时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138962

Songbai Kang, M. Gharavipour, F. Gruet, C. Affolderbach, G. Mileti

{"title":"Compact and high-performance Rb clock based on pulsed optical pumping for industrial application","authors":"Songbai Kang, M. Gharavipour, F. Gruet, C. Affolderbach, G. Mileti","doi":"10.1109/FCS.2015.7138962","DOIUrl":"https://doi.org/10.1109/FCS.2015.7138962","url":null,"abstract":"We report on the development of a compact laserpumped Rb clock based on the pulsed optical pumping (POP) technique, in view of future industrial applications. The clock Physics Package (PP) is based on a compact magnetron-type microwave cavity of 45 cm3 volume, and our current clock PP has a volume of only 0.8 liters, including temperature control and magnetic shields. This clock PP is completed by a newlydeveloped frequency-stabilized laser head of 2.5 liters overall volume, with an acoustic optical modulator (AOM) integrated within the laser head for switching the laser output power. Due to the highly uniform magnetic field inside the microwave cavity, Ramsey signals with high contrast of up to 35% and with a linewidth of 160 Hz have been demonstrated. A typical shortterm clock stability of 2.4×10-13τ-1/2 is measured. Thanks to the pulsed operation, the light-shift effect has been considerably suppressed as compared to previously demonstrated continuous-wave (CW) clock operation using the same clock PP, which is expected to enable improved long-term clock stabilities down to the 10-14 level or better.","PeriodicalId":57667,"journal":{"name":"时间频率公报","volume":"38 1","pages":"800-803"},"PeriodicalIF":0.0,"publicationDate":"2015-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81544035","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: 6

GNSS RAFS latest improvements GNSS RAFS的最新改进

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138926

Droz Fabien, R. Pascal, Boillat Sebastien, S. Batiste

引用次数: 4

Laser stabilization on velocity dependent nonlinear dispersion of Sr atoms in an optical cavity 光学腔中Sr原子速度相关非线性色散的激光稳定

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138858

B. R. Christensen, S. A. Schaffer, M. R. Henriksen, P. Westergaard, Jun Ye, J. Thomsen

{"title":"Laser stabilization on velocity dependent nonlinear dispersion of Sr atoms in an optical cavity","authors":"B. R. Christensen, S. A. Schaffer, M. R. Henriksen, P. Westergaard, Jun Ye, J. Thomsen","doi":"10.1109/FCS.2015.7138858","DOIUrl":"https://doi.org/10.1109/FCS.2015.7138858","url":null,"abstract":"The development of simple and reliable high stability clock lasers is of great importance for future state-of-the-art optical clocks [1]-[5] and for future transportable optical clocks [6], [7]. Further development of clock lasers with better stability has so far been hindered by thermal noise in the reference cavity used for laser stabilization and conventional approaches for improvements may be technically challenging. It has been proposed [8]-[11] to improve the stability and reduce the complexity of state-of-the-art laser frequency stabilization by exploiting cavity QED systems consisting of atoms with a narrow optical transition coupled to a single mode of an optical cavity. The laser stabilization performance of a cavity QED system is affected by a number of system parameters such as the finite temperature of the atoms, the number of involved atoms and the laser power [12]-[14]. However, the dynamics of those elements have not yet been fully explored. Here we present a simple cavity QED system consisting of laser cooled strontium-88 atoms coupled to an optical cavity. We relate measurable quantities to the complex transmission coefficient which relates the input field to the output field. The optimal input power for stabilizing a laser to this system is experimentally determined and the optimal shot-noise-limited linewidth of the system is evaluated to 500 mHz. Furthermore, theoretical shot-noise-limited linewidths of similar cavity QED systems are evaluated for a number of different two electron systems.","PeriodicalId":57667,"journal":{"name":"时间频率公报","volume":"23 1","pages":"357-362"},"PeriodicalIF":0.0,"publicationDate":"2015-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80632608","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: 1

A 250nm CMOS low phase noise differential VCO circuit without varactors 一种250nm无变容管的CMOS低相位噪声差分压控电路

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138808

A. Kosykh, K. V. Murasov, A. Lepetaev, S. Zavyalov

引用次数: 0

Hardware implementation aspects of Multi-Step Look-Ahead Σ-Δ modulation-like architectures for all-digital frequency synthesis applications 面向全数字频率合成应用的多步前瞻Σ-Δ类调制架构的硬件实现方面

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138880

Charis Basetas, A. Kanteres, P. Sotiriadis

引用次数: 3

Interrogation of orthogonal frequency coded SAW sensors using the USRP 基于USRP的正交频率编码SAW传感器的研究

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138900

J. Humphries, M. Gallagher, D. Gallagher, A. Weeks, D. Malocha

{"title":"Interrogation of orthogonal frequency coded SAW sensors using the USRP","authors":"J. Humphries, M. Gallagher, D. Gallagher, A. Weeks, D. Malocha","doi":"10.1109/FCS.2015.7138900","DOIUrl":"https://doi.org/10.1109/FCS.2015.7138900","url":null,"abstract":"The universal software radio peripheral (USRP) is a versatile software defined radio (SDR) platform, developed by Ettus Research™, which is intended for a wide variety of applications ranging from communication links to RADAR. We have investigated another application of the USRP by implementing a transceiver capable of interrogating passive, wireless surface acoustic wave (SAW) sensors centered at 915MHz. Interrogation of wideband orthogonal frequency coded (OFC) SAW sensors imposes strict requirements on the timing and synchronization of the transceiver. In the standard mode of operation, samples are generated and streamed between the USRP and host computer, introducing latency and bandwidth limitations due to the sampling bus. To achieve the performance required for this application, the USRP FPGA has been modified to introduce new functionality. Extraction of the sensor temperature is accomplished with a custom matched filter correlator. The system is capable of interrogating multiple sensors and can quickly reconfigure the USRP. Demonstration of the USRP wireless sensor system is achieved by interrogating wireless SAW OFC sensors at 915MHz and extracting the sensor temperature.","PeriodicalId":57667,"journal":{"name":"时间频率公报","volume":"34 8","pages":"530-535"},"PeriodicalIF":0.0,"publicationDate":"2015-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/FCS.2015.7138900","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72475996","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: 7

Correction for code-phase clock bias in PPP PPP中码相时钟偏差的校正

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138930

P. Defraigne, J. Sleewaegen

引用次数: 4

Frequency signal source's PN (phase noise) measurements: Challenges and uncertainty 频率信号源的PN(相位噪声)测量:挑战和不确定性

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138792

U. Rohde, A. Poddar, E. Rubiola, M. Silaghi

引用次数: 0

The method of determination of GEO satellite precise clock bias during maneuvering GEO卫星机动时精确时钟偏差的确定方法

时间频率公报 Pub Date : 2015-04-12 DOI: 10.1109/FCS.2015.7138914

Meifang Wu, Pei Wei, Xuhai Yang, Shou-gang Zhang