Browsing Department of Physics, UW-Madison by Author "Walker, Thad G."
Now showing items 1-11 of 11
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Anisotropic Spin-Exchange
Walker, Thad G.; Kadlecek, Stephen; Nelson, Ian (2009-11-25)Using measured spin-transfer rates from alkali atoms to 3He, combined with spin-relaxation rates of the alkali atoms due to 3He and 4He, it should be possible to di?erentiate between isotropic and anisotropic spin-exchange. ... -
Codes to accompany "Optically Pumped Atoms"
Walker, Thad G.; Happer, William; Jau, Yuan-Yu (2009) -
DAMOP Student Symposium 2009
Walker, Thad G. (2009-05-27)Presentation given at the student symposium for DAMOP 2009, Charlottesville, VA, May 21 2009. Includes an introduction to Rydberg physics with a description of recent experiments done at the University of Wisconsin -
Dynamics of Low Density Rydberg Gases
Brekke, Erik; Day, Jason O.; Walker, Thad G. (2008-06-09)A state-dependent stimulated emission probe was used to investigate the coherent and dynamic properties of cold Rydberg atoms. 87Rb atoms were excited to various nl Rydberg states from a MOT via continuous two-photon ... -
Jim Lawler's Science: Above and Below the H-Line
Walker, Thad G. (2018-04-27)This presentation gives an overview of Jim Lawler's career, focusing on a few of his important contributions to science. -
Non-Degenerate Four-Wave Mixing through Rydberg States in a MOT
Day, Jason; Brekke, Erik; Walker, Thad G. (2007-07-02)In this work, we use a three-photon near-resonant process in a laser-cooled Rb vapor to achieve phase-matched four-wave mixing using an intermediate Rydberg state. Rydberg atoms in the 36D5/2 state are efficiently produced ... -
Physics Challenges for Spin-Exchange Optical Pumping of He-3
Walker, Thad G. (2009-05-28)Presentation given at the "Physics and Applications of Polarized Noble Gases" workshop at the University of Virginia, May 19, 2009. -
A Portable Ultrasensitive SERF Atomic Magnetometer for Biomagnetic Measurements
Wyllie, Robert; Li, Zhimin; Cook, Peter; Wakai, Ronald T.; Walker, Thad G. (2007-07-02)We present a portable Rb cell atomic magnetometer suited for biomagnetic measurements. Working in the spin-exchange relaxation free regime, we demonstrate an initial white noise floor of 60 fT/sqrt {Hz}. We show an adult ... -
A Portable Ultrasensitive SERF Atomic Magnetometer for Biomagnetic Measurements
Proite, Nicholas; Cook, Peter; Li, Zhimin; Wakai, Ronald T.; Walker, Thad G.; Wyllie, Robert (2009-09-10)We present a portable Rb cell atomic magnetometer suited for biomagnetic measurements. Working in the spin-exchange relaxation free regime, we demonstrate an initial white noise floor of 60 fT$/\sqrt {Hz} $. We show an ... -
RayTrace
Walker, Thad G. (1998-03-13)This applet traces paraxial light rays through a user-specified system of up to 12 ideal thin lenses and apertures, allowing many simple optical instruments to be modelled. Three examples are given: coupling of light from ... -
Ultrasensitive Atomic Magnetometers
Wyllie, Robert; Wakai, Ronald T.; Walker, Thad G. (2009-09-10)We have developed a novel, small-volume portable single-channel atomic biomagnetometer and have used it to detect adult MCG signals. The cryogenic-free magnetometer has sufficiently high sensitivity (20 fT/rt(Hz)) that ...