Long term laser frequency control for applications in atomic physics

Varcoe, Benjamin T. H.; Hall, Budd L.; Johnson, George C.; Johnson, P. M.; MacGillivray, W. R.; Standage, M. C.

doi:10.1088/0957-0233/11/11/402

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…Velocity selection is provided by angling the excitation laser towards the main atomic beam at 11 • to the normal. The dye laser was locked, by means of an external feedback control [71], to the 5S 1/2 (F = 3)-63P 3/2 transition of the reference atomic beam excited at normal incidence. The exciting laser light from the frequency-doubled laser is linearly polarized and aligned with the linear polarization of the microwave cavity.…”

Section: Experimental Set-up Of the One-atom Masermentioning

confidence: 99%

Cavity quantum electrodynamics

et al. 2006

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This paper reviews the work on cavity quantum electrodynamics of free atoms. In recent years, cavity experiments have also been conducted on a variety of solid-state systems resulting in many interesting applications, of which microlasers, photon bandgap structures and quantum dot structures in cavities are outstanding examples. Although these phenomena and systems are very interesting, discussion is limited here to free atoms and mostly single atoms because these systems exhibit clean quantum phenomena and are not disturbed by a variety of other effects. At the centre of our review is the work on the one-atom maser, but we also give a survey of the entire field, using free atoms in order to show the large variety of problems dealt with. The cavity interaction can be separated into two main regimes: the weak coupling in cavity or cavity-like structures with low quality factors Q and the strong coupling when high-Q cavities are involved. The weak coupling leads to modification of spontaneous transitions and level shifts, whereas the strong coupling enables one to observe a periodic exchange of photons between atoms and the radiation field. In this case, atoms and photons are entangled, this being the basis for a variety of phenomena observed, some of them leading to interesting applications in quantum information processing. The cavity experiments with free atoms reached a new domain with the advent of experiments in the visible spectral region. A review on recent achievements in this area is also given.

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Section: Experimental Set-up Of the One-atom Masermentioning

confidence: 99%

Cavity quantum electrodynamics

et al. 2006

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“…The frequency drift of the laser was stabilized for long periods of time by locking the laser control electronics to the saturated absorption signal derived from Rb in an external vapour cell. Details of the control electronics and stabilization technique have been published elsewhere (Varcoe et al 2000). Although measurements of individual pseudo-Stokes parameters at any given scattering angle only took a few minutes, stabilization of the laser frequency enabled repeated measurements to be conducted over a long period of time with the confidence that the laser tuning conditions remained unchanged throughout the measurements.…”

Section: The Experimental Apparatusmentioning

confidence: 99%

Superelastic electron scattering from laser excited rubidium at 20 eV incident energy

Hall¹,

Shen²,

Murray³

et al. 2004

J. Phys. B: At. Mol. Opt. Phys.

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Superelastic electron scattering measurements are presented from rubidium atoms excited by laser radiation to the 5 2 P states at around 780 nm. The incident energy of the electrons was 18.4 eV corresponding to 20 eV incident electrons for the excitation process 5 2 S-5 2 P. The measurements were conducted over a range of scattering angles from 5 • through to 125 •. A complete set of atomic collision parameters for the interaction process is presented together with the associated pseudo-Stokes parameters obtained from the measurements. A comparison with three sophisticated theoretical models indicates that none of the models completely describes the interaction process at this energy, and that further experimental and theoretical work is needed.

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“…A Coherent 899 single mode, ring dye laser operated using Kiton red laser dye is used to produce the MOT laser beams. The locking scheme utilizes saturated fluorescence spectroscopy on an isolated sample of metastable neon atoms [23]. The detuning of the laser frequency is controlled by placing a DC magnetic field across the isolated atomic sample which Zeeman shifts the atomic resonance.…”

Section: Techniquementioning

confidence: 99%

Population dynamics in a metastable neon magneto-optical trap

2013

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We observe the population dynamics within a metastable neon magneto-optical trap (MOT) through the measurement of the average squared Clebsch-Gordan coefficient, C 2 , over a range of laser detunings. The magnitude of C 2 is dependent on the internal quantum state of an atom interacting with the light field and is found to show a strong dependence on the applied laser detuning. Previously it has been reported [C. G. Townsend et al, Phys. Rev. A 52, 1423 (1995)] that trapped atoms in a MOT are pumped towards states that interact the most strongly with the local field and therefore the measured value of C 2 is larger than the average over all possible transitions. For the 3 P2 to 3 D3 cooling transition in metastable neon the average C 2 value is equal to 0.46, however we have measured 0.29 ± 0.03 < C 2 < 0.73 ± 0.09. We explain this range of values for C 2 by considering the possible transition rates between the different magnetic sub-levels in the system. This result has significant consequences when measuring trap populations via fluorescence in a MOT.

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Long term laser frequency control for applications in atomic physics

Cited by 6 publications

References 11 publications

Cavity quantum electrodynamics

Cavity quantum electrodynamics

Superelastic electron scattering from laser excited rubidium at 20 eV incident energy

Population dynamics in a metastable neon magneto-optical trap

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