# 25ème Congrès Général de la SFP 2019

8-12 July 2019
Cité des Congrès
Europe/Paris timezone

## Phase transfer by a frequency comb for three-photon coherent population trapping

8 Jul 2019, 18:15
15m
Salle I (Cité des Congrès)

Orale

### Speaker

Cyril Chatou (Aix-Marseille université)

### 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

### Primary authors

Cyril Chatou (Aix-Marseille université) Marylise Marchenay

### Co-authors

Dr Mathieu Collombon Dr Gaëtan Hagel Dr Jofre Pedregosa-Gutierrez (PIIM/CIML) Prof. Marie Houssin Dr Martina Knoop (PIIM/CIML) Caroline Champenois (CNRS-Aix-Marseille Université, PIIM)