Towards passive and active laser stabilization using cavity-enhanced atomic interaction

Schäffer, Stefan A.; Christensen, Bjarke Bak; Rathmann, Sven; Appel, Martin Hayhurst; Henriksen, Martin R.; Thomsen, J.

doi:10.1088/1742-6596/810/1/012002

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…Here, For linearly polarized light, the above expression can be conveniently represented in terms of rank 0 and 2 tensors as [26,28,32]…”

Section: Methods Of Evaluationmentioning

confidence: 99%

“…The laser induced light shifts can be avoided by trapping the atoms in optical lattice at the magic wavelength (λ magic ) [22][23][24]. This is a well known technique used in passive atomic clocks [25][26][27][28] where the magic wavelength trapping is constructed for a ground state and an excited state. Theoretical determination of magic wavelengths in these atoms involves calculation of frequency-dependent polarizabilities of the considered states to find the magic wavelengths, where dynamic polarizability of both states participating in the transition is equal, in other words, the differential Stark shift for the states involved in the transition is zero [24].…”

Section: Introductionmentioning

confidence: 99%

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Magic Wavelengths for Optical-Lattice Based Cs and Rb Active Clocks

Singh

Jyoti

Sahoo

et al. 2020

Atoms

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Active clocks could provide better stabilities during initial stages of measurements over passive clocks, in which stabilities become saturated only after long-term measurements. This unique feature of an active clock has led to search for suitable candidates to construct such clocks. The other challenging task of an atomic clock is to reduce its possible systematics. A major part of the optical lattice atomic clocks based on neutral atoms are reduced by trapping atoms at the magic wavelengths of the optical lattice lasers. Keeping this in mind, we find the magic wavelengths between all possible hyperfine levels of the transitions in Rb and Cs atoms that were earlier considered to be suitable for making optical active clocks. To validate the results, we give the static dipole polarizabilities of Rb and Cs atoms using the electric dipole transition amplitudes that are used to evaluate the dynamic dipole polarizabilities and compare them with the available literature values.

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“…Here, For linearly polarized light, the above expression can be conveniently represented in terms of rank 0 and 2 tensors as [26,28,32]…”

Section: Methods Of Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magic Wavelengths for Optical-Lattice Based Cs and Rb Active Clocks

Singh

Jyoti

Sahoo

et al. 2020

Atoms

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“…Through laser cooling technique, the Doppler effect can be largely suppressed. The Niels Bohr Institute at the University of Copenhagen has chosen 88 Sr atoms as a quantum reference for laser frequency stabilization based on cavityenhanced atomic interaction, using both passive and active methods [73]. In the passive scheme [74,75], a cavityenhanced modulation transfer spectrum is employed and the corresponding atomic phase shift is used as an error signal.…”

Section: Atomic Beam Two-level Aocmentioning

confidence: 99%

The development of active optical clock

et al. 2023

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The atomic clocks, whether operating at optical or microwave region, can be divided into two categories according to their working mode, namely the passive clocks and active clocks. The passive clocks, whose standard frequency is locked to an ultra-narrow atomic spectral line, such as laser cooled Cs beam or lattice trapped Sr atoms, depend on the spontaneous emission line. On the contrary, the active clocks, in which the atoms are used as the gain medium, are based on the stimulated emission radiation, their spectrum can be directly used as the frequency standard. Up to now, the active hydrogen maser has been the most stable microwave atomic clocks. Also, the Sr superradiant active atomic clock is prospects for a millihertz-linewidth laser. Moreover, the optical clocks are expected to surpass the performance of microwave clocks both in stability and uncertainty, since their higher working frequency. The active optical clock has the potential to improve the stability of the best clocks by 2 orders of magnitude. In this work, we introduce the development of active optical clocks, and their types is classified according to the energy-level structure of atoms for stimulated radiation.

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“…By exploiting the high Q factor of the atomic transitions and using cavities with comparatively low Q factors the systems are far less sensitive to thermal fluctuations of the cavity components, and the experimental requirements are simplified. In these approaches active as well as passive atomic systems have been suggested [13][14][15][16][17][18]. The active atomic systems are optical equivalents of the maser, relying on cooperative quantum phenomena such as superradiance or superfluorescence of atoms inside the cavity mode.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of bad-cavity-enhanced interaction with cold Sr atoms for laser stabilization

et al. 2017

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Hybrid systems of cold atoms and optical cavities are promising systems for increasing the stability of laser oscillators used in quantum metrology and atomic clocks. In this paper we map out the atom-cavity dynamics in such a system and demonstrate limitations as well as robustness of the approach. We investigate the phase response of an ensemble of cold 88 Sr atoms inside an optical cavity for use as an error signal in laser frequency stabilization. With this system we realize a regime where the high atomic phase shift limits the dynamical locking range. The limitation is caused by the cavity transfer function relating input field to output field. The cavity dynamics is shown to have only little influence on the prospects for laser stabilization, making the system robust towards cavity fluctuations and ideal for the improvement of future narrow linewidth lasers.

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Towards passive and active laser stabilization using cavity-enhanced atomic interaction

Cited by 5 publications

References 17 publications

Magic Wavelengths for Optical-Lattice Based Cs and Rb Active Clocks

Magic Wavelengths for Optical-Lattice Based Cs and Rb Active Clocks

The development of active optical clock

Dynamics of bad-cavity-enhanced interaction with cold Sr atoms for laser stabilization

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