Orateur
Description
One of the applications of an optical frequency comb is the phase coherence transfer between lasers of very different wavelengths. In our experiment we use an offset-free optical frequency comb to reduce the relative phase fluctuations of three different lasers (1). We take advantage of this phase coherence to build a stable dark state (2) based on three-photon coherent population trapping (CPT) in a cloud of trapped Ca$^{+}$ ions. When fulfilled, the three-photon resonance condition is observed as a dark resonance in the laser induced fluorescence and offers a highly resolved line referenced to the $\mid D_{3/2}\rangle$ and $ \mid D_{5/2}\rangle$ transition at 1.82 THz (see fig.1). Based on our first observations, the expected performances in view of a high precision measurement will be presented.
Choix de session parallèle | 1.4 Mesures de précision avec des peignes de fréquence optiques |
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