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

Schäffer, Stefan A.; Christensen, Bjarke T. R.; Henriksen, Martin R.; Thomsen, J.

doi:10.1103/physreva.96.013847

Cited by 20 publications

(15 citation statements)

References 32 publications

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“…The system consists of an ensemble of cold 88 Sr atoms cooled and trapped in a 3D Magneto-Optical Trap (MOT) from a Zeeman-slowed atomic beam, using the 1 S 0 ↔ 1 P 1 transition, and was described in [22]. The atomic cloud partially overlaps with the mode of an optical cavity, and can be state manipulated by an off-axis pumping laser, see Fig.…”

Section: Experimental Systemmentioning

confidence: 99%

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Lasing on a narrow transition in a cold thermal strontium ensemble

et al. 2020

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Highly stable laser sources based on narrow atomic transitions provide a promising platform for direct generation of stable and accurate optical frequencies. Here we investigate a simple system operating in the high-temperature regime of cold atoms. The interaction between a thermal ensemble of 88 Sr at mK temperatures and a medium-finesse cavity produces strong collective coupling and facilitates high atomic coherence which causes lasing on the dipole forbidden 1 S0 ↔ 3 P1 transition. We experimentally and theoretically characterize the lasing threshold and evolution of such a system, and investigate decoherence effects in an unconfined ensemble. We model the system using a Tavis-Cummings model, and characterize velocity-dependent dynamics of the atoms as well as the dependency on the cavity-detuning.

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Section: Experimental Systemmentioning

confidence: 99%

“…The ensemble temperature is estimated from Dopplerspectroscopy, following the approach in [22], and timeof-flight measurements to be T = 5.0(5) mK. The atom number is estimated from fluorescence measurements and calibrated by comparing emitted photon number during a lasing pulse to the increase in fluorescence.…”

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confidence: 99%

Lasing on a narrow transition in a cold thermal strontium ensemble

et al. 2020

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“…The study of collective effects in atomic and molecular ensembles with cavity-mediated interactions is a very active research topic in quantum gas physics. Ongoing research focuses on the simulation and exploration of many-body systems [1][2][3][4][5] and also their application to metrology that takes advantage of the collective behavior [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Superradiant emission of a thermal atomic beam into an optical cavity

Jäger,

Liu,

Cooper

et al. 2021

Preprint

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We theoretically analyze the collective dynamics of a thermal beam of atomic dipoles that couple to a single mode when traversing an optical cavity. For this setup we derive a semiclassical model and determine the onset of superradiant emission and its stability. We derive analytical expressions for the linewidth of the emitted light and compare them with numerical simulations. In addition, we find and predict two different superradiant phases; a steady-state superradiant phase and a multicomponent superradiant phase. In the latter case we observe sidebands in the frequency spectrum that can be calculated using a stability analysis of the amplitude mode of the collective dipole. We show that both superradiant phases are robust against free-space spontaneous emission and T2 dephasing processes.

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“…Therefore, the laser frequency of the AOC will not follow the fluctuations of the cavity length exactly, but in a form of the suppressed cavity-pulling effect, and the extent of the suppression equals the bad-cavity coefficient a, where a = Γ cavity Γ gain . Since it was proposed, various types of active atomic systems have been investigated [20][21][22][23][24][25][26][27]. Recently, a superradiant pulse from the strontium clock transition with a fractional Allan deviation of 6.7(1) × 10 −16 at 1 s has been realized [27].…”

Section: Introductionmentioning

confidence: 99%

Realization of phase locking in good-bad-cavity active optical clock

Shi¹,

Pan²,

Chen³

2019

Opt. Express

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The residual cavity-pulling effect limits further narrowing of linewidth in dualwavelength (DW) good-bad-cavity active optical clocks (AOCs). In this paper, we for the first time experimentally realize the cavity-length stabilization of the 1064/1470 nm DW-AOCs by utilizing the phase locking technique of two independent 1064 nm good-cavity lasers. The frequency tracking accuracy between the two main-cavities of DW-AOCs is better than 3 × 10 −16 at 1 s, and can reach 1 × 10 −17 at 1000 s. Each 1470 nm bad-cavity laser achieves a most probable linewidth of 53 Hz, which is about a quarter of that without phase locking. The influence of the asynchronous cavity-lengths variation between two DW laser systems is suppressed.

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

Cited by 20 publications

References 32 publications

Lasing on a narrow transition in a cold thermal strontium ensemble

Lasing on a narrow transition in a cold thermal strontium ensemble

Superradiant emission of a thermal atomic beam into an optical cavity

Realization of phase locking in good-bad-cavity active optical clock

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