Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"dipole trap"”.
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Experiments Towards the Realization of a Nanofiber Guided Dipole Trap
… that enables optical fields to interface with trapped neutral atoms in their vicinity. In such a configuration, the guided light exhibits a large portion of evanescent field into the vacuum thus laser cooled atoms can couple to the fiber mode. By trapping and cooling atoms around the nanofiber …
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Two-Photon Ionization of the Calcium 4S3D 1D2 Level in an Optical Dipole Trap
This thesis reports an optical dipole trap for atomic calcium. The dipole trap is loaded from a magneto-optical trap (MOT) of calcium atoms cooled near the Doppler limit (~1 mK). The dipole trap is formed by a large-frame argon ion laser focused to 20 microns into the center of the MOT. This laser …
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Progress towards strong coupling between collisionally blockaded atoms and an optical cavity
… of a high finesse cavity overlapped with a 2pm dipole trap. The use of a relatively long (14mm) cavity grants good optical access, permitting the implementation of a dipole trap centered on the cavity, and small enough to capture only a single atom in the collisional blockade regime.
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Trapping cold rubidium in a fiber
… of loading cold ⁸⁷Rb into a red-detuned optical dipole trap within a hollow core photonic fiber. This confines the atoms to 6 microns in two dimensions. We initially cooled the Rubidium in a magneto-optical trap. The great confinement of the Rubidium allows for increased optical depths per atom …
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Experiments with Bose-Einstein condensates in a double-well potential
Trapped atom interferometry was demonstrated with Bose-Einstein condensates in an optical double-well trap. Coherent splitting of trapped condensates was performed by deforming an optical single-well potential into a double-well potential, and the relative phase of the two split condensates was …
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Development Of A Cold Atoms Platform For A DQC1 Implementation
… 5 μm (for Rydberg states of atoms n = 43). A dipole trap system was designed and implemented during the course of this PhD with the aim of satisfying these experimental constraints. In our setup, a vapour of 87Rb is first trapped in a Magneto-Optical Trap (MOT) and cooled to sub-Doppler …
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Loading rubidium atoms into a hollow core fiber
We demonstrate a procedure for cooling, trapping, and transferring rubidium atoms into a hollow core photonic band gap fiber. The atoms are first collected in a magneto-optical trap (MOT) and then cooled using polarization gradient cooling. Magnetic traps are then used to confine and transfer the …
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Experimental studies of evaporative cooling and Bose Einstein condensation in an optical trap
… loading phase of 60 ms about 1% of the atoms are trapped in a tight CO2 Laser focus region. Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically having 20000 atoms. In this thesis detailed characterization of the system and its …
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Optical imaging of Rydberg atoms
… at the single photon level. ⁸⁷Rb atoms are trapped and cooled using a magneto-optical trap (MOT) and a far off resonance dipole trap (FORT). Once the system is prepared, a ladder EIT scheme with Rydberg atoms is used to map the photon field onto the ensemble. The powerful dipole interaction …
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Trapping and Laser Cooling an Ensemble of Ytterbium-171 Atoms for use in an Atomic Clock
… ensemble of ytterbium-171 atoms in a 2D optical dipole trap created by an optical cavity. Our loading method ensures that all atoms are located in the intersection of 2 perpendicular dipole traps as verified through absorption imaging. Raman sideband cooling was used to cool the atomic ensemble …
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Emergence of Collective Light Scattering in Atomic <sup>87</sup>Rb Samples
… of 87Rb. Initially prepared in a magneto-optical trap, the atoms are loaded into a far-off-resonance optical dipole trap (FORT) in which the ensemble has a temperature near 100 mK and initial Gaussian radii of approximately 3 mm and 280 mm in the transverse and longitudinal directions, …
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Observation of nonlinear tunneling of a Bose-Einstein condensate in a single Josephson junction
… lattice with a focused laser beam optical dipole trap. The tunneling dynamics between the two potential wells exhibits two distinct dynamical regimes. For small initial population imbalances of the two wells we observe nearly sinusoidal Josephson tunneling oscillations, which are …
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Fast, Nondestructive Quantum-state Readout of a Single, Trapped, Neutral Atom
<p>Experimental systems that trap single, neutral atoms have recently emerged as a promising platform for experiments in a range of disciplines such as quantum information science, quantum simulation and fundamental light-atom interaction. In this thesis, I build such a system and use it to trap …
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Double-Loop Microtrap Array for Ultracold Atoms
A novel kind of magnetic microtrap is demonstrated for ultracold neutral atoms. It consists of two concentric loops of radii $r_1$ and $r_2$ having oppositely oriented currents. A magnetic field minimum is generated in three dimensions that can be used to trap the atoms with a trap depth of about 1 …
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Experimental Platform for a Box-Trapped Dipolar Quantum Gas
… a multitude of quantum phenomena that stem from dipole-dipole interactions, particularly their long-range and anisotropic nature. Consequentially, dipolar quantum gases make up an increasingly popular branch within an already thriving field of ultracold quantum gases. The thesis details the …
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Construction of a quantum gas microscope for fermionic atoms
… resolution. We set up separate 3D magnetooptical traps for capturing and cooling both ²³Na and ⁴⁰K. These species are then trapped simultaneously in a plugged quadrupole magnetic trap and evaporated to degeneracy; we obtain a sodium Bose-Einstein condensate with about a million atoms and a …
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Manipulation and control of ultra-cold rubidium atoms
… to confine neutral atoms in microscopic dipole traps and to manipulate their internal states by laser excitation to Rydberg states. A lot of effort was devoted to the stabilization of the laser sources for two-photon excitation to the Rydberg states, using techniques based on modulation …
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Bose-Fermi mixtures of ultracold gases of dysprosium
Laser cooling and trapping of the most magnetic fermionic atom, dysprosium (Dy), may provide a framework to explore quantum liquid crystal (QLC) theory (Chapter 1). This thesis presents details of the Dy laser cooling and trapping apparatus including the laser systems at 421, 741, and 1064 nm, the …
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A Trapped Single Ion Inside a Bose-Einstein Condensate
… have been built. Systems of single or a few trapped ions have been used to demonstrate universal quantum computing algorithms and to detect variations of fundamental constants in precision atomic clocks. Now in our experiment we investigate how the two systems can be advantageously combined. …
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A new apparatus to simulate fundamental interactions with ultracold atoms
… the two miscible components |F = ±1⟩ if trapped by a spin-independent potential, avoiding the known phenomenon of â€TMbuoyancyâ€TM. Studying the dynamics of such systems for sufficiently long times, with a mixture subject to Zeeman differential energy shifts, requires a specific effort …
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