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2008 IEEE International Frequency Control Symposium最新文献

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Calculation of the quantum-limited comb lineshape for a mode-locked Ti:sapphire laser 锁模钛蓝宝石激光器的量子限制梳状线形计算
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623039
J. Willits, J. Wahlstrand, S. Cundiff, C. Menyuk
{"title":"Calculation of the quantum-limited comb lineshape for a mode-locked Ti:sapphire laser","authors":"J. Willits, J. Wahlstrand, S. Cundiff, C. Menyuk","doi":"10.1109/FREQ.2008.4623039","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623039","url":null,"abstract":"We have calculated the spontaneous emission limited lineshape of the comb lines from a mode-locked Ti:sapphire laser using experimentally-derived parameters for the linear response. The lineshape has contributions from the dynamic response of the laser. Our results allow us to determine the fundamental limitation due to spontaneous emission on the uncertainty of frequency measurements using femtosecond frequency combs, when the effects of feedback and the frequency measurement equipment are properly taken into account.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132020533","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
Characteristics of dual mode AlN thin film bulk acoustic wave resonators 双模AlN薄膜体声波谐振器的特性
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623072
Qingming Chen, Fang Li, Hongbin Cheng, Qing-Ming Wang
{"title":"Characteristics of dual mode AlN thin film bulk acoustic wave resonators","authors":"Qingming Chen, Fang Li, Hongbin Cheng, Qing-Ming Wang","doi":"10.1109/FREQ.2008.4623072","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623072","url":null,"abstract":"Thin film bulk acoustic wave resonators (FBAR) using piezoelectric AlN thin films have attracted extensive research activities in the past few years. Highly c-axis oriented AlN thin films are particularly investigated for resonators operating at the fundamental thickness longitudinal mode. Depending on the processing conditions, tilted polarization (c-axis off the normal direction to the substrate surface) is often found for the as-deposited AlN thin films, which may leads to the coexistence of thickness longitudinal mode and shear mode for the thin film resonators. Knowing that the material properties are strongly crystalline orientation dependent for AlN thin films, a theoretical study is conducted to reveal the effect of tilted polarization on the frequency characteristics of thin film resonators. The input electric impedance of a thin film resonator is derived that includes both thickness longitudinal and thickness shear modes in a uniform equation. Based on the theoretical model, the effective material properties corresponding to the longitudinal and shear modes are calculated through the properties transformation between the original and new coordinate systems. The electric impedance spectra of dual mode AlN thin film resonators are calculated using appropriate materials properties and compared with experimental results. The results indicate that the frequency characteristics of thin film resonators vary with the tilted polarization angles. The coexistence of thickness longitudinal and shear modes in the thin film resonators may provide some flexibility in the design and fabrication of the FBAR devices.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134604028","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
Analysis of the Asia-Pacific TWSTFT network 亚太TWSTFT网络分析
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623047
Wen-Hung Tseng, Shinn-Yan Lin, K. Feng
{"title":"Analysis of the Asia-Pacific TWSTFT network","authors":"Wen-Hung Tseng, Shinn-Yan Lin, K. Feng","doi":"10.1109/FREQ.2008.4623047","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623047","url":null,"abstract":"Two way satellite time and frequency transfer (TWSTFT) is an important method to compare the atomic time scales between time keeping laboratories. The aim of this paper is to analyze the Asia-Pacific TWSTFT network, in which the measurements are performed synchronously by using multi-channel modems. As a result of the synchronous measurements, the clock drift and the majority path instabilities could be neutralized in the calculation of the closure links. This paper discusses what kinds of noise could be cancelled and what kinds of noise would still be kept in the result of the closure links by taking all three stations at the same time into account. From the re-examination of TWSTFT equations, we deduced that the time difference between two laboratories could be obtained via relay stations without debasing the stability in the synchronous TWSTFT measurements. The results show that the noises of the closure links in the Asia-Pacific TWSTFT network are very low. The smallest standard deviation of triangle closure is only 121 ps for the data over four months. The closing errors are closed to zero after removing calibration values. The analysis of modified Allan deviation confirms that the stability of data via relay station is in competition with the direct TWSTFT link. This paper also shows that the stability of TWSTFT could be improved by the weighted mean of the redundant TWSTFT links.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133944469","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
Analysis of inhomogeneous stress distribution in surface acoustic wave resonator 表面声波谐振器的非均匀应力分布分析
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622961
D. Hermelin, W. Daniaux, J. Garcia, S. Ballandras, B. Belgacem, M. Bruniaux
{"title":"Analysis of inhomogeneous stress distribution in surface acoustic wave resonator","authors":"D. Hermelin, W. Daniaux, J. Garcia, S. Ballandras, B. Belgacem, M. Bruniaux","doi":"10.1109/FREQ.2008.4622961","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4622961","url":null,"abstract":"This paper deals with walk-through allowing to explain the electrical response of a surface acoustic wave (SAW) resonator under inhomogeneous stress. Act of pressure on a circular membrane where is put the resonator induces inhomogeneous stress and changes the resonance frequency and the quality factor of the resonator. This paper describes a developed model allowing to explain the behavior of these two parameters.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131184649","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: 2
Nonlinear Pressure Shifts of 87Rb and 133Cs in Ar and Kr 87Rb和133c在Ar和Kr中的非线性压移
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622969
F. Gong, Y. Jau, W. Happer
{"title":"Nonlinear Pressure Shifts of 87Rb and 133Cs in Ar and Kr","authors":"F. Gong, Y. Jau, W. Happer","doi":"10.1109/FREQ.2008.4622969","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4622969","url":null,"abstract":"We demonstrated the nonlinear dependence of the microwave resonance frequencies of ground-state Rb or Cs atoms on the pressure of the buffer gases Ar and Kr. No nonlinearities were observed in the gases He or N2. These observations strongly suggest that the nonlinearities are due to the van der Waals molecules that form in Ar and Kr, but not in He or N2. We developed a simple model, parameterized by the effective three-body formation rate of molecules and by the effective product of the collisionally-limited lifetime times the shift of the hyperfine coupling coefficient in the molecule, and it explained the data very well.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"147 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133453911","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
Acoustic chemosensors for real-life environments 用于现实环境的声学化学传感器
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623033
P. Lieberzeit, A. Rehman, B. Najafi, A. Mujahid, F. L. Dickert
{"title":"Acoustic chemosensors for real-life environments","authors":"P. Lieberzeit, A. Rehman, B. Najafi, A. Mujahid, F. L. Dickert","doi":"10.1109/FREQ.2008.4623033","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623033","url":null,"abstract":"Mass-sensitive devices in combination with artificial receptors such as molecularly imprinted polymers (MIP) lead to rugged systems withstanding adverse environments. An example are titanate sol-gel materials, which can be directly exposed to automotive engine oils for incorporating oxidized base oil components. In a similar way, QCM arrays equipped with a heating coil can be utilized for operating in the head space of a composter at temperatures up to 45degC and condensing humidity.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132396240","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: 3
Detailed description of FCs1: NRC’s cesium fountain primary standard FCs1: NRC铯喷泉初级标准的详细说明
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623025
L. Marmet, B. Hoger, P. Dubé, A. Madej, J. Bernard
{"title":"Detailed description of FCs1: NRC’s cesium fountain primary standard","authors":"L. Marmet, B. Hoger, P. Dubé, A. Madej, J. Bernard","doi":"10.1109/FREQ.2008.4623025","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623025","url":null,"abstract":"The first cesium fountain primary standard built at the National Research Council Canada is described in details. Dimensional measurements and functions of components of the standard are given. We expect the standard to perform with a short term stability of 7times10-14 at one second and have a relative inaccuracy below the 1times10-15 level.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114388866","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: 10
Transient CPT signals arising from rapid changes in laser polarization 由激光偏振的快速变化引起的瞬态CPT信号
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4623082
J. Camparo, M. Huang, J. Coffer
{"title":"Transient CPT signals arising from rapid changes in laser polarization","authors":"J. Camparo, M. Huang, J. Coffer","doi":"10.1109/FREQ.2008.4623082","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4623082","url":null,"abstract":"In chip-scale atomic clocks based on coherent-population-trapping (CPT), the laser of choice is a VCSEL due to its low threshold current, very high quantum efficiency, and large dynamic bandwidth. A problem with these lasers, however, is that they suffer from polarization fluctuations, which could degrade CPT signal-to-noise ratios. In previous work we found that a rapid change in laser polarization led to a multi-exponential variation of the light intensity transmitted through a resonant Rb vapor. Here, we show that this is not a systematic effect, but is a result of atomic dynamics. Specifically, we show that the change in transmitted light intensity arises from both a change in the system's trapping state and a re-establishment of the atomic coherence that is at the heart of the CPT signal.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"321 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116438657","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
A novel, high resolution oscillator model for DES systems 一种用于DES系统的新型高分辨率振荡器模型
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622984
G. Gaderer, A. Nagy, P. Loschmidt, N. Kero
{"title":"A novel, high resolution oscillator model for DES systems","authors":"G. Gaderer, A. Nagy, P. Loschmidt, N. Kero","doi":"10.1109/FREQ.2008.4622984","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4622984","url":null,"abstract":"High accurate synchronization of clocks in environments with a high number of nodes can take advantage of modern communication networks. However, with the large number of nodes another problem arises: systems of this size cannot any more be evaluated on experimental basis. Therefore, simulation tools and models are required. These simulator models have special requirements which are outlined in this paper. Moreover, a modeling strategy is proposed and demonstrated, which can be implemented for Discrete Event Simulation tools.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122010680","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: 11
Phononic crystal sensor 声子晶体传感器
2008 IEEE International Frequency Control Symposium Pub Date : 2008-05-19 DOI: 10.1109/FREQ.2008.4622962
R. Lucklum
{"title":"Phononic crystal sensor","authors":"R. Lucklum","doi":"10.1109/FREQ.2008.4622962","DOIUrl":"https://doi.org/10.1109/FREQ.2008.4622962","url":null,"abstract":"A new acoustic microsensor principle is introduced for the first time. It is based on acoustic band gap materials, so-called phononic crystals. The sensor employs features of the band gap to determine properties of one component that builds the phononic crystal. Here the dependence of the frequency of specific resonant modes within the band gap is correlated to liquid material properties. The sensitivity to variations in speed of sound and density of the liquid confined in a small gap has been found to be much higher than achievable with traditional ultrasonic measurements.","PeriodicalId":220442,"journal":{"name":"2008 IEEE International Frequency Control Symposium","volume":"1978 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120849169","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: 26
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