Interferometric null test of a deep parabolic reflector generating a Hertzian dipole field

Leuchs, Gerd; Mantel, Klaus; Berger, Andreas; Konermann, Hildegard; Sondermann, Markus; Peschel, Ulf; Lindlein, Norbert; Schwider, Johannes

doi:10.1364/ao.47.005570

Cited by 20 publications

(32 citation statements)

References 12 publications

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“…The lowest Rabi frequency investigated in figure 3 corresponds to a saturation parameter of 3×10 −4 . For the life time of the excited state of the cooling transition (8.1 ns) and the used detuning this corresponds to about , which is in good agreement with the expected PSF of 7.1 μm determined from simulations including the interferometrically measured aberrations of our parabolic mirror [27] (see appendix C). The average phonon number n and thus the temperature of the ion for any Ω can now be determined using these parameters.…”

Section: Methodssupporting

confidence: 85%

Measuring the temperature and heating rate of a single ion by imaging

et al. 2019

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We present a technique based on high resolution imaging to measure the absolute temperature and the heating rate of a single ion trapped at the focus of a deep parabolic mirror. We collect the fluorescence light scattered by the ion during laser cooling and image it onto a camera. Accounting for the size of the point-spread function and the magnification of the imaging system, we determine the spatial extent of the ion, from which we infer the mean phonon occupation number in the trap. Repeating such measurements and varying the power or the detuning of the cooling laser, we determine the heating rate induced by any kind of effect other than photon scattering. In contrast to other established schemes for measuring the heating rate, the ion is always maintained in a state of thermal equilibrium at temperatures close to the Doppler limit.

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Section: Methodssupporting

confidence: 85%

Measuring the temperature and heating rate of a single ion by imaging

et al. 2019

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“…For comparison also the case of a finite parabolic mirror covering roughly 94% of the solid angle is shown, a mirror geometry matching the one used in Refs. [26,39]. Choosing the area at half maximum height as the spot size yields β ≈ 0.2 in both cases.…”

Section: Attempt At a Comparison With Cavity Qedmentioning

confidence: 99%

Light–matter interaction in free space

Leuchs

Sondermann

2013

Journal of Modern Optics

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We review recent experimental advances in the field of efficient coupling of single atoms and light in free space. Furthermore, a comparison of efficient free space coupling and strong coupling in cavity quantum electrodynamics (QED) is given. Free space coupling does not allow for observing oscillatory exchange between the light field and the atom which is the characteristic feature of strong coupling in cavity QED. Like cavity QED, free space QED does, however, offer full switching of the light field, a 180° phase shift conditional on the presence of a single atom as well as 100% absorption probability of a single photon by a single atom. Furthermore, free space cavity QED comprises the interaction with a continuum of modes.

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“…The surface of the mirror exhibits deviations from a parabola. These surface deviations are measured by interferometry [28]. In general, such deviations distort the focus, leading to a reduced depth of the optical trapping potential as well as reduced curvatures of the potential.…”

Section: Experimental Realizationmentioning

confidence: 99%

Optical trapping of nanoparticles by full solid-angle focusing

Salakhutdinov

Sondermann

Carbone

et al. 2016

Optica

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Optical dipole-traps are used in various scientific fields, including classical optics, quantum optics and biophysics. Here, we propose and implement a dipole-trap for nanoparticles that is based on focusing from the full solid angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be on the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of solid-state targets. The obtained results demonstrate the feasibility of optical dipole-traps which simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.

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Interferometric null test of a deep parabolic reflector generating a Hertzian dipole field

Cited by 20 publications

References 12 publications

Measuring the temperature and heating rate of a single ion by imaging

Measuring the temperature and heating rate of a single ion by imaging

Light–matter interaction in free space

Optical trapping of nanoparticles by full solid-angle focusing

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