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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.54: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Vibrational ground state cooling of a neutral atom in a tightly focused optical dipole trap. — •Syed Abdullah Aljunid1, JianWei Lee1, Martin Paesold2, Brenda Chng1, Gleb Maslennikov1, and Christian Kurtsiefer1 — 1Centre for Quantum Technologies / Dept. of Physics, National University of Singapore — 2ETH, Zurich
Recent experiments have shown that an efficient interaction between a single trapped atom and light can be established by concentrating light field at the location of the atom by focusing [1-3]. However, to fully exploit the benefits of strong focusing one has to pinpoint the atom at the maximum of the field strength. The position uncertainty due to residual kinetic energy of the atom in the dipole trap (depth ∼ 1 mK) after molasses cooling is significant (few 100 nm) already for moderate focusing strength [2]. To address this problem we implement a Raman Sideband cooling technique, similar to the one commonly used in ion traps [4], to cool a single 87Rb atom to the ground state of the trap. We have cooled the atom along the transverse trap axis (trap frequency ντ=55 kHz), to a mean vibratonal state nτ=0.55 and investigate the impact on atom-light interfaces.
[1] M. K. Tey, et al., Nature Physics 4 924 (2008)
[2] M. K. Tey et. al., New J. Phys. 11, 043011 (2009)
[3] S.A. Aljunid et al., Phys. Rev. Lett. 103, 153601 (2009)
[4] C. Monroe et al., Phys. Rev. Lett. 75, 4011 (1995)