Abstract

This paper reports the key development steps of a Bi-Frequency Bi-Polarization (BiFBiP) laser system that generates from a single externally-modulated Distributed Feedback (DFB) laser source two phase-coherent optical lines resonant on the Cs D 1 line (894.6 nm), frequency-splitted by 9.192 GHz and exhibiting linear crossed polarizations. Two different architectures, based on electro-optic modulators as key components for optical sidebands generation, are presented. Residual frequency stability performances of the DFB laser source are measured to be less than 10−11 for integration times up to 200 s. Phase noise performances of the optically carried microwave signal as well as polarization analysis at the output of the BiFBiP system are reported. Using this laser system, Coherent Population Trapping (CPT) resonances with contrast up to 5.8 % in a mm-scale vapor cell and 22 % in a cm-scale cell are preliminary reported.

Highlights

  • A major drawback of traditional vapor cell clocks based on Coherent Population Trapping (CPT) [1] is the detection of the atomic clock resonance with a poor contrast

  • A prototype atomic clock based on linillin coherent population trapping resonances in Rb atomic vapor was developed in [5]

  • This method was more recently implemented with alkali atoms of large nuclear spin (Cs atom: 1= 7/2) and demonstrated CPT constrasts of about 10 % [6]

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Summary

INTRODUCTION

A major drawback of traditional vapor cell clocks based on Coherent Population Trapping (CPT) [1] is the detection of the atomic clock resonance with a poor contrast (about 1 %). This is partly due in standard CPT clocks to the use of a circular polarization excitation scheme leading numerous atoms to be lost in extreme Zeeman sub-levels. A prototype atomic clock based on linillin coherent population trapping resonances in Rb atomic vapor was developed in [5] This method was more recently implemented with alkali atoms of large nuclear spin (Cs atom: 1= 7/2) and demonstrated CPT constrasts of about 10 % [6]. Zanon et al demonstrated the detection of increased CPT resonance contrasts with a so-called lin per lin interaction scheme

FREQUENCy-STABILIZED DISTRIBUTED FEEDBACK
Architecture J
TECHN OLO GIES AND CHARACTERIZATION OF THE BIFBIP S YSTEM
Analysis of polarization
PRELIMINAR DETECTION OF CPT RESONANCES
Findings
Architecture 1
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