Continuous outcoupling of ultracold strontium atoms combining three different traps

Takeuchi, Ryoto; Chiba, Hayaki; Okaba, Shoichi; Takamoto, Masao; Tsuji, Shintaro; Katori, Hidetoshi

doi:10.35848/1882-0786/accb3c

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…One straightforward approach which is currently pursued is based on a continuous ultracold beam of excited atoms passing through an optical resonator [2,7,[18][19][20][21][22][23]. In the past years, considerable progress has been made in this direction, yet the main challenge is to create a sufficient inverted atomic flux needed for collective superradiant emission.…”

Section: Introductionmentioning

confidence: 99%

A superradiant two-level laser with intrinsic light force generated gain

Bychek,

Ritsch

2023

New J. Phys.

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The implementation of a superradiant laser as an active frequency standard is predicted to provide better short-term stability and robustness to thermal and mechanical fluctuations when compared to standard passive optical clocks. However, despite significant recent progress, the experimental realization of continuous wave superradiant lasing still remains an open challenge as it requires continuous loading, cooling, and pumping of active atoms within an optical resonator. Here we propose a new scenario for creating continuous gain by using optical forces acting on the states of a two-level atom via bichromatic coherent pumping of a cold atomic gas trapped inside a single-mode cavity. Analogous to atomic maser setups, tailored state-dependent forces are used to gather and concentrate excited state atoms in regions of strong atom-cavity coupling while ground-state atoms are repelled. To facilitate numerical simulations of a sufficiently large atomic ensemble, we rely on a second-order cumulant expansion and describe the atomic motion in a semi-classical point-particle approximation subject to position-dependent light shifts which induce optical gradient forces along the cavity axis. We study minimal conditions on pump laser intensities and detunings required for collective superradiant emission. Balancing Doppler cooling and gain-induced heating we identify a parameter regime of a continuous narrow-band laser operation close to the bare atomic frequency.

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Section: Introductionmentioning

confidence: 99%

A superradiant two-level laser with intrinsic light force generated gain

Bychek,

Ritsch

2023

New J. Phys.

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“…The use of atomic quantum properties and characteristics is currently the most reliable approach to developing the highest precision set of metrological standards. Time-frequency standards, based on neutral atoms, represent the most spectacular examples of metrological standards with record fractional uncertainties below 10 −18 , continuously attracting significant attention from researchers [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Precision Spectroscopy of Radiation Transitions between Singlet Rydberg States of the Group IIb and Yb Atoms

Glukhov,

Kamenski,

Ovsiannikov

et al. 2023

Photonics

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The measurements of microwave (μw) and radio-frequency (RF) radiation quantitative parameters may be based on the quantum–optical approach to determine the spectral characteristics of radiation transitions between the Rydberg states of atoms. Frequencies and matrix elements are calculated for dipole transitions between opposite-parity Rydberg states n1LL and n′1L±1L±1 (where n′=n,n±1,n±2) of the singlet series in the alkaline–earth–metal-like atoms of group IIb (Zn, Cd, Hg) and Yb. The matrix elements determine the shifts of Rydberg-state energy levels in the field of resonance μw or RF radiation, splitting the resonance of electromagnetically induced transparency (EIT) for intensely absorbed probe radiation. Numerical computations based on the single-electron quantum defect method (QDM) and the Fues’ model potential (FMP) approach with the use of the most reliable data from the current literature on quantum defect values are performed for frequencies and matrix elements of transitions between singlet Rydberg states of 1S0-, 1P1-, 1D2-, and 1F3-series in Zn, Cd, Hg, and Yb atoms. The calculated data are approximated by polynomials in the powers of the principal quantum numbers. The polynomial coefficients are determined with the use of a standard curve-fitting interpolation polynomial procedure for numerically calculated functions. These approximation expressions provide new possibilities for accurately evaluating the frequencies and matrix elements of dipole transitions between Rydberg states over a wide range of quantum numbers n >> 1, accompanied by the emission and absorption of μw and RF photons.

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