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Passive atomic frequency standard stability requirements for the short crystal

, Then type (i) is still correct. Passive design Desk reasonable atomic frequency standard should be V \Crystal places located near the rate of F noise in the corresponding frequency offset is,[link widoczny dla zalogowanych], ¨ JJ Kam through some amount of quantum noise voltage into VN2 = jlfA. (2),[link widoczny dla zalogowanych], is the number of times that amount, the amount of the reference line Kam rate,[link widoczny dla zalogowanych], which can be expressed as \type (2) and (3) availability of surface where MAy1. is the reference line of the center frequency. them. is the crystal oscillator output frequency,[link widoczny dla zalogowanych], so there A12q (Vs / VN!) A warehouse was also used to characterize the variance of Jade / (4) Clearly = feet,[link widoczny dla zalogowanych], (5) the type (5) and equation (1) is the same in form. For the design of atomic frequency standard station management, it may be that the type l (t) of V is equal to V so the V \can be concluded: the amount of chain from the times of the internal frequency f noise variance from the Arab position must also be much smaller than the internal noise from the boat Quantum written by the Ministry of Allan variance. The following give an example. set the amount of a passive atomic standard FlOOHz, by (1) determine the short stability is 1 × 10. '/ ls, and let r = 1B when the loop gain for the i00, the crystal (10mB) should be better than 1 × i0_.. (because when r from 1s reduced lOmB, the noise bandwidth increases 100 times, 10 times the noise voltage increases, (f) also increased 10-fold) j while the crystal of the (1s), only require it to better than 1 × 10/1s on the line. of course The actual crystal is always a (t at) <(10roB), so long as (IOtas) <1 × 1O. / 10ms to meet, (ts) <1 × 10/ls naturally be satisfied. short , the short stability of the crystal should focus on reducing the requirement (1Oms), the blind pursuit of reduced (1s) would be futile. Of course, if the crystal (10ms) can not meet the above requirements, can also be used to filter crystal filter out the noise, the early atomic frequency standard have adopted this approach. but the crystal temperature drift of the permanent filter brings some trouble, so the steady performance in recent years with the continuous improvement of the short crystal, this approach has not used the. reference l history of literature Ren Road, Wangqing Ji, Fu Ji will be waiting. quantum frequency standard principles. Beijing: (continued from page Ll5) Science Press, 1986.RapidMeasurementandAnalysisfortheNonlinearParametersofOpticalThin-filmsSunDegu ~, WaugXtaoyuan, WengZhaoheng (ChangchunInstituteofOpticsandFineMechanics, AcademiaSinica, Changchun130022) Abstract - Thipaperproposesaconvenientandeffectivemethodforrapidlymeasuringandanalyzingthenonlinearparametersofopticalthinfilms , andusesittoi ~ e $ su [ethenonlinearitiesofrefractive-indexandextinctcoefficient.Inthismethod, theexperimentaldataaredirectlycomputedandprocessedhyRcomputerprogram.Finally, thelimitationofthemeasurementmethodisanalyzedanddcI】 8sedindetaj1.KeywordstOpticalthinfilm ~ Nonlinearity1Mea ~, urementandazalyNortheastInstituteofElectricPower, Jilin132012

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