Microwave leakage shift suppression based on home made DDS

Lin, Pingwei; Shi, Liu; Liu, Nianfeng

doi:10.1109/freq.2009.5168349

Cited by 3 publications

(2 citation statements)

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“…For CSF2 the Ramsey cavity microwaves are instead frequency detuned when the atoms are outside the Ramsey cavity [68,69]. The DDS in the microwave synthesizer (see section 2.3) phase-continuously steps the frequency by about 390 kHz and additional phase synchronization preserves the phase of the interrogating microwaves [31].…”

Section: Microwave Leakagementioning

confidence: 99%

Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks

et al. 2018

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Improvements of the systematic uncertainty, frequency instability, and long-term reliability of the two caesium fountain primary frequency standards CSF1 and CSF2 at PTB (Physikalisch-Technische Bundesanstalt) are described. We have further investigated many of the systematic effects and made a number of modifications of the fountains. With an optically stabilized microwave oscillator, the quantum projection noise limited frequency instabilities are improved to 7.2 × 10 −14 (τ /1 s) −1/2 for CSF1 and 2.5 × 10 −14 (τ /1 s) −1/2 for CSF2 at high atom density. The systematic uncertainties of CSF1 and CSF2 are reduced to 2.74 × 10 −16 and 1.71 × 10 −16 , respectively. Both fountain clocks regularly calibrate the scale unit of International Atomic Time (TAI) and the local realization of Coordinated Universal Time, UTC(PTB), and serve as references to measure the frequencies of local and remote optical frequency standards.

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Section: Microwave Leakagementioning

confidence: 99%

Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks

et al. 2018

View full text Add to dashboard Cite

show abstract

“…For CSF2 the Ramsey cavity microwaves are instead frequency detuned when the atoms are outside the Ramsey cavity [68,69]. The DDS in the microwave synthesizer (see subsection 2.3) phase-continuously steps the frequency by about 390 kHz and additional phase synchronization preserves the phase of the interrogating microwaves [31].…”

Section: Microwave Leakagementioning

confidence: 99%

Advances in the accuracy, stability, and reliability of the PTB primary fountain clocks

Weyers,

Gerginov,

Kazda

et al. 2018

Preprint

View full text Add to dashboard Cite

Improvements of the systematic uncertainty, frequency instability, and long-term reliability of the two caesium fountain primary frequency standards CSF1 and CSF2 at PTB (Physikalisch-Technische Bundesanstalt) are described. We have further investigated many of the systematic effects and made a number of modifications of the fountains. With an optically stabilized microwave oscillator, the quantum projection noise limited frequency instabilities are improved to 7.2 × 10 −14 (τ /1 s) −1/2 for CSF1 and 2.5×10 −14 (τ /1 s) −1/2 for CSF2 at high atom density. The systematic uncertainties of CSF1 and CSF2 are reduced to 2.74 × 10 −16 and 1.71 × 10 −16 , respectively. Both fountain clocks regularly calibrate the scale unit of International Atomic Time (TAI) and the local realization of Coordinated Universal Time, UTC(PTB), and serve as references to measure the frequencies of local and remote optical frequency standards.

show abstract