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10.45 k2 m andersen
- 10. In Reality
- 12. Light assisted collisions (photo-chemistry)
- 13. Cooling with blue detuned light
- 14. Image of single atom
- 15. Counting Atoms M. McGovern, Andrew Hilliard, T. Gr ünzweig, and M. F. A., Opt. Lett., 36, 1041, 2011. None 1 Atom 2 Atoms
- 16. Preparing individual atoms At each site, atoms undergo pairwise light-assisted collisions, which can either significantly increase their kinetic energy, or cause them to form a molecule. Either way, both atoms are lost more quickly than we can observe, so that sites that are initially occupied by an even number of atoms become empty and sites that are initially odd-occupied end up with a single atom
- 17. Individual Collisions + + + = + + =
- 18. Efficient Preparation 83% T. Grünzweig, A. Hilliard, M. McGovern, M. F. A., Nature Physics 6, 951-954, 2010.
- 19. What is missing?
- 20. Detuning
- 21. Multi-level structure Figure: Thad Walker
- 24. Power
Notas del editor
- Thanks to the organizers for inviting me Thank you all for coming. Led me start by acknowledging those who have done the hard work:
- There is a RB-85 mot in the center of a UHV chamber Close by there is a high numerical aperture lens This lens focuses down a far off resonant laser beam to form an optical dipole trap for the atoms which yields a conservative potential where the atoms are trapped in the focus of the laser beam. We can form spot-sizes down to 760 nm, but for the experiments I am going to talk about today we use 1.8 um. Because the volume of the micro-trap is so small the density of atoms is high, even with few atoms in the trap. F.ex. The peak density for a single atom exceeds 10^12 pr cm^3. We load atoms from the MOT into the optical microtrap, and by changing parameters we can load average numbers from 0 to 200 atoms. The same high NA lens is used as the first element in an imaging system that images flourescence from trapped atoms onto a low light sensitive camera. We then have a retro-reflected probing beam that is used to manipulate the atoms in the trap and to induce flourescencs for imaging. The probe beam is on the D1 line and all other lasers are on the D2 line such that we can simply elliminate stray light from our images using standart interference filters.