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Content available remote Ionization spectroscopy in cold rubidium atoms
We demonstrate photoionization spectroscopy in cold rubidium atoms trapped in a working magneto-optical trap. Three-photon ionization with two-photon resonance proceeds along various channels, with the step-by-step 5S–5P–5D transition and with the two-photon excitation of the 5D or 7S state. The processes are monitored by measuring ion signals which allow sensitive spectroscopy of weak transitions in a cold-atom sample.
This report concerns the experiment of precision spectroscopy of cold strontium atoms in the Polish National Laboratory of Atomic, Molecular and Optical Physics in Toruń. The system is composed of a Zeeman slower and magneto-optical traps (at 461 nm and 689 nm), a frequency comb, and a narrow-band laser locked to an ultra-stable optical cavity. All parts of the experiment are prepared and the first measurements of the absolute frequency of the 1S0-3P1, 689 nm optical transition in 88Sr atoms are performed.
Content available remote Bistability of Feshbach resonance in optical cavity
Open Physics
tom 12
nr 6
We consider Feshbach resonance in an optical cavity where photons interact with atoms and molecules dispersively. From mean-field theory we obtain multiple fixed-point solutions, which is strongly related to the phenomenon of bistability. Adiabatic evolutions demonstrate hysteretic behaviors by varying pump-cavity detuning from opposite directions. We also use the quantum model to check mean-field results which match perfectly. The analysis here may enrich the study of particle-photon interaction systems.
Content available remote Diagnostics and loading of an atomic optical dipole trap
We describe diagnostic techniques used for optimization of loading of an optical dipole trap with CO2 laser and 87Rb atoms. Atoms, precooled in a magneto-optical trap, were loaded into the trap formed by a weakly focused CO2 laser beam with the waist of about 150 žm and power of 50 W. In addition to determining the atom number and temperature, the effect of the loading geometry on the time evolution of trapped atoms is discussed. It is shown that a direct study of this evolution can be used for determining the trap frequencies.
Content available remote Magneto-optical Trap: Fundamentals and Realization
Principles of laser cooling and trapping of atoms with regard to the magneto-optical trap (MOT) are described. Some details of the MOT and the accompanying measuring system, both constructed at the Institute of Physics, PAS in Warsaw, are given. Two examples of experimental results are shown.
The paper describes setting up an experiment for cooling and trapping of strontium atoms for applications in quantum measurements and metrology. The energy level structure of strontium atoms is discussed from this perspective. The details of the vacuum chamber and laser system dedicated for strontium optical clock are presented. Present status of the project together with its possible future applications are outlined.
W artykule opisany został układ przygotowywany do chłodzenia i pułapkowania atomów strontu, które będą wykorzystywane w pomiarach kwantowych i metrologii. Z tej perspektywy omówiony został układ poziomów energetycznych strontu. Opisany został układ próżniowy i laserowy zoptymalizowany do budowy strontowego, optycznego zegara atomowego. Przedstawiony został obecny status. Zarysowanie zostały możliwe
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