Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 18: Precision Spectroscopy of atoms and ions III (joint session A/Q)

Q 18.2: Vortrag

Montag, 11. März 2019, 16:45–17:00, S HS 2 Physik

High intensity laser cooling with electromagnetically induced transparency beyond the Lamb-Dicke limit — •Javier Cerrillo — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr 36 10623 Berlin

Laser techniques for ground state cooling of trapped ions, cold atoms or nanomechanical oscillators are well understood in the limit of slow cooling but lack a comprehensive description for very large laser intensities or, equivalently, beyond the well-studied Lamb-Dicke limit. The exploration of this regime has so far been uncommon due to the laser intensity limitations imposed by heating effects of carrier and blue sideband transitions. We present a scheme where coherent combination of scattering paths based on electromagnetically induced transparency (EIT) can cancel both carrier and blue-sideband excitations, so that all heating contributions vanish within the Lamb-Dicke limit. The use of multiple EIT features also facilitates simultaneous cooling of several modes and has been experimentally demonstrated. For all these schemes, a new theoretical tool based on a generalized master equation formalism is proposed for the analysis and optimization of cooling rate and final temperature which automatically incorporates polaronic and squeezing effects.