2014 European Frequency and Time Forum (EFTF)最新文献_第9页

Active electronic cancellation of nonlinearity in a High-Q longitudinal-mode silicon resonator by current biasing 基于电流偏置的高q纵模硅谐振器非线性有源电子抵消

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331415

Haoshen Zhu, Cheng Tu, Joshua E-Y Lee, L. Rufer

引用次数: 4

On the single-state selection for H-maser and its signal application for fountain atomic standard h脉泽单态选择及其在喷泉原子标准中的信号应用

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331456

M. Aleynikov, A. Boyko

{"title":"On the single-state selection for H-maser and its signal application for fountain atomic standard","authors":"M. Aleynikov, A. Boyko","doi":"10.1109/EFTF.2014.7331456","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331456","url":null,"abstract":"It is well known one of the way to ensure a presence only operating atoms in the storage bulb is a method associated with Majorana transition. To implement this method a magnetic field created by two Pseudo-Helmholtz coils, that are placed at the region between state selection magnets, is used. With this shape of the total field in mind it is extremely important to know transverse (in regard to the atomic beam axis) coordinates of the region where the field change its sign, and the magnitude of the field gradient in this region. In the paper the dependences of H-maser's selection state system quality factor on the value of the magnetic field gradient and on the transverse coordinate of its zero value are calculated and examined. The extreme values of this parameters when a single-state selection does not work are defined. Moreover, the hydrogen beam intensity is a intrinsic value for Power Spectral Density of the H-maser's output signal. In the second part of the paper a principal circuit for using the output signal to create interrogation waveform (a synthesizer) for Rb atomic fountain is discussed, quantity of the Dick effect is calculated. It is shown achievable fountain's stability due to a technical noise of such RF synthesizer can reach 6·10-14 for 1 sec.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127995333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331419

S. Galliou, P. Abbé, R. Bourquin, M. Goryachev, M. Tobar, E. Ivanov

{"title":"Properties related to Q-factors and noise of quartz resonator-based systems at 4K","authors":"S. Galliou, P. Abbé, R. Bourquin, M. Goryachev, M. Tobar, E. Ivanov","doi":"10.1109/EFTF.2014.7331419","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331419","url":null,"abstract":"It has been shown recently that premium grade quartz crystal resonators can exhibit outstanding quality-factors, Q, greater than 1 billion at liquid helium temperatures. It is demonstrated that at low temperatures interaction between acoustic and thermal phonons is governed by the Landau-Rumer theory predicting Q = const scaling law. This regime is distinct from the known Akhieser regime giving Q × f = const typically observed at room temperature. As a consequence, at low temperatures, the intrinsic Q-factor is independent of the resonant frequency making it advantageous to operate on higher overtones than the usual third or fifth overtones. Nevertheless, other loss mechanisms, such as surface or bulk scattering, can limit resonator performance, as discussed in the paper. In addition, experiment also shows that the frequency flicker noise of acoustic devices is inversely proportional to Qn, where n is close to 4, at the corresponding frequency. It emerges from both previous points, i.e. the improvement of Q-factors at low temperature in one hand and noise related to the Q-factor in the other hand, that high frequency stabilities should be expected from quartz resonator-based frequency sources operating at cryogenic temperatures. Noise measurements of resonators cooled by means of a pulse-tube cryogenerator, have then been performed. Power spectral densities of fractional frequency in the order of Sy(f = 1Hz) = 1 10-28 at 4 K have been achieved, that is to say two orders of magnitude lower than values already published. Resulting noise are described, and further promising applications are discussed.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131804086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

The light and orientation end resonance frequency shifts in alkaline atoms vapors 在碱性原子蒸气中，光和取向端共振频率发生移位

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331455

A. Baranov, S. Ermak, V. Semenov

引用次数: 0

Quantum cascade laser at Hz-level by use of a frequency comb and an optical link 使用频率梳和光链路的hz级量子级联激光器

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331469

B. Argence, B. Chanteau, O. Lopez, C. Chardonnet, C. Daussy, B. Darquié, A. Amy-Klein, D. Nicolodi, M. Abgrall, Y. Le Coq

引用次数: 1

Digital implementation of a two-way coherent phase transfer over optical fiber for remote clocks comparisons 用于远程时钟比较的光纤双向相干相位转移的数字实现

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331501

C. Calosso, E. Bertacco, D. Calonico, C. Clivati, G. Costanzo, M. Frittelli, F. Levi, S. Micalizio, A. Mura, A. Godone

引用次数: 0

The concept of differential wavelength stabilization of the semiconductor lasers for time and frequency transfer system 时频传递系统中半导体激光器差分波长稳定的概念

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331495

L. Buczek

引用次数: 0

STW resonator on (0°, 22°, 90°) cut of langasite with Al electrodes STW谐振器在(0°，22°，90°)切割的菱叶石与铝电极

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331483

A. Galisultanov, V. Kalinin, S. Volynkin, V. Plessky

{"title":"STW resonator on (0°, 22°, 90°) cut of langasite with Al electrodes","authors":"A. Galisultanov, V. Kalinin, S. Volynkin, V. Plessky","doi":"10.1109/EFTF.2014.7331483","DOIUrl":"https://doi.org/10.1109/EFTF.2014.7331483","url":null,"abstract":"In this paper we present the measurement results for surface transverse wave (STW) resonators on langasite (0°, 22°, 90°) with aluminum electrodes. This STW cut of langasite provides temperature stable delay of STW with high coupling coefficient and potentially provide better Q-factor than standard SAW resonators, since pure shear vibrations in STW result in less loss than those of Rayleigh type waves with compression components. We fabricated resonators with wavelength (2p) of 6μm, 7.2μm, and 9 μm; m/p = 0.5; W = 400p, NIDT=130, Nr=400. The thickness of aluminum hAl = 288 nm. The experimentally obtained values of Q-factor <;3000 were lower than expected and required explanation. Since the shear wave velocity in this cut of langasite is smaller than the corresponding BAW velocity in aluminum, the aluminum electrodes accelerate waves. The Bragg reflection, on the other hand, creates “stop-bands,” on the left edge of which the phase velocity of the wave decreases. That is, the surface wave exists only because of the Bragg stopband phenomenon. In the case of a uniform Al layer there is no localized near-surface shear wave (no Love wave with Al layer on LGS) and energy is lost in the direction of the busbars, thereby reducing the quality factor.","PeriodicalId":129873,"journal":{"name":"2014 European Frequency and Time Forum (EFTF)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127361097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromagnetic induction readout silicon-on-insulator MEMS resonant magnetometer 电磁感应读出绝缘体上硅MEMS谐振磁强计

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331417

Weiguan Zhang, Joshua E-Y Lee

引用次数: 0

Noise performance optimization of time and frequency dissemination system in presence of fiber mechanical vibrations 光纤机械振动时频传播系统的噪声性能优化

2014 European Frequency and Time Forum (EFTF) Pub Date : 2014-06-23 DOI: 10.1109/EFTF.2014.7331503

J. Kołodziej, P. Krehlik, L. Sliwczynski, W. Slowik, P. Kalabiński

引用次数: 1