An ultra-stable referenced interrogation system in the deep ultraviolet for a mercury optical lattice clock

Dawkins, S. T.; Chicireanu, Radu; Petersen, Michael; Millo, Jacques; Magalhães, Daniel Varela; Mandache, C.; Coq, Yann Le; Bize, S.

doi:10.1007/s00340-009-3830-3

Cited by 36 publications

(24 citation statements)

References 27 publications

(42 reference statements)

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“…2(a) for the relevant electronic transitions). The infrared-light (IR) is sourced from a distributed feedback semiconductor laser, injection locked with light from a fiber laser tightly locked to an ultrastable optical cavity [23]. About 1 mW of 265.6 nm light is produced by the frequency quadrupling scheme.…”

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confidence: 99%

Neutral Atom Frequency Reference in the Deep Ultraviolet withFractional Uncertainty=5.7×10−15

et al. 2012

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A neutral atom frequency reference in the deep UV with 10 −15 range uncertainty We present an assessment of the (6s 2 ) 1 S0 ↔ (6s7s) 3 P0 clock transition frequency in 199 Hg with an uncertainty reduction of nearly three orders of magnitude and demonstrate an atomic quality factor, Q, of ∼1014 . The 199 Hg atoms are confined in a vertical lattice trap with light at the newly determined magic wavelength of 362.5697±0.0011 nm and at a lattice depth of 20 ER. The atoms are loaded from a single stage magneto-optical trap with cooling light at 253.7 nm. The high Q factor is obtained with an 80 ms Rabi pulse at 265.6 nm. The frequency of the clock transition is found to be 1 128 575 290 808 162.0 ± 6.4 (sys.) ± 0.3 (stat.) Hz (fractional uncertainty = 5.7×10 −15 ). Neither an atom number nor second order Zeeman dependence have yet to be detected. Only three laser wavelengths are used for the cooling, lattice trapping, probing and detection.

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confidence: 99%

Neutral Atom Frequency Reference in the Deep Ultraviolet withFractional Uncertainty=5.7×10−15

et al. 2012

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“…Typically, lasers for such applications are stabilized by locking them to a FabryPérot cavity such that the fractional frequency stability of the laser is determined by the fractional length stability of the cavity [13][14][15][16][17][18]. Such cavity-stabilized lasers are sensitive to environmental perturbations that change the length of the cavity, including vibrations and temperature fluctuations, and much effort has gone into designing cavities that are less sensitive to accelerations [19][20][21][22] and shielding them from temperature fluctuations [23]. For applications outside the laboratory, such as clockbased geodesy [7,8], it is desirable to further reduce the sensitivity of laser frequencies to environmental perturbations.…”

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confidence: 99%

Cavity-stabilized laser with acceleration sensitivity below10−12g−1

2013

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We characterize the frequency-sensitivity of a cavity-stabilized laser to inertial forces and temperature fluctuations, and perform real-time feed-forward to correct for these sources of noise. We measure the sensitivity of the cavity to linear accelerations, rotational accelerations, and rotational velocities by rotating it about three axes with accelerometers and gyroscopes positioned around the cavity. The worst-direction linear acceleration sensitivity of the cavity is 2(1) × 10 −11 /g measured over 0-50 Hz, which is reduced by a factor of 50 to below 10 −12 /g for low-frequency accelerations by real-time feed-forward corrections of all of the aforementioned inertial forces. A similar idea is demonstrated in which laser frequency drift due to temperature fluctuations is reduced by a factor of 70 via real-time feed-forward from a temperature sensor located on the outer wall of the cavity vacuum chamber.

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“…Laser cooling on the 254 nm 1 S 0 → 3 P 1 intercombination transition was demonstrated and studied [29][30] [31]. A clock laser system with thermal noise limited instability of 4 × 10 −16 was developed [32] [33]. We performed the first direct laser spectroscopy of the the clock transition, firstly on atoms free-falling from a magneto-optic trap [34] and secondly on lattice-bound atoms, with linewidth down to 11 Hz (at 265.6 nm or 1128 THz).…”

Section: Optical Lattice Clocksmentioning

confidence: 99%

Atomic fountains and optical clocks at SYRTE: Status and perspectives

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Sarlo

et al. 2015

Comptes Rendus. Physique

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In this article, we report on the work done with the LNE-SYRTE atomic clock ensemble during the last 10 years. We cover progress made in atomic fountains and in their application to timekeeping. We also cover the development of optical lattice clocks based on strontium and on mercury. We report on tests of fundamental physical laws made with these highly accurate atomic clocks. We also report on work relevant to a future possible redefinition of the SI second. IntroductionResearch on highly accurate atomic frequency standards and their applications is making fast and steady progress. The quest for ever increased accuracy is advancing hand in hand with advances in quantum physics, with better understanding and manipulation of atomic systems, with exploration of fundamental laws of nature and with the development of important services and infrastructures for science and society. The quest for increased accuracy is also a powerful incentive to innovation in such areas as lasers, laser stabilization, low noise electronics, stable oscillators, low noise detection of optical signals, fiber devices and cold-atom based instrumentation for ground or space applications. Finally, in addition to enhancing existing applications, improved accuracy leads to new applications.This article focuses on key achievements and trends of the last 10 years. Over this period of time, the first generation of laser-cooled standards, using the atomic fountain geometry, reached maturity and had large impact on international timekeeping. The typical accuracy of these frequency standards, 2 parts in 10 16 , is now permanently accessible both locally and globally. At the same time, a new generation of optical clocks showed tremendous and steady improvement, gaining more than two orders of magnitude in a decade. To date, an accuracy of 6.4 × 10 −18 [1] was reported. Similarly, major improvements occurred in many other aspects of optical frequency metrology, notably in optical frequency combs and optical fiber links.In this article, we will report on developments of the LNE-SYRTE atomic clock ensemble since our 2004 report in the Special Issue of the Comptes Rendus de l'Académie des sciences on Fundamental Metrology [2]. This work exemplifies many of the above mentioned features of research on highly accurate atomic frequency standards. We will focus on frequency standards and their impact on timescales and timekeeping, on clock comparisons, including optical-to-microwave comparisons with combs, and their applications. Several

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An ultra-stable referenced interrogation system in the deep ultraviolet for a mercury optical lattice clock

Cited by 36 publications

References 27 publications

Neutral Atom Frequency Reference in the Deep Ultraviolet withFractional Uncertainty=5.7×10−15

Neutral Atom Frequency Reference in the Deep Ultraviolet withFractional Uncertainty=5.7×10−15

Cavity-stabilized laser with acceleration sensitivity below10−12g−1

Atomic fountains and optical clocks at SYRTE: Status and perspectives

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