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Performance of the PARCS Testbed Cesium Fountain Frequency Standard
- 2004 IEEE International Ultrasonics, Ferroelectrics, and Frequency Control Joint 50th Anniversary Conference
, 2004
"... Abstract-A cesium fountain frequency standard has been developed as a ground testbed for the PARCS (Primary Atomic Reference Clock in Space) experiment-- an experiment intended to fly on the lnternational Space Station. W e report on the performance of the fountain and describe some of the implement ..."
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Abstract-A cesium fountain frequency standard has been developed as a ground testbed for the PARCS (Primary Atomic Reference Clock in Space) experiment-- an experiment intended to fly on the lnternational Space Station. W e report on the performance of the fountain and describe some of the implementations motivated in Iarge part by flight considerations, but of relevance for ground fountains. I n particular, we report on a new technique for delivering cooling and trapping laser beams to the atom collection region, in which a given beam is recirculated three times effectively providing much more optical power than traditional configurations. Allan deviations down to 10.' ' have been achieved with this method. Keywords- cesium, fountain, light shift, frequency standard, atomic clock
40th Annual Precise Time and Time Interval (PTTI) Meeting PROGRESS ON A PORTABLE RUBIDIUM FOUNTAIN FREQUENCY STANDARD*
"... We are developing a simple and transportable laser-cooled rubidium (Rb) atomic fountain frequency standard. The optical package for this system uses DFB (distributed feedback) diode lasers and a frequency offset locking scheme to generate the optical frequencies needed for laser-cooling, launching, ..."
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We are developing a simple and transportable laser-cooled rubidium (Rb) atomic fountain frequency standard. The optical package for this system uses DFB (distributed feedback) diode lasers and a frequency offset locking scheme to generate the optical frequencies needed for laser-cooling, launching, post-cooling, and detection of Rb atoms. This atomic fountain will be useful as a transfer standard and secondary standard for calibrating nontransportable frequency standards, as well as a measurement tool for the gravitational redshift. Here, we describe the progress made on this project, including our recent observation of a magneto-optical trap (MOT), and the anticipated performance of our transportable Rb fountain frequency standard.
Light Shift Measurements in a Cesium Fountain without the use of Mechanical Shutters
"... Abstract — We present measurements confirming operation of a cesium fountain frequency standard with light shift below 10-15 (and with evidence suggesting it is several orders of magnitude below this level) but without the use of mechanical shutters. Suppression of the light shift is realized using ..."
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Abstract — We present measurements confirming operation of a cesium fountain frequency standard with light shift below 10-15 (and with evidence suggesting it is several orders of magnitude below this level) but without the use of mechanical shutters. Suppression of the light shift is realized using a master-slave laser configuration by reducing the overall optical power delivered to the physics package as well as spoiling the injection of the slave, causing it to lase far off resonance (1-2 nm) as proposed by the authors several years ago [1]. In the absence of any mitigation, this (AC Stark) shift, due to near-resonant laser light reaching the atoms during their microwave interrogation period, is the largest shift in such frequency standards (2×10-11 for our fountain). Mechanical shutters provided adequate light attenuation but have been prone to failure. Keywords- cesium fountain, light shift, frequency standard, atomic clock, injection locked lasers I.
