Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 55, Number 9
Friday–Saturday, October 15–16, 2010; Ogden, Utah
Session H6: Atomic, Molecular, and Optical Physics II |
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Chair: Daniel Schroeder, Weber State University Room: 316 |
Saturday, October 16, 2010 9:00AM - 9:12AM |
H6.00001: Matter Wave Interferometery with Strontium 87 Ions Christopher Erickson, Mary Lyon, James Archibald, Dallin Durfee We present progress on a strontium ion interferometer for use as an electromagnetic field sensor with unprecedented sensitivity. Applications include measurements of fringing fields, studies of image charge scattering in superconductors, and ultra-precise tests of electromagnetism. [Preview Abstract] |
Saturday, October 16, 2010 9:12AM - 9:24AM |
H6.00002: Laser Cooled Strontium Source for an Ion Interferometer Mary Lyon, James Archibald, Christopher Erickson, Dallin Durfee We present a Strontium-87 magneto-optical trap (MOT) in a Low-Velocity-Intense-Source (LVIS) as the source of cooled, collimated atoms for an ion interferometer. Laser cooling and trapping is accomplished with a 461 nm frequency doubled laser and a pair of permanent magnets. A beam of cooled atoms is produced by passing the atoms through a hole drilled in one of the retroreflecting optics. The atoms are then photo-ionized in a two photon process. [Preview Abstract] |
Saturday, October 16, 2010 9:24AM - 9:36AM |
H6.00003: Coulomb explosion measurements of ultra-low density ultracold plasmas Abigail Wilkins, Scott Bergeson We propose to use time-of-flight spectroscopy of an ultracold neutral plasma to determine the density of very small plasmas. The plasma is created by photo-ionizing laser-cooled atoms in a magneto-optical trap. When the electron temperature is high enough, the plasma expands because of a strong space-charge effect. We will measure this expansion using a time-of-flight spectrometer. We present a model that predicts the expected flight times. This method appears to be useful for plasmas with densities below 10$^7$ cm$^{-3}$. [Preview Abstract] |
Saturday, October 16, 2010 9:36AM - 9:48AM |
H6.00004: Relaxation rates of low-field gas-phase $^{129}$Xe storage cells Mark Limes, Brian Saam A study of longitudinal nuclear relaxation rates T$_{1}$ of $^{129}$Xe and Xe-N$_{2}$ mixtures in a magnetic field of ~3.8 mT is presented. In this regime, intrinsic spin relaxation is dominated by the intramolecular spin-rotation interaction due to persistent xenon dimers, a mechanism that can be quelled by introducing large amounts of N$_{2}$ into the storage cell. Extrinsic spin relaxation is dominated by the wall-relaxation rate, which is the primary quantity of interest for the various low-field storage cells and coatings that we have tested. Previous group work has shown that extremely long gas-phase relaxation times T$_{1}$ can be obtained, but only at large magnetic fields and low xenon densities. The current work is motivated by the practical benefits of retaining hyperpolarized $^{129}$Xe for extended periods of time in a small magnetic field. [Preview Abstract] |
Saturday, October 16, 2010 9:48AM - 10:00AM |
H6.00005: Coherence Perserving Quantum Nondemolition Measurements Justin Bohnet, Zilong Chen, Shannon Sankar, Jiayan Dai, James K. Thompson We demonstrate that the collective vacuum Rabi splitting can be used to perform quantum nondemolition measurements on the clock states of $10^6$~$^{87}$Rb atoms in an optical cavity. We observe a 13(1)~dB increase in sensitivity over sampled measurements and a precision 8.6(2.6)~dB below the projection noise level. We infer the preparation of spin squeezed states with sensitivities 3.4(6)~dB below the standard quantum limit and directly observe a 1.1(4)~dB spectroscopic improvement. The measurement is enhanced using a large ensemble and may lead to more precise atomic sensors. [Preview Abstract] |
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