Low Noise Simultaneous Fluorescence Detection of Two Atomic States (PREPRINT)
Interim rept. 1 Dec 2004-30 Nov 2005
STANFORD UNIV CA DEPT OF PHYSICS
Pagination or Media Count:
We have demonstrated a new technique for fluorescence detection of ultracold atoms. Fluorescence from two spatially separated clouds of ultracold atoms illuminated by a mutual probe laser was imaged onto opposite quadrants of a position-sensitive detector. The populations in the two separated atomic clouds were measured by integrating the quadrant detector photocurrents. Simultaneous detection of the populations of the two atomic clouds was used to reduce noise caused by fluctuations in detection laser amplitude and frequency. Using this technique we observed quantum projection noise limited detection signal-to-noise ratios exceeding 20001. To demonstrate the application of our highly Sensitive detection we compared two atomic clocks with interrogation times of only 80 ms to obtain a relative frequency stability of 1x 10exp -13 Tau exp -12 where TAU is the integration time in seconds.
- Atomic and Molecular Physics and Spectroscopy
- Lasers and Masers