Measuring multipole moments of the CPT density matrix during optical polarization modulation

Zachary Warren; James C. Camparo

doi:10.1117/12.2616925

2 March 2022 Measuring multipole moments of the CPT density matrix during optical polarization modulation

Zachary Warren, James C. Camparo

Proceedings Volume 12016, Optical and Quantum Sensing and Precision Metrology II; 1201605 (2022) https://doi.org/10.1117/12.2616925
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Chip-scale atomic clocks (CSACs) based on Coherent Population Trapping (CPT) are at the forefront of next-generation timekeeping for diverse applications, including global navigation satellite systems (GNSS), satellite communications, cell-phone networks, and hand-held GNSS receivers. Notwithstanding the potential ubiquity of this atomic device, a performance-limiting aspect of CSACs is the vapor-phase signal-to-noise ratio (SNR) of their ground-state (mF = 0 to mF = 0) atomic hyperfine resonance. Specifically, in commercially available devices angular-momentum optical pumping “pushes” atomic population towards high |mF| Zeeman sublevels at the expense of population in the 0-0 clock transition. Though mitigation strategies for this SNR limiting process have been proposed and demonstrated there has, to date, been little direct measurement of the population distribution among Zeeman sub-states for atoms undergoing CPT, and how that population distribution is altered by SNR improving mitigation strategies. Here, we describe our initial studies examining this question.

Conference Presentation

Citation Download Citation

Zachary Warren and James C. Camparo "Measuring multipole moments of the CPT density matrix during optical polarization modulation", Proc. SPIE 12016, Optical and Quantum Sensing and Precision Metrology II, 1201605 (2 March 2022); https://doi.org/10.1117/12.2616925

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