Now showing items 1-8 of 8

    • Bose-Einstein Condensation of 84Sr 

      Martinez de Escobar, Y.N.; Mickelson, P.G.; Yan, M.; DeSalvo, B.J.; Nagel, S.B.; Killian, T.C. (2009)
      We report Bose-Einstein condensation of Sr84 in an optical dipole trap. Efficient laser cooling on the narrow intercombination line and an ideal s-wave scattering length allow the creation of large condensates (N0∼3×105) ...
    • Bose-Einstein condensation of 88Sr through sympathetic cooling with 87Sr 

      Mickelson, P.G.; Martinez de Escobar, Y.N.; Yan, M.; DeSalvo, B.J.; Killian, T.C. (2010-05-05)
      We report Bose-Einstein condensation of Sr88, which has a small, negative s-wave scattering length (a88=−2a0). We overcome the poor evaporative cooling characteristics of this isotope by sympathetic cooling with Sr87 atoms. ...
    • Controlling Condensate Collapse and Expansion with an Optical Feshbach Resonance 

      Yan, Mi; DeSalvo, B.J.; Ramachandhran, B.; Pu, H.; Killian, T.C. (2013)
      We demonstrate control of the collapse and expansion of an Sr88 Bose-Einstein condensate using an optical Feshbach resonance near the S01−P13 intercombination transition at 689 nm. Significant changes in dynamics are caused ...
    • Degenerate Fermi Gas of 87Sr 

      DeSalvo, B.J.; Yan, M.; Mickelson, P.G.; Martinez de Escobar, Y.N.; Killian, T.C. (2010-07-13)
      We report quantum degeneracy in a gas of ultracold fermionic Sr87 atoms. By evaporatively cooling a mixture of spin states in an optical dipole trap for 10.5 s, we obtain samples well into the degenerate regime with ...
    • Numerical modeling of collisional dynamics of Sr in an optical dipole trap 

      Yan, M.; Chakraborty, R.; Mazurenko, A.; Mickelson, P.G.; Martinez de Escobar, Y.N.; DeSalvo, B.J.; Killian, T.C. (2011)
      We describe a model of inelastic and elastic collisional dynamics of atoms in an optical dipole trap that utilizes numerical evaluation of statistical mechanical quantities and numerical solution of equations for the ...
    • Rydberg-blockade effects in Autler-Townes spectra of ultracold strontium 

      DeSalvo, B.J.; Aman, J.A.; Gaul, C.; Pohl, T.; Yoshida, S.; Burgdörfer, J.; Hazzard, K.R.A.; Dunning, F.B.; Killian, T.C. (2016)
      We present a combined experimental and theoretical study of the effects of Rydberg interactions on Autler-Townes spectra of ultracold gases of atomic strontium. Realizing two-photon Rydberg excitation via a long-lived ...
    • Trap losses induced by near-resonant Rydberg dressing of cold atomic gases 

      Aman, J.A.; DeSalvo, B.J.; Dunning, F.B.; Killian, T.C.; Yoshida, S.; Burgdörfer, J. (2016)
      The near-resonant dressing of cold strontium gases and Bose-Einstein condensates contained in an optical dipole trap (ODT) with the 5s30s3S1 Rydberg state is investigated as a function of the effective two-photon Rabi ...
    • Ultra-long-range Rydberg molecules in a divalent atomic system 

      DeSalvo, B.J.; Aman, J.A.; Dunning, F.B.; Killian, T.C.; Sadeghpour, H.R.; Yoshida, S.; Burgdörfer, J. (2015)
      We report the creation of ultra-long-range Sr2 molecules comprising one ground-state 5s2 1S0 atom and one atom in a 5sns 3S1 Rydberg state for n ranging from 29 to 36. Molecules are created in a trapped ultracold atomic ...