Search Results - "Szymaniec, K."

Frequency Ratio of Two Optical Clock Transitions in Yb + 171 and Constraints on the Time Variation of Fundamental Constants by Godun, R. M., Nisbet-Jones, P. B. R., Jones, J. M., King, S. A., Johnson, L. A. M., Margolis, H. S., Szymaniec, K., Lea, S. N., Bongs, K., Gill, P.

“…Singly ionized ytterbium, with ultranarrow optical clock transitions at 467 and 436 nm, is a convenient system for the realization of optical atomic clocks and…”
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Cancellation of the collisional frequency shift in caesium fountain clocks by Szymaniec, K, Chałupczak, W, Tiesinga, E, Williams, C J, Weyers, S, Wynands, R

“…We have observed that the collisional frequency shift in primary caesium fountain clocks varies with the clock state population composition and, in particular,…”
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Prospects of operating a caesium fountain clock at zero collisional frequency shift by SZYMANIEC, K, CHALUPCZAK, W, WEYERS, S, WYNANDS, R

“…Recently it has been shown both theoretically and experimentally that, for certain operating conditions of a caesium fountain primary frequency standard, the…”
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Apparent Power-Dependent Frequency Shift Due to Collisions in a Cesium Fountain by Szymaniec, K., Chalupczak, W., Weyers, S., Wynands, R.

“…We describe a situation where a varying collisional frequency shift in cesium fountain primary frequency standards can be misinterpreted as a power-dependent…”
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Accumulation of a clock state population by optical pumping in a caesium fountain by Park, S E, Szymaniec, K

“…We have implemented a technique of optical pumping (OP) to increase the clock state populations in a caesium fountain frequency standard. Our initial…”
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Cooling in an optical lattice for a caesium fountain frequency standard by Chalupczak, W., Szymaniec, K., Henderson, D.

“…We report progress toward a Cs-fountain frequency standard operating in the nanokelvin temperature range. We have implemented the Raman sideband cooling in a…”
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Operation of the caesium fountain frequency standard NPL-CsF2 at the collisional shift cancellation point by Szymaniec, K, Park, S E, Marra, G, Ovchinnikov, Y B

“…We report on characterisation of a caesium fountain primary frequency standard NPL-CsF2 operating in a regime where the collisional frequency shift is nearly…”
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Normalised Detection of Clock States by Cold Atom Recapture Method by Walby, S., Knapp, M., Whale, J., Wilson, A., Hendricks, R., Foot, C.J., Szymaniec, K.

“…SummaryA method of detecting normalised clock state populations in an atomic fountain clock using only the initial trapping laser beams has been investigated…”
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Rapid Determination of Microwave Cavity Crossing Positions for Atoms in Fountain Clocks by Burrows, K., Hendricks, R.J., Szymaniec, K.

“…We demonstrate a convenient experimental method, that facilitates faster and more accurate evaluation of the distributed cavity phase, a leading systematic…”
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Injection locking of diode lasers to frequency modulated source by Szymaniec, K, Ghezali, S, Cognet, L, Clairon, A

“…We present a laser system which in a simple way generates two Raman beams for a velocity selection or cooling experiment. A narrow-band diode laser is…”
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Hertz-Level Measurement of the Optical Clock Frequency in a Single$^{88}Sr^{+}$Ion by Margolis, H. S., Barwood, G. P., Huang, G., Klein, H. A., Lea, S. N., Szymaniec, K., Gill, P.

“…The frequency of the$5s ^{2}S_{1/2}-4d ^{2}D_{5/2}$electric quadrupole clock transition in a single, trapped, laser-cooled$^{88}Sr^{+}$ion has been measured by…”
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Measuring the stability of fundamental constants with a network of clocks by Barontini, G., Blackburn, L., Boyer, V., Butuc-Mayer, F., Calmet, X., Crespo López-Urrutia, J. R., Curtis, E. A., Darquié, B., Dunningham, J., Fitch, N. J., Forgan, E. M., Georgiou, K., Gill, P., Godun, R. M., Goldwin, J., Guarrera, V., Harwood, A. C., Hill, I. R., Hendricks, R. J., Jeong, M., Johnson, M. Y. H., Keller, M., Kozhiparambil Sajith, L. P., Kuipers, F., Margolis, H. S., Mayo, C., Newman, P., Parsons, A. O., Prokhorov, L., Robertson, B. I., Rodewald, J., Safronova, M. S., Sauer, B. E., Schioppo, M., Sherrill, N., Stadnik, Y. V., Szymaniec, K., Tarbutt, M. R., Thompson, R. C., Tofful, A., Tunesi, J., Vecchio, A., Wang, Y., Worm, S.

“…The detection of variations of fundamental constants of the Standard Model would provide us with compelling evidence of new physics, and could lift the veil on…”
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Primary Frequency Standard NPL-CsF2: Optimized Operation Near the Collisional Shift Cancellation Point by Szymaniec, K, Sang Eon Park

“…We report important modifications introduced to the fountain frequency standard NPL-CsF2, both to its hardware and operation protocol. First, an additional…”
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Strontium ion optical frequency standard with Hz-level uncertainty by Margolis, H.S., Barwood, G.P., Huang, G., Klein, H.A., Lea, S.N., Szymaniec, K., Gill, P.

“…The frequency of the 674 nm 5s/sup 2/S1/2-4d/sup 2/D/sub 5/2/ electric quadrupole clock transition in a single cold /sup 88/Sr/sup +/ ion, with the quadrupole…”
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A microwave cavity designed to minimize distributed cavity phase errors in a primary cesium frequency standard by Gibble, K., Lea, S. N., Szymaniec, K.

“…We present the design of the Ramsey cavity to be used in the refurbished cesium primary frequency standard NPL-CsF1. This design is optimized to suppress the…”
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Laser cooling of cesium atoms in gray optical molasses down to 1.1 μK by Boiron, D., Michaud, A., Lemonde, P., Castin, Y., Salomon, C., Weyers, S., Szymaniec, K., Cognet, L., Clairon, A.

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Absolute frequency measurement of the 2 S 1/2 – 2 F 7/2 electric octupole transition in a single ion of 171 Yb + with 10 −15 fractional uncertainty by King, S A, Godun, R M, Webster, S A, Margolis, H S, Johnson, L A M, Szymaniec, K, Baird, P E G, Gill, P

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Evaluation of NPL CSF1 frequency standard by Szymaniec, K, Chalupczak, W, Henderson, D

“…In this contribution a new caesium fountain frequency standard at the national physical laboratory (NPL-CsFl) is described. Procedures for evaluation of the…”
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Initial evaluation of the NPL caesium fountain frequency standard by Szymaniec, K., Chalupczak, W., Henderson, D.

“…An initial performance evaluation of the caesium fountain primary frequency standard at the NPL is reported. Improved magnetic shielding has resulted in the…”
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Frequency ratio of two optical clock transitions in 171Yb+ and constraints on the time variation of fundamental constants by Godun, R M, Nisbet-Jones, P B R, Jones, J M, King, S A, Johnson, L A M, Margolis, H S, Szymaniec, K, Lea, S N, Bongs, K, Gill, P

“…Singly ionized ytterbium, with ultranarrow optical clock transitions at 467 and 436 nm, is a convenient system for the realization of optical atomic clocks and…”
Get full text