High Pressure CPT Signals using Intensity Modulated Light
Abstract
Coherent Population Trapping (CPT) is a promising technique for use in miniature atomic clocks, since it uses modulated light to detect clock resonances rather than microwaves. This method typically uses frequency-modulated light to probe cells with low buffer gas pressure, in which the ground-state hyperfine structure is clearly resolved. However, conventional frequency-modulated CPT fails at the higher pressures needed to inhibit wall collisions in miniature cells. We present theory and supporting experimental results of high-pressure CPT signals using intensity-modulated light. Circularly polarized light tuned to the Rb D1 line traps most of the atoms in the F=2, m_F=2, where the microwave ``end resonance"^2 is excited. We will show experimental data and briefly discuss linewidth broadening mechanisms. 2 Y.-Y. Jau, A. B. Post, N. N. Kuzma, et al., Phys. Rev. Lett. (in press, 2004).
- Publication:
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APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- May 2004
- Bibcode:
- 2004APS..DMP.L2002P