Optical frequency dissemination for metrology applications

Droste, Stefan; Udem, Thomas; Holzwarth, Ronald; Hänsch, Theodor W.

doi:10.1016/j.crhy.2015.03.011

Cited by 16 publications

(11 citation statements)

References 34 publications

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“…In particular, it enables fiber-referenced VLBI without the need for multiple hydrogen masers. Our technique does not entail absolute timing [66], in contrast to other recent fiber-based time-and-frequency transfer schemes [2][3][4][5][6][9][10][11][12][13][14][15][16][17]28,30,31,36,[42][43][44][45][46]50,55,64,70].…”

Section: E General Discussionmentioning

confidence: 99%

“…It has long been recognized [1][2][3][4][5][6] that, in order to transmit stable frequency references over long-distance optical fibers, it is essential to compensate phase perturbations due to various environmental factors. These compensation techniques are often based on returning a light signal along the optical path, then measuring and correcting for the resulting phase shift.…”

Section: Introductionmentioning

confidence: 99%

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Long-distance telecom-fiber transfer of a radio-frequency reference for radio astronomy

Baldwin

Orr

et al. 2018

Optica

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Very-long-baseline interferometry (VLBI) for high-resolution astronomical imaging requires phase-stable frequency references at widely separated radio-telescope antennas. For the first time to our knowledge, we have disseminated a suitable radio-frequency (RF) reference for VLBI over a "real-world" telecom optical-fiber link between radio telescopes that are >100 km apart, by means of an innovative phase-conjugation technique. Bidirectional optical amplification is used in parallel with live traffic, and phase perturbations in the effective optical-fiber path length are compensated. This RF-over-fiber approach obviates the need for separate hydrogen masers at each antenna, offering significant advantages for radio-astronomy facilities such as the Square Kilometer Array.

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Section: E General Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-distance telecom-fiber transfer of a radio-frequency reference for radio astronomy

Baldwin

Orr

et al. 2018

Optica

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“…In the coming decade, the ACES mission will allow groundto-space comparisons to the 10 −16 level and ground-toground comparisons to the mid 10 −17 level [3]. Optical fiber links will allow comparisons of the most accurate optical clocks at their limit: 10 −18 or better [6,7]. We can confidently predict major improvements in all applications of highly accurate atomic clocks.…”

Section: Prospectsmentioning

confidence: 99%

“…Several * sebastien.bize@obspm.fr other aspects of our research are covered by other articles of the Special Issue of the Comptes Rendus de l'Académie des Sciences (Volume 16, Issue 5), i.e. the space mission PHARAO/ACES [3], fundamental tests with clocks [4], development of technologies for space optical clocks [5] and optical fibers links [6,7].…”

Section: Introductionmentioning

confidence: 99%

Atomic fountains and optical clocks at SYRTE: Status and perspectives

Abgrall

Chupin

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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“…Laser sources with ultranarrow (less than 1 Hz) spectral linewidths are of great importance in precision measurement science. Its applications include gravitational waves detection [1], search for dark matter [2] and drift of fundamental constants [3], dissemination of ultrastable time and frequency signals [4]. Ultrastable lasers are the vital parts of state-of-art frequency standards -optical clocks, whose instability and systematic uncertainty have reached values below 10 -18 [5,6].…”

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confidence: 99%