Controlling Raman resonances with magnetic fields

DeSavage, Sara; Davis, J. P.; Narducci, Frank A.

doi:10.1080/09500340.2012.761738

Cited by 12 publications

(8 citation statements)

References 10 publications

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“…We use the D2 transition of 85 Rb and choose |g 1 and |g 2 from the F = 2 and F = 3 hyperfine state manifolds with a frequency separation of approximately 3 GHz [42]. The atoms are loaded into a three-dimensional magnetooptical trap (3D MOT) emerging from a two-dimensional trap (2D MOT) as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…for the T 3 -experiment, transitions with ∆m F = ±1 are suppressed in our experimental setup [42,43].…”

Section: Raman Spectrummentioning

confidence: 99%

“…We observe 11 resonances corresponding to 5 or 6 transitions with ∆mF = 0 or ∆mF = ±1, respectively. Transitions with ∆mF = ±2 are heavily suppressed [42].…”

Section: Imperfect Pulses and Decoherencementioning

confidence: 99%

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T 3-Interferometer for atoms

et al. 2017

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The quantum mechanical propagator of a massive particle in a linear gravitational potential derived already in 1927 by Earle H. Kennard [2, 3] contains a phase that scales with the third power of the time T during which the particle experiences the corresponding force. Since in conventional atom interferometers the internal atomic states are all exposed to the same acceleration a, this T 3 -phase cancels out and the interferometer phase scales as T 2 . In contrast, by applying an external magnetic field we prepare two different accelerations a 1 and a 2 for two internal states of the atom, which translate themselves into two different cubic phases and the resulting interferometer phase scales as T 3 . We present the theoretical background for, and summarize our progress towards experimentally realizing such a novel atom interferometer.

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Section: Methodsmentioning

confidence: 99%

“…for the T 3 -experiment, transitions with ∆m F = ±1 are suppressed in our experimental setup [42,43].…”

Section: Raman Spectrummentioning

confidence: 99%

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T 3-Interferometer for atoms

et al. 2017

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“…However, as atoms move in a magnetic gradient, the resonance condition for the Raman pulses changes in time, thereby necessitating some a priori knowledge of the magnetic field gradient in order to chirp the Raman appropriately. Here, we demonstrate a method to measure the magnetic field gradient using the same apparatus that will ultimately make up the atom interferometer.Raman spectroscopy can be used in conjunction with cold atoms to determine the magnetic field strength and also some additional information about the field orientation [2]. Briefly, the frequency separation between the clock transition and one of the magnetically sensitive transitions is determined by the magnitude of the magnetic field.…”

mentioning

confidence: 99%

“…Raman spectroscopy can be used in conjunction with cold atoms to determine the magnetic field strength and also some additional information about the field orientation [2]. Briefly, the frequency separation between the clock transition and one of the magnetically sensitive transitions is determined by the magnitude of the magnetic field.…”

mentioning

confidence: 99%

Magnetic Gradiometer Using Simultaneous Measurements on Two Cold Atom Clouds

DeSavage

Srinivasan

Braje

et al. 2015

Frontiers in Optics 2015

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We present measurements of magnetic gradients using atom clouds. Atoms are collected in a 3D MOT and half the atoms are launched. Raman spectroscopy is performed, determining the magnetic field at each atom cloud. In earlier work, we proposed the measurement of magnetic field gradients using atom interferometry techniques [1]. That technique involves the use of Raman π/2 pulses and π pulses to form the atom optic analog of a Mach-Zehnder interferometer. However, as atoms move in a magnetic gradient, the resonance condition for the Raman pulses changes in time, thereby necessitating some a priori knowledge of the magnetic field gradient in order to chirp the Raman appropriately. Here, we demonstrate a method to measure the magnetic field gradient using the same apparatus that will ultimately make up the atom interferometer.Raman spectroscopy can be used in conjunction with cold atoms to determine the magnetic field strength and also some additional information about the field orientation [2]. Briefly, the frequency separation between the clock transition and one of the magnetically sensitive transitions is determined by the magnitude of the magnetic field. The relative heights of all of the Raman transitions provides information about the orientation of the magnetic field. Therefore, a measurement of the center frequency of a magnetically sensitive transition (in our case, we use the first resonance blue-shifted from the clock transition) provides information about the magnitude of the magnetic field. A measurement of the resonance at two locations provides information about the magnetic field gradient, but this method alone does not distinguish between temporal and spatial gradients.In our experiments, we collect atoms in a 3-dimensional dark spot MOT and vertically launch half of the collected atoms and leave half the atoms behind. Using Raman fields that are co-propagating in the vertical direction, we can simultaneously perform Raman spectroscopy on the two atom clouds. Determination of the location of the resonance of a magnetically sensitive transition from each cloud provides information about the magnetic field strength at the location of the Raman pulse simultaneously and hence forms the basis for a gradient magnetometer.In the talk, we we present the results of our measurements in a field that intentionally has a vertical magnetic field gradient. We describe an analysis that provides for the ultimate sensitivity of such a device. Finally, we discuss various systematic measurement issues.

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