We studied light assisted collisions of Tm atoms in a magneto optical trap (MOT) for the first time, working on a weak cooling transition at 530.7 nm ( 13 24f ( H )5d 6s , 9 / 2, 5 JF ). We observed a strong influence from radiation trapping and light assisted collisions on the dynamics of this trap. We carefully separated these two contributions and measured the binary loss rate constant at different laser powers and detuning frequencies near the cooling transition. Analyzing losses from the MOT, we found the light assisted inelastic binary loss rate constant to reach values of up to 93 10 cm s and gave the upper bound on a branching ratio 6 0.8 10 k for the 530.7 nm transition.II.
We report on accurate measurements of the scalar αS and tensor αT polarizabilities of the 5D fine structure levels 5D 3/2 and 5D 5/2 in Rb. The measured values (in atomic units) αS(5D 3/2 ) = 18400(75), αT (5D 3/2 ) = −750(30), αS(5D 5/2 ) = 18600(76) and αT (5D 5/2 ) = −1440(60) show reasonable correspondence to previously published theoretical predictions, but are more accurate. We implemented laser excitation of the 5D level in a laser cooled cloud of optically polarized Rb-87 atoms placed in a constant electric field.
We determine the frequency of the ultranarrow 87 Sr 1 S 0-3 P 2 transition by spectroscopy of an ultracold gas. This transition is referenced to four molecular iodine lines that are observed by Doppler-free saturation spectroscopy of hot iodine vapor. The frequency differences between the Sr and the I 2 transitions are measured with an uncertainty of 0.5 MHz. The absolute frequency of the 87 Sr 1 S 0-3 P 2 (F = 7/2) transition is 446 648 775(30) MHz and limited in accuracy by the iodine reference. This work prepares the use of the Sr 1 S 0-3 P 2 transition for quantum simulation and computation.
Imaging and manipulating individual atoms with submicrometer separation can be instrumental for quantum simulation of condensed matter Hamiltonians and quantum computation with neutral atoms. Quantum gas microscope experiments in most cases rely on quite costly solutions. Here we present an open-source design of a microscope objective for atomic strontium consisting solely of off-the-shelf lenses that is diffraction-limited for 461 nm light. A prototype built with a simple stacking design is measured to have a resolution of 0.63(4) µm, which is in agreement with the predicted value. This performance, together with the near diffraction-limited performance for 532 nm light makes this design useful for both quantum gas microscopes and optical tweezer experiments with strontium. Our microscope can easily be adapted to experiments with other atomic species such as erbium, ytterbium, and dysprosium, as well as Rydberg experiments with rubidium.
A 100W fiber laser system is used to drive a high repetition rate HHG beamline producing record-high photon flux of >1011 photons/s at 69-75eV and >1010 photons/s for harmonics between 115eV and 140eV.
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