Direct Laser Cooling Al${}^{+}$ Ion Optical Clocks

Zhang, Jie; Deng, Ke; Luo, Jun; Lu, Zehuang

doi:10.1088/0256-307x/34/5/050601

Cited by 14 publications

(12 citation statements)

References 63 publications

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“…Using these clocks, the first optical-clock-based laboratory measurement of the dependence of the gravitational red shift on a change in the height difference has been performed 36 . Since then, a number of groups have started new Al + clock setups [37][38][39] , including our own at PTB 40,41 .…”

Section: Introductionmentioning

confidence: 99%

Towards a transportable aluminium ion quantum logic optical clock

Hannig

Pelzer

Scharnhorst

et al. 2019

Review of Scientific Instruments

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With the advent of optical clocks featuring fractional frequency uncertainties on the order of 10 −17 and below, new applications such as chronometric levelling with few-cm height resolution emerge. We are developing a transportable optical clock based on a single trapped aluminium ion, which is interrogated via quantum logic spectroscopy. We employ singlycharged calcium as the logic ion for sympathetic cooling, state preparation and readout.Here we present a simple and compact physics and laser package for manipulation of 40 Ca + . Important features are a segmented multi-layer trap with separate loading and probing zones, a compact titanium vacuum chamber, a near-diffraction-limited imaging system with high numerical aperture based on a single biaspheric lens, and an all-in-fiber 40 Ca + repump laser system. We present preliminary estimates of the trap-induced frequency shifts on 27 Al + , derived from measurements with a single calcium ion. The micromotion-induced secondorder Doppler shift for 27 Al + has been determined to be δνEMM ν = −0.4 +0.4 −0.3 × 10 −18 and the black-body radiation shift is δν BBR /ν = (−4.0±0.4)×10 −18 . Moreover, heating rates of 30 (7) quanta per second at trap frequencies of ω rad,Ca+ ≈ 2π × 2.5 MHz (ω ax,Ca+ ≈ 2π × 1.5 MHz) in radial (axial) direction have been measured, enabling interrogation times of a few hundreds of milliseconds.

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Section: Introductionmentioning

confidence: 99%

Towards a transportable aluminium ion quantum logic optical clock

Hannig

Pelzer

Scharnhorst

et al. 2019

Review of Scientific Instruments

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“…The UV laser spectroscopy of aluminum atoms is also important for resonanceenhanced photoionization of aluminum atoms, which will serve as a high efficiency, low contamination way to load aluminum ions for Al + ion optical clocks [11]. Al + ion optical clocks have low sensitivity to electromagnetic perturbations, narrow natural linewidth [12] and the smallest sensitivity to blackbody radiation [13].…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet laser spectroscopy of aluminum atoms in hollow-cathode lamp

Liu

Yuan

Cheng

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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We report precision measurement of aluminum atoms 2 P 1/2 − 2 S 1/2 transition at 394 nm and 2 P 3/2 − 2 S 1/2 transition at 396 nm in a hollow-cathode lamp (HCL). Both absorption spectroscopy and saturated absorption spectroscopy (SAS) are performed. From the absorption spectroscopy the Doppler linewidth is estimated to be 2.6 GHz. The SAS spectroscopy is analyzed based on the velocitychanging-effect model. With a frequency comb calibrated wavemeter, the frequencies of 2 P 1/2 , F = 3 − 2 S 1/2 , F = 2 transition and 2 P 3/2 , F = 4 − 2 S 1/2 , F = 3 transition are measured to be 759.905401(10) THz and 756.547403(10) THz, respectively. The hyperfine structure constants of aluminum atoms are determined and compared with previously reported measurement results and theoretical calculation. Reasonable agreement is found for the magnetic dipole constant (A constant), while the electric quadrupole constant (B constant) has a large deviation.

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“…В-третьих, более низкая стабильность ионных ча-сов на коротких временах усреднения (по сравне-нию с часами на нейтральных атомах) не явля-ется ограничением при проектировании БСУ для навигационного спутника. Из недостатков можно перечислить высокую чувствительность к электри-ческим полям (требуется деликатное управление потенциалами на электродах), относительно низ-кий уровень сигнала люминесценции от одиночно-го иона и труднодоступность ультрафиолетовых пе-реходов в некоторых ионах [28,29].…”

Section: Introductionunclassified