Drullinger, R. E.

Ferrari, Gabriele

Poli, Nicola

Sorrentino, Fiodor

Tino, Guglielmo Maria

English

Florence Research

EGAS38 Ischia 2006 Short Reports B 35A strontium sample for ultracold atomic physics,high-precision spectroscopy and quantum sensorsF. Sorrentino, G. Ferrari, N. Poli, R. Drullinger and G. M. TinoDipartimento di Fisica and LENS, Istituto Nazionale Fisica Nucleare, Istituto Nazionale Fisica dellaMateria,Polo Scientifico-Universita` di Firenze, 50019 Sesto Fiorentino, ItalyE-mail:sorrentino@fi.infn.itRecently, laser-cooled atomic strontium has been the subject of active research in several fieldsspanning from all-optical cooling towards quantum degeneracy for bosonic and fermionic isotopes,cooling physics, continuous atom laser, detection of ultra-narrow transitions, multiple scattering, andcollisional theory.Much of that interest relies on the features of the electronic level structure of alkali-earth atoms,that make them ideal systems for laser manipulation and realization of quantum devices. Amongthe alkali-earths, strontium summarizes most of the useful properties both for the preparation ofultracold samples and for applications.We describe the production of atomic strontium samples at ultra-low temperature and at high phase-space density, and their possible use as quantum sensors for frequency metrology and highly sensitivedevices.Our apparatus allows for simultaneous loading of a far-off-resonant optical dipole trap with differentisotopes[1]. We performed collisional studies in the μK temperature domain. Our analysis provesthat the 88Sr isotope has a remarkably small s-wave scattering length, in agreement with results fromphotoassociation spectra[2,3]. It also shows the occurrence of 88Sr-86Sr interspecies elastic collisions.We exploited such fact to implement an optical sympathetic cooling scheme, thus increasing thephase-space density by one order of magnitude[4].Part of our experiment concerns with high-resolution spectroscopy and accurate optical frequencymeasurements[5]. Here we also present our recent advances towards the realization of an opticalfrequency standard based on the highly forbidden 1S0-3P0 intercombination line at 698 nm on theeven Sr isotopes.In ground-state 88Sr atoms, the combination of small elastic cross-section and virtual immunity fromstray magnetic fields may represent a critical advantage for the realization of quantum sensors, byreducing the possible sources of perturbation. We actually observe persistent Bloch oscillations[6]of 88Sr atoms in a vertical 1-D optical lattice up to 10 seconds. As an example, we determine thegravitational acceleration in our lab[7]. We discuss the possible applications of our system to measureforces at micrometer scale.References[1] N. Poli, R. E. Drullinger, G. Ferrari, J. Le´onard,F. Sorrentino and G. Tino, Phys. Rev. A 71,061403(R) (2005).[2] M. Yasuda, T. Kishimoto, M. Takamoto and H. Katori, arXiv:physics/0501053 (2004).[3] P. G. Mickelson, Y. N. Martinez, A. D. Saenz, S. B. Nagel, Y. C. Chen and T. C. Killian, Phys.Rev. Lett. 95, 223002 (2005)[4] G. Ferrari, N. Poli, R. E. Drullinger, F. Sorrentino and G. Tino, Phys. Rev. A. 73, 023408 (2006).[5] G. Ferrari, P. Cancio, R. Drullinger, G. Giusfredi, N. Poli, M. Prevedelli, C. Toninelli and G. M.Tino, Phys. Rev. Lett. 91, 243002 (2003).[6] F. Bloch, Z. Phys. 52, 555 (1929).[7] G. Ferrari, N. Poli, F. Sorrentino and G. Tino, to be published.

A strontium sample for ultracold atomic physics, high-precision spectroscopy and quantum sensors

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A strontium sample for ultracold atomic physics, high-precision spectroscopy and quantum sensors

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