Frequency comb atom interferometry Debavelaere, Clément; Solaro, Cyrille; Cladé, Pierre ...
EPJ Web of conferences,
2023, Letnik:
287
Journal Article
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We have implemented of a light pulse atom interferometer based on the diffraction of free-falling atoms of Rubidium by a picosecond frequency-comb laser. We have studied the impact of the pulses’ ...length as well as of the interrogation time on the contrast of the fringes. Our data are well reproduce by a theoretical model based on the effective coupling which depend on the overlap between the pulses and the atoms. This technique, which we demonstrated in the visible spectrum on Rb atoms, paves the way for extending light-pulse interferometry to other spectral regions (deep-UV to X-UV) and therefore to new species, since one can benefit from the high peak intensity of the ultrashort pulses which makes nonlinear frequency conversion in crystals and gas targets more efficient.
We demonstrate a light-pulse atom interferometer based on the diffraction of free-falling atoms by a picosecond frequency-comb laser. More specifically, we coherently split and recombine wave packets ...of cold $^{87}$Rb atoms by driving stimulated Raman transitions between the $|5s~^2S_{1/2},F=1\rangle$ and $|5s~^2S_{1/2},F=2\rangle$ hyperfine states, using two trains of picosecond pulses in a counter-propagating geometry. We study the impact of the pulses length as well as of the interrogation time onto the contrast of the atom interferometer. Our experimental data are well reproduced by a numerical simulation based on an effective coupling which depends on the overlap between the pulses and the atomic cloud. These results pave the way for extending light-pulse interferometry to transitions in other spectral regions and therefore to other species, for new possibilities in metrology, sensing of gravito-inertial effects and tests of fundamental physics.
We perform high-resolution spectroscopy of the 3d 2D3/2 − 3d 2D5/2 interval in all stable even isotopes of ACa+ (A = 40 , 42, 44, 46, and 48) with an accuracy of ∼ 20 Hz using direct frequency-comb ...Raman spectroscopy. Combining these data with isotope shift measurements of the 4s 2S1/2 ↔ 3d 2D5/2 transition, we carry out a King plot analysis with unprecedented sensitivity to coupling between electrons and neutrons by bosons beyond the standard model. Furthermore, we estimate the sensitivity to such bosons from equivalent spectroscopy in Ba+ and Yb+. Finally, the data yield isotope shifts of the 4s 2S1/2 ↔ 3d 2D3/2 transition at 10 parts per billion through combination with recent data of Knollmann, Patel, and Doret Phys. Rev. A 100, 022514 (2019).
We perform high-resolution spectroscopy of the 3d2D3/2 − 3d2D5/2 interval in all stable even isotopes of ACa+ (A = 40, 42, 44, 46, and 48) with an accuracy of ∼20 Hz using direct frequency-comb Raman ...spectroscopy. Combining these data with isotope shift measurements of the 4s 2S1/2 ↔ 3d2D5/2 transition, we carry out a King plot analysis with unprecedented sensitivity to coupling between electrons and neutrons by bosons beyond the standard model. Furthermore, we estimate the sensitivity to such bosons from equivalent spectroscopy in Ba+ and Yb+. Finally, the data yield isotope shifts of the 4s 2S1/2 ↔ 3d2D3/2 transition at 10 parts per billion through combination with recent data of Knollmann, Patel, and Doret Phys. Rev. A 100, 022514 (2019).
We report on the use of an ultracold ensemble of 87Rb atoms trapped in a vertical lattice as a source for a quantum force sensor based on a Ramsey–Raman type interferometer. We reach spatial ...resolution in the low micrometer range in the vertical direction thanks to evaporative cooling down to ultracold temperatures in a crossed optical dipole trap. In this configuration, the coherence time of the atomic ensemble is degraded by inhomogeneous dephasing arising from atomic interactions. By weakening the confinement in the transverse direction only, we dilute the cloud and drastically reduce the strength of these interactions, without affecting the vertical resolution. This allows us to maintain an excellent relative sensitivity on the Bloch frequency, which is related to the local gravitational force, of 5 נ10−6 at 1 s which integrates down to 8 נ10−8 after one hour averaging time.
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