A status report on time scale generation in PTB

Bauch, A.; Staliuniene, Egle; Hamza, Gihan Gomah

doi:10.1109/fcs.2015.7138862

Cited by 1 publication

(2 citation statements)

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“…where m = 1..N and ℜ is used to denote the real part of an expectation value of an operator. Figure 7 shows the solution of equation (12) for N = 100 atoms with the same distribution of initial positions and momenta as used in the full model considered in the previous section. The resulting dynamics becomes much more complicated to describe, but one can see a similar behavior with the case of a single atom.…”

Section: Second-order Cumulant Expansionmentioning

confidence: 99%

“…In view of establishing a new outstanding and robust optical time and frequency standard the quest to build a continuous superradiant laser operating on a very narrow atomic transition has been the subject of intense theoretical and experimental research in the past decade [1][2][3][4][5][6][7][8][9][10]. These studies are also fueled by the remarkable operating characteristics and relative simplicity of its microwave analogue, the hydrogen maser [11,12]. Recently pulsed superradiance has been experimentally observed using laser-cooled atomic ensembles [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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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: Second-order Cumulant Expansionmentioning

confidence: 99%