Mechanical effects of light in optical resonators

Domokos, P.; Ritsch, Helmut

doi:10.1364/josab.20.001098

Cited by 183 publications

(241 citation statements)

References 63 publications

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“…We denote the mechanism by cavity-assisted EIT (CEIT) cooling. The cooling at δ PC 0, instead, is based on the excitation of the red sideband of the cavity-like dressed state |+ [22,34]. Here, in the limit of large |δ PL |, the control laser acts like an incoherent repumper that transfers atoms that decay into state |g 1 back to state |g 2 (Color online) Microwave sideband spectra of EIT-cooled (blue) and molasses-cooled (black) atoms in the standing-wave dipole trap.…”

Section: Measurementsmentioning

confidence: 99%

Electromagnetically-induced-transparency control of single-atom motion in an optical cavity

et al. 2014

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We demonstrate cooling of the motion of a single neutral atom confined by a dipole trap inside a high-finesse optical resonator. Cooling of the vibrational motion results from EIT-like interference in an atomic Λ-type configuration, where one transition is strongly coupled to the cavity mode and the other is driven by an external control laser. Good qualitative agreement with the theoretical predictions is found for the explored parameter ranges. Further we demonstrate EIT-cooling of atoms in the dipole trap in free space, reaching the ground state of axial motion. By means of a direct comparison with the cooling inside the resonator, the role of the cavity becomes evident by an additional cooling resonance. These results pave the way towards a controlled interaction between atomic, photonic and mechanical degrees of freedom.

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Section: Measurementsmentioning

confidence: 99%

Electromagnetically-induced-transparency control of single-atom motion in an optical cavity

et al. 2014

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“…Indeed, the coupling between resonator and atom gives rise to complex dynamics, one aspect of which is the substantial modification of the atom spectroscopic properties [1]. This property allows one to change the atom scattering cross section, thereby affecting, and eventually tailoring, the mechanical dynamics of the atomic center of mass [2]. Moreover, the motion of the atom changes the medium density, thereby affecting the resonator field itself.…”

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confidence: 99%

Cooling Trapped Atoms in Optical Resonators

2005

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We derive an equation for the cooling dynamics of the quantum motion of an atom trapped by an external potential inside an optical resonator. This equation has broad validity and allows us to identify novel regimes where the motion can be efficiently cooled to the potential ground state. Our result shows that the motion is critically affected by quantum correlations induced by the mechanical coupling with the resonator, which may lead to selective suppression of certain transitions for the appropriate parameters regimes, thereby increasing the cooling efficiency. DOI: 10.1103/PhysRevLett.95.143001 PACS numbers: 32.80.Pj, 32.80.Lg, 42.50.Pq Cavity cooling is a recent expression, which stresses the role of the mechanical effects of a resonator on the atomic and molecular center-of-mass dynamics. Indeed, the coupling between resonator and atom gives rise to complex dynamics, one aspect of which is the substantial modification of the atom spectroscopic properties [1]. This property allows one to change the atom scattering cross section, thereby affecting, and eventually tailoring, the mechanical dynamics of the atomic center of mass [2]. Moreover, the motion of the atom changes the medium density, thereby affecting the resonator field itself. Several recent experiments have reported relevant features of these complex dynamics [3][4][5][6][7][8]. Experimental demonstrations of atom cooling in resonators [3][4][5][6][7] have shown, among others, that cavities are a promising tool for preparing and controlling cold atomic samples of scalable dimensions, which may find relevant applications, for instance, in quantum information processing [9].In this Letter, we present a study of the quantum dynamics of the center-of-mass motion of an atomic dipole, which couples to a resonator and to a laser field driving it from the side. The system is sketched in Fig. 1. Differently from recent theoretical works on cavity cooling of atomic clouds [10], here the center of mass is confined by a tight trap, in a configuration that may correspond to the experimental situations reported, for instance, in [4,11,12]. Starting from a master equation for the quantum variables of the dipole, cavity, and center of mass, we derive a closed equation for the center-of-mass dynamics. This equation generalizes previous theoretical studies [13,14] and allows us to identify novel parameter regimes, where cooling can be efficient. Moreover, its form permits us to identify the individual scattering contributions, thereby gaining insight into the role of the various physical parameters. We show that quantum correlations between atom and resonator may lead to the suppression of scattering transitions, thereby enhancing the cooling efficiency.The starting point is the master equation for an atom of mass M whose dipole transition between the ground and excited states jgi and jei couples (quasi)resonantly to a laser and the mode of an optical resonator with wave vector k L and k c , respectively (jk L j jk c j k). In the reference frame of the laser, the...

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“…1 and 2 which has already been studied by many authors [27,28,35,36,[39][40][41][42][43][44][45][46][47]. Analogously to ordinary laser cooling [48][49][50], the effective cooling rate of cavity-mediated laser cooling scales as the Lamb-Dicke parameter η squared.…”

Section: Introductionmentioning

confidence: 94%

“…Subsequently, this approach has been used by many authors [39][40][41][42][43], since the precision of its calculations is easier to control than the precision of semiclassical calculations. Moreover, cavity-mediated cooling is especially then of practical interest when it allows particles to be cooled to very low temperatures, where quantum effects dominate the time evolution of the system and semiclassical models no longer apply [28].…”

Section: Introductionmentioning

confidence: 99%

Rate-equation approach to cavity-mediated laser cooling

Blake¹,

Kurcz²,

Beige³

2012

Phys. Rev. A

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The cooling rate for cavity-mediated laser cooling scales as the Lamb-Dicke parameter η squared. A proper analysis of the cooling process hence needs to take terms up to η 2 in the system dynamics into account. In this paper, we present such an analysis for a standard scenario of cavity-mediated laser cooling with η 1. Our results confirm that there are many similarities between ordinary and cavity-mediated laser cooling. However, for a weakly confined particle inside a strongly coupled cavity, which is the most interesting case for the cooling of molecules, numerical results indicate that more detailed calculations are needed to model the cooling process accurately.

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Mechanical effects of light in optical resonators

Cited by 183 publications

References 63 publications

Electromagnetically-induced-transparency control of single-atom motion in an optical cavity

Electromagnetically-induced-transparency control of single-atom motion in an optical cavity

Cooling Trapped Atoms in Optical Resonators

Rate-equation approach to cavity-mediated laser cooling

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