Influence of chirping the Raman lasers in an atom gravimeter: Phase shifts due to the Raman light shift and to the finite speed of light

Cheng, Bing; Gillot, Pierre‐Yves; Merlet, Sébastien; Santos, F. Pereira Dos

doi:10.1103/physreva.92.063617

Cited by 18 publications

(11 citation statements)

References 35 publications

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“…Indeed, we create a sequence of Bragg pulses which coherently split, redirect, and recombine the BEC. The frequency difference of the lasers can be adjusted such that there is either a momentum transfer in the up-or downward direction [10,34], which allows us to suppress the effect of recoil-dependent shifts on the interferometer phase with alternating momentum transfer [35,36]. The atom number at the output ports of the interferometer is detected below the atom chip by absorption imaging with a CCD camera.…”

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confidence: 99%

Atom-Chip Fountain Gravimeter

et al. 2016

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We demonstrate a quantum gravimeter by combining the advantages of an atom chip for the generation, delta-kick collimation, and coherent manipulation of freely falling Bose-Einstein condensates (BECs) with an innovative launch mechanism based on Bloch oscillations and double Bragg diffraction. Our high-contrast BEC interferometer realizes tens of milliseconds of free fall in a volume as little as a one centimeter cube and paves the way for measurements with sub-μGal accuracies in miniaturized, robust devices.

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confidence: 99%

Atom-Chip Fountain Gravimeter

et al. 2016

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“…About 10 8 atoms are released in free fall for 200 ms and prepared in the |m F = 0 magnetic state in a narrow vertical velocity distribution. We then apply the interferometer sequence which lasts a total time of 2T = 160 ms. As discussed earlier, the Raman lasers are kept resonant with the atoms during the free fall, by actually chirping one of the two Raman lasers [19], so as to compensate for the linearly increasing Doppler shift.…”

Section: A Experimental Setupmentioning

confidence: 99%

Impact of direct-digital-synthesizer finite resolution on atom gravimeters

2020

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We report on the study of the impact of the finite resolution of the chirp rate applied on the frequency difference between the Raman lasers beamsplitters onto the phase of a free fall atom gravimeter. This chirp induces a phase shift that compensates the one due to gravity acceleration, allowing for its precise determination in terms of frequencies. In practice, it is most often generated by a direct digital synthesizer (DDS). Besides the effect of eventual truncation errors, we evaluate here the bias on the g measurement due to the finite time and frequency resolution of the chirp generated by the DDS, and show that it can compromise the measurement accuracy. However, this effect can be mitigated by an adequate choice of the DDS chirp parameters resulting from a trade-off between interferometer phase resolution and induced bias.

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“…Consequently, third-order diffraction might be an interesting tool for the diffraction of wave packets with a narrow momentum distribution like BECs, since it allows to reduce the complexity of the experiment. In general, each transition of a sequence might introduce spurious phase contributions [48] and using less pulses may facilitate the suppression of some uncertainties connected to frequency chirps [49][50][51]. Furthermore, the overall duration of a single pulse can become shorter than than that of a corresponding sequence of pulses, which might be particularly appealing for very compact set-ups [52] intended for real-world applications [53].…”

Section: Comparison To First-order and Sequential Pulsesmentioning

confidence: 99%

Atomic Raman scattering: Third-order diffraction in a double geometry

Hartmann,

Jenewein,

Abend

et al. 2020

Preprint

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In a retroreflective scheme atomic Raman diffraction adopts some of the properties of Bragg diffraction due to additional couplings to off-resonant momenta. As a consequence, double Raman diffraction has to be performed in a Bragg-type regime. Taking advantage of this regime, double Raman allows for resonant higher-order diffraction. We study theoretically the case of third-order diffraction and compare it to first order as well as a sequence of first-order pulses giving rise to the same momentum transfer as the third-order pulse. In fact, third-order diffraction constitutes a competitive tool for the diffraction of ultracold atoms and interferometry based on large momentum transfer since it allows to reduce the complexity of the experiment as well as the total duration of the diffraction process compared to a sequence. II. FIRST-ORDER DIFFRACTION A. Double Raman diffractionAn atom at rest interacts with two strongly detuned optical gratings (with a detuning much larger than the linewidth) that move in opposite directions, each one

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Influence of chirping the Raman lasers in an atom gravimeter: Phase shifts due to the Raman light shift and to the finite speed of light

Cited by 18 publications

References 35 publications

Atom-Chip Fountain Gravimeter

Atom-Chip Fountain Gravimeter

Impact of direct-digital-synthesizer finite resolution on atom gravimeters

Atomic Raman scattering: Third-order diffraction in a double geometry

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