and optical trapping of Ytterbium". Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12166/.
Texto completoCampbell, Corey Justin. "Trapping, laser cooling, and spectroscopy of Thorium IV". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/48973.
Texto completoNorris, Ian. "Laser cooling and trapping of neutral calcium atoms". Thesis, University of Strathclyde, 2009. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=11540.
Texto completoMaruyama, Reina. "Optical trapping of ytterbium atoms /". Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/9778.
Texto completoCatala, Juan Carlos. "Laser cooling and trapping of argon metastable atomic beam". FIU Digital Commons, 1998. http://digitalcommons.fiu.edu/etd/2083.
Texto completoShivitz, Robert William. "Techniques in laser cooling and trapping of atomic Ytterbium /". view abstract or download file of text, 2003. http://wwwlib.umi.com/cr/uoregon/fullcit?p3095274.
Texto completoTypescript. Includes vita and abstract. Includes bibliographical references (leaves 235-246). Also available for download via the World Wide Web; free to University of Oregon users.
Guardado-Sanchez, Elmer. "A laser system for trapping and cooling of ⁶Li atoms". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100336.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 59-60).
In this thesis, I designed and built a laser system for the trapping and cooling of ⁶Li atoms. The thesis starts explaining a theoretical background of the necessary laser frequencies for the realization of a Zeeman Slower and a 3D MOT. Next it describes the design of the laser system that makes use of a Raman Fiber Amplifier coupled with a Frequency Doubling Cavity and shows the finalized setup. Finally, the thesis delves into the topic of Modulation Transfer Spectroscopy which was used to lock the laser to the D₂ line transition of ⁶Li and shows the spectroscopy setup built for the laser system.
by Elmer Guardado-Sanchez.
S.B.
Ashmore, Jonathan P. y n/a. "Laser Cooling and Trapping of Metastable Neon and Applications to Photoionization". Griffith University. School of Science, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060202.153538.
Texto completoKoo, Jenn Liam Kingston. "Laser cooling and trapping Ca⺠ions in a Penning trap". Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408719.
Texto completoRigby, Charles Ian. "Development of a laser cooling and magneto-optical trapping experiment for Rubidium 87 atoms". Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6492.
Texto completoENGLISH ABSTRACT: A magneto optical trap (MOT) is capable of trapping a vapor cloud consisting of atoms cooled down to the micro Kelvin range. Three orthogonal pairs of counter-propagating laser beams of the correct circular polarisation form an optical molasses which facilitates the cooling of neutral atoms. Additionally a spatially non-uniform magnetic field produced by two current carrying coils in a Maxwell gradient configuration is used to trap the cooled atoms. In this report the effects of the trap parameters, including the laser beam intensity and frequency detuning, beam diameter and magnetic field gradient, on the number of trapped atoms are discussed. Secondly the development of an experimental setup for laser cooling and trapping of 87Rb atoms in vacuum with the aid of a MOT is presented. All trap components were implemented and characterised. The vacuum system and trapping chamber in which the cooling takes place were designed and constructed. A rubidium getter to act as a source of atoms was integrated into the vacuum system. The two external cavity diode lasers used for trapping and optical re-pumping were characterised. The optical setup required for the optical molasses was designed, constructed and characterised. Saturated absorption spectroscopy was performed to investigate the hyperfine structure of 87Rb and to frequency lock the lasers. We report on the current status of the project with regards to progress, results and future work.
AFRIKAANSE OPSOMMING: 'n Magneto-optiese val (magneto optical trap, MOT) kan 'n dampwolk van atome vang en afkoel tot in die mikro Kelvin bereik. Drie ortogonale pare laserbundels, elke paar voortplantend in teenoorgestelde rigtings, met die korrekte sirkelvormige polarisasie vorm 'n sogenaamde optiese molasse wat die afkoeling van neutrale atome moontlik maak. Bykomend word 'n ruimtelik nie-uniforme magneetveld geproduseer deur twee stroomdraende spoele in 'n Maxwell gradient-opstelling gebruik om die afgekoelde atome te vang. In hierdie verslag word die invloed van die val parameters, insluitend die laserbundel intensiteit en frekwensie afstemming, die laserbundel deursnit en magneetveld gradiënt, op die aantal atome in die val bespreek. Tweedens word die ontwikkeling van 'n eksperimentele opstelling vir laser afkoeling en vang van 87Rb atome in vakuum met die hulp van 'n MOT voorgelê. Alle komponente van die val is geïmplementeer en gekarakteriseer. Die vakuumsisteem en val-kamer waarin die afkoeling plaasvind is ontwerp en gebou. 'n Rubidium gasbinder is in die vakuumsisteem ingebou om as 'n bron van atome te dien. Die twee eksterne resonator diodelasers wat gebruik is vir die val en die optiese terugpomp is gekarakteriseer. Die optiese opstelling wat nodig is vir die optiese molasse is ontwerp, gebou en gekarakteriseer. Versadigde absorpsiespektroskopie is uitgevoer om die hiperfynstruktuur van 87Rb te ondersoek en om die lasers se frekwensies te stabiliseer. Verslag word gedoen oor die huidige stand van die projek wat betref vordering, resultate en toekomstige werk.
Stites, Ronald William. "An Experimental Investigation of Radiation Trapping in Optical Molasses". Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1122924988.
Texto completoKangara, Jayampathi. "Design and construction of tapered amplifier systems for laser cooling and atom trapping experiments". Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1344007693.
Texto completoZhong, Shan. "AN IMPROVED LASER COOLING AND ATOM TRAPPING SETUP FOR OPTICAL LATTICE AND RATCHET EXPERIMENTS". Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1438900984.
Texto completoCook, Eryn. "Laser Cooling and Trapping of Neutral Strontium for Spectroscopic Measurements of Casimir-Polder Potentials". Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23192.
Texto completoCerchiari, Giovanni [Verfasser] y Alban [Akademischer Betreuer] Kellerbauer. "Laser spectroscopy of La- and anion trapping with a view to laser cooling / Giovanni Cerchiari ; Betreuer: Alban Kellerbauer". Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177385732/34.
Texto completoBotha, G. N. "Development of an external cavity diode laser for application to spectroscopy and laser cooling and trapping of rubidium". Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2307.
Texto completoIn the presented study a diode laser was characterised and used for spec- troscopy, measuring the resonance lines of atomic rubidium. The characteristics of diode lasers and external cavity diode lasers (ECDL) for the purposes of ab- sorption spectroscopy were investigated and an experimental setup for tunable diode laser spectroscopy using an ECDL was developed. In external cavity diode lasers, the advantages of low cost, small size and e ciency of a diode laser is combined with tunability and a narrow frequency bandwidth. The ECDL was applied in experimental setups for absorption spectroscopy and saturated ab- sorption spectroscopy. Measurement of the absorption of atomic rubidium's D2 line near 780 nm is discussed. The Doppler broadened, as well as the Doppler free spectrum of the ne and hyper ne structure of the D2 line were measured and is discussed. Finer control of the ECDL's stability and frequency, using a servo circuit, were investigated and tested. An overview is given of laser cool- ing and trapping of neutral rubidium atoms, which is the main application the ECDL were developed for.
Victory, Opeolu. "Analysis and characterisation of a closed-loop control system for laser cooling and trapping experiment". Thesis, Cape Peninsula University of Technology, 2020. http://hdl.handle.net/20.500.11838/3065.
Texto completoThis research is aimed at analysing the performance of a closed-loop feedback system of an external cavity diode laser (ECDL) for a laser (Doppler) cooling and atom trapping experiment. External cavity diode lasers (ECDL) are commonly used in laser cooling exper-iments involving rubidium atoms. The laser frequency is controlled by adjusting the cavity length and the diode current. Using feedback control method, the laser is locked to an appropriate rubidium transition using a saturation absorption spectroscopy (SAS) setup together with a proportional-integral-derivative (PID) controller. At the CPUT Quantum Physics research group, we have a laser cooling and atom trapping experimental setup. This setup is a combination of multiple optical, electrical and mechanical components. We first analyse this system experimentally using test signals. By passing in basic test input signals, we were able to measure the system by identifying and extracting certain properties such as the resonant frequency, the damping constant and transient response of the system. The re-sults generated from the experimental analysis further enabled us to estimate the transfer function of the external cavity diode laser (ECDL). We then analyse the feedback setup numerically using known parameters from the experiment, and estimated parameters from the experimental analysis. We do this by first getting the mathematical model of the laser and then solving the differential equation using Euler methods in Matlab. By numerically analysing this feedback system, we are able to understand its transient behaviour. We were also able to test the system for different test scenarios e.g. tests for various controller constants, system response to different disturbance types and so on. The similarities observed between the experimental and numerical analysis pro-vide a reliable framework for future improvements when developing the feedback system. Elements such as the integrator constants, disturbance magnitudes and so on can be evaluated using the developed numerical closed-loop system.
Hoendervanger, Lynn. "A New Metastable Helium Machine : An Investigation into the Attributes of Trapping, Cooling and Detecting Metastable Helium". Thesis, Palaiseau, Institut d'optique théorique et appliquée, 2014. http://www.theses.fr/2014IOTA0006/document.
Texto completoThis thesis describes the work done over the past three and a half years on the new metastable helium experiment at the Institut d'Optique in Palaiseau. In the first chapter it describes a study to improve both the efficiency and the accuracy of the Microchannel Plate (MCP) detection system. We have experimented with adding a gold layer on the top of the input plate, something that we have found increases the efficiency but also decreases the accuracy. The addition of a voltage between the two stacked plates has been shown to both raise the efficiency and improve the accuracy in non-coated MCPs.The second chapter is devoted to the construction of the experimental apparatus. Here the excitation of ground state helium to its metastable state is described, as well as the subsequent collimation and cooling by Zeeman slower of the resulting hot atomic beam. The slowed beam is then captured in a Magneto-Optical Trap, in which we have captured 8x108 atoms.In the third chapter an original study on three-dimensional Doppler cooling in a red-detuned molasses and in the Magneto-Optical trap is presented. The metastable helium system is unique as there is no multiple scattering of photons and there are no sub-Doppler effects. This allows for a never before seen experimental realisation of pure Doppler cooling theory. The fourth chapter describes a study on collisions in a magneto-optical trap of metastable helium. Light-induced Penning collisions are responsible for high trap losses at high intensities and at frequencies close to the transition frequency. We measure the constant rate coefficient to Ksp = 2.8 ± 0.4 x 10-7cm3/s
Anđelković, Zoran [Verfasser]. "Setup of a Penning trap for precision laser spectroscopy at HITRAP : trapping, cooling and electronic detection of externally produced ions / Zoran Andelkovic". Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1023187825/34.
Texto completoKalita, Mukut R. "Search for a Permanent Electric Dipole Moment of 225Ra". UKnowledge, 2015. http://uknowledge.uky.edu/physastron_etds/34.
Texto completoSteer, Edward. "Development and characterisation of a cold molecule source and ion trap for studying cold ion-molecule chemistry". Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:13c3a622-ba78-4a53-902c-666ec461f708.
Texto completoMuniz, Sérgio Ricardo. "Estudo de Blindagem Óptica em Colisões Frias". Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-06052005-162937/.
Texto completoIn this work, we showed that is possible to suppress most of the inelastic processes that may cause losses of atoms in a magneto-optical trap. Our results reveal that the process of optical shielding (demonstrated by our group, for the first time to photoassociative ionization - Phys. Rev. Lett. 73, 1911 (1994)) is much more general than it was supposed. Even allowing the suppression of ground state collisions and probably any other inelastic process that happens at short internuclear distances. To achieve those results, it was necessary to develop a new trapping technique, which allows the study of cold collisions, even in traps whose confinement potential is small. Thanks to that technique it was possible, for the first time, to observe losses caused by hyperfine changing collisions, in a trap of sodium atoms operating in the D1 line (loaded from a vapor cell). That technique has still allowed us to measure the rate of cold collisions () for the D1 line trap, a result which, until now, did not exist in the literature. To verify the reliability of the results obtained by that technique, we also accomplished measures of in the D2 line and compared those results with other existent ones in the literature (obtained by a different technique). The good agreement among those results, made us confident in saying that this technique, besides being very interesting in the study of shallow traps (due to the intensity of the trapping lasers, or due to the own nature of the trap), it is also quite reliable.
Tuboy, Aparecida Marika. "Preparação de laser de diodo e sua utilização em aprisionamento e estudo de átomos frios". Universidade de São Paulo, 1996. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-17042009-125921/.
Texto completoThis thesis describes the development of a complete experimental setup for trapping cesium by a magneto-optical trap (MOT). In this work we have employed diode lasers as light sources and built the entire system for their operation, stabilization and linewidth reduction. We have measured the MOT spring and damping constants as functions of the characteristic parameters of the cesium and sodium traps. We have also carried out two other experiments on trapped sodium atoms operating in the simultaneous presence of the D1 and D2 line frequencies. The first experiment has established the collision rate of trapped atoms in the D1 line MOT and the second has allowed us to observe a new structure operating in this two-frequency regime.
Kamsap, Marius Romuald. "Horloge micro-onde à ions : analyse et transport d'un nuage d'ions dans un piège à plusieurs zones". Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4781/document.
Texto completoThis thesis is part of a project aiming to explore the performance limiting factors of a microwave ion clock. This work is based on the observation and manipulation of a large ion cloud in potentials with different geometries. The purpose is to analyze and transport a large cloud of more than 10^6 ions in a linear radio-frequency trap with several zones. Our group has build a three-zone trap for calcium ion trapping: two quadrupole parts and an octupole part mounted inline. Ions are created in the first quadrupole part and cooled by lasers along the trap symmetry axis. We study the creation of a large ion cloud. The current trapping and cooling parameters limit the maximum size of the cloud to 1,2.10^5 ions. with a rapid and optimized transport protocol, these ions are transfered in the second part of the trap and then in the octupole trap with an efficiency of up to 100%. The result as function of the transport duration shows an asymmetry between the two transport directions. We exploit this feature to add ions in the second or third trap without loss of the already trapped ions. This accumulation technique has allowed to trap 2,5.10^5 ions in the second and third trap. The cooling laser power seems to be the major limiting factor of this number. Finally the observation of the ions in the octupole shows that the cold ions are localised in three different potential wells. This is in contradiction with the hollow structure predicted by the analytical fluid model and molecular dynamics simulations. The cause of this difference is a tiny defect in the octupole symmetry of the RF-electrodes which leads to local minima in the multipole potential
Gingell, Alexander David. "Applications of Coulomb crystals in cold chemistry". Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:3b93832d-b9eb-49e1-b4a4-1bb43d7c9c00.
Texto completoOldham, James Martin. "Combination of a cold ion and cold molecular source". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:ef33adcb-609a-4329-b4d8-aca8a1c48661.
Texto completoMartin, Jocelyn L. "Magnetic trapping and cooling in caesium". Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361996.
Texto completoJoffe, Michael Arnold. "Trapping and cooling atoms at high densities". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12229.
Texto completoChen, Ruiping. "Laser cooling of atoms for ultracold cooling". Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479242.
Texto completoVan, Dongen Janelle. "Simultaneous cooling and trapping of 6Li and 85/87Rb". Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/351.
Texto completoHillenbrand, Gerd. "Laser cooling of atoms". Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259952.
Texto completoSteane, A. M. "Laser cooling of atoms". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315817.
Texto completoRayner, Anton. "Laser cooling of solids /". St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16448.pdf.
Texto completoZhelyazkova, Valentina. "Laser cooling of CaF molecules". Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/24740.
Texto completoMatsushima, Aki. "Transverse laser cooling of SrF". Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/17839.
Texto completoCerrillo, Moreno Javier. "Laser cooling of quantum systems". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/12788.
Texto completoRupper, Greg. "Theory of Semiconductor Laser Cooling". Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194520.
Texto completoKahra, Steffen. "Trapping and cooling of single molecular ions for time resolved experiments". Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-128803.
Texto completoStoll, Michael. "Buffer gas cooling and magnetic trapping of CrH and MnH molecules". Berlin mbv, 2008. http://d-nb.info/992996392/04.
Texto completoClark, Joanne Louise. "Laser cooling in the condensed phase". Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266518.
Texto completoRyjkov, Vladimir Leonidovich. "Laser cooling and sympathetic cooling in a linear quadrupole rf trap". Texas A&M University, 2003. http://hdl.handle.net/1969.1/1637.
Texto completoGanic, Djenan y dga@rovsing dk. "Far-field and near-field optical trapping". Swinburne University of Technology. Centre for Micro-Photonics, 2005. http://adt.lib.swin.edu.au./public/adt-VSWT20051130.135436.
Texto completoGanic, Djenan. "Far-field and near-field optical trapping". Australasian Digital Thesis Program, 2005. http://adt.lib.swin.edu.au/public/adt-VSWT20051130.135436.
Texto completoA thesis submitted for the degree of Doctor of Philosophy, Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, 2005. Typescript. Includes bibliographical references (p. 164-177). Also available on cd-rom.
Raymond, Ooi Chong Heng. "Quantum optics of laser cooling of molecules". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968928978.
Texto completoHolland, Darren. "Progress towards laser cooling of BH molecules". Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45433.
Texto completoSchnitzler, Harald. "Development of an experiment for trapping, cooling, and spectroscopy of molecular hydrogen ions". [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9424100.
Texto completoLevonian, David (David S. ). "A Cavity-stabilized diode laser for dipole trapping of ytterbium". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/105998.
Texto completoThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 99-103).
Bad-cavity lasers using a gain medium with a narrower linewidth than the laser cavity have the potential to achieve very narrow linewidths and extremely long coherence times. Such lasers could serve as active frequency standards or enable very-long-baseline interferometric telescopes at optical frequencies. The 6s6p³P₀ to 6s²¹S₀ ground state transition in ¹⁷¹Yb is a promising candidate for the gain medium of a bad-cavity laser due to its 44 mHz linewidth. For ytterbium to be used efficiently as a gain medium, its inhomogeneous broadening must be suppressed to a level lower than the linewidth of its gain transition. In this thesis, I design, implement, and characterize an optical lattice trap for ytterbium atoms. The trap consists of a diode laser which is frequency stabilized to an adjustable-length cavity where the ytterbium atoms are trapped. The length of this cavity is then locked by comparison of the laser frequency to a stable reference cavity. The resulting standing wave has high enough intensity that the recoil energy of the gain transition is smaller than the energy spacing between motional modes of the trapped atoms. This situation is known as the Lamb-Dicke regime and means that there is an absence of recoil broadening. The large spacing between motional modes of the trap also enables sideband resolved cooling of the atoms, which allows cooling to temperatures of 3 [mu]K, near the ground state of the trapping potential. Additionally, if the wavelength of the optical lattice is chosen to be at the magic wavelength for ytterbium, where the relative AC Stark shift for the two levels of the gain transition is zero to first order, there is no broadening due to varying intensity in the trap. Since the Doppler effect, recoil broadening and the AC Stark shift are the main sources of inhomogeneous broadening, this trapping scheme is expected to suppress inhomogeneous broadening to a level of 1 Hz.
by David Levonian.
M. Eng.