Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster 2: Intersectional Session
Q 23.56: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
Optimal pulse shaping for excitation of single atoms in free-space. — •Dao Hoang Lan, Syed Abdullah Aljunid, Brenda Chng, Gleb Maslennikov, and Christian Kurtsiefer — Centre for Quantum Technologies / Dept. of Physics, National University of Singapore
Recent theoretical works suggest that an optimal excitation of single atoms can be performed by optical pulses that are time reversed replica of spontaneously emitted light [1,2]. In the time domain this would constitute a pulse with an envelope given by rising exponential function, followed by a fast drop. The time constant τc of such exponential pulse should correspond to the lifetime of atomic excited state. We present an experimental implementation based on an electronic circuit that allows to generate electrical pulses with τc=27 ns which is compatible to the D2 transition in 87Rb. The output of the circuit is multiplied with an RF carrier at 1.5 GHz and the resulting product sent to a fast Electro-Optical Modulator to change the phase of a cw laser beam. One of the corresponding optical sidebands is selected by a filter cavity, effectively preparing an optical pulse with the desired exponential envelope and the corresponding Lorentzian spectrum. The scheme has a high on/off ratio for the optical pulses, since all the switching can be done by toggling the RF oscillator. We discuss the implementation of this scheme in free-space atom-photon interfaces.
[1] M. Stobinska, G. Alber and G. Leuchs, Euro. Phys. Lett 86, 14007
(2009)
[2] Y. Wang, L. Sheridan and V. Scarani, arXiv:1010:4661v1 (2010)