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SUMMARY:A miniature trapped-ion frequency standard with 171Yb+ - Heather P
 artner (University of New Mexico)
DTSTART:20120430T143000Z
DTEND:20120430T160000Z
UID:TALK37299@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:We report our progress in developing a low-power\, high-stabil
 ity miniature atomic frequency standard based on trapped 171Yb+ ions. In o
 ur scheme\, the ions are buffer-gas cooled and held in a linear quadrupole
  trap that is integrated into a sealed\, getter-pumped vacuum package\, an
 d interrogated on the 12.6 GHz hyperfine transition. We hope to achieve a 
 long-term fractional frequency stability of 10-14 with a complete miniatur
 e clock. In the first phase of the project we successfully demonstrated a 
 clock system based in a 10 cm3 ion trap metal vacuum package with no activ
 e pumping and all components\, excluding the probe laser\, contained in a 
 portable box. In the current phase we are exploring new techniques to furt
 her reduce the size of the vacuum package and other components as well as 
 the integration of the ion trap package with other key elements of the fre
 quency standard\, which include miniaturized light sources at 369 and 935 
 nm and a microfabricated source of Yb for loading the trap. We have also p
 erformed a study of how ion motion in the trap in the presence of field gr
 adients can affect the clock resonance linewidth and the required bias fie
 ld. We have simulated the ion motion to study this effect and observed it 
 in several traps. We will discuss this study in addition to the clock perf
 ormance.
LOCATION:Rutherford building\, Seminar Room B
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