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Q: Quantenoptik
Q 313: Quanteneffekte I
Q 313.7: Talk
Wednesday, March 6, 2002, 15:45–16:00, HS 01/E02
Interference Experiments with Trapped Ba+ Ions — •Pavel Bouchev, Alex Wilson, Jürgen Eschner, and Rainer Blatt — Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Österreich
Both the driven micromotion and the thermal (secular) motion of a single trapped 138Ba+ ion have been observed as sidebands in the 493 nm S-P Doppler-cooling fluorescence using a heterodyne technique [1]. The feasibility of using electronic feedback to reduce the ion’s motion via detection of the secular sidebands is to be explored. The apparatus has also been used to observe modified spontaneous emission by interaction of a single trapped ion with its own resonance fluorescence retro-reflected from a single mirror. The closely related but distinct phenomenum of enhanced and suppressed collective spontaneous emission (Dicke’s super- and subradiance) has also been observed with two trapped Ba+ ions [2]. Upon translation of the mirror using a piezo actuator these processes manifest themselves as interference fringes in the ‘repumper’ and 493 nm fluorescence signals respectively. Extensions of this work will be presented, including the coupling of a fundamental light source, a single fluorescing ion, to a single-mode optical fibre.
[1] Ch. Raab et al., Phys. Rev. Lett. 85, 538 (2000)
[2] J. Eschner et al., Nature 413, 495 (2001)