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Éléments de dynamique du laser pour l'élaboration d'une source micro-onde miniaturisée sur la base de la double émission monomode d'un laser à mode de galerie

Abstract : This thesis presents the studies of whispering gallery mode laser dynamics in order to realize a micro-wave source using simultaneous oscillations in a unique whispering gallery mode micro-laser. We show experimental results on the relative intensity noise (RIN) of a Whispering Gallery Mode Laser in ZBLALiP glass doped with Er3+ ions. Besides the pure laser specifications, the RIN spectrum gives informations about the dynamics inside the cavity, such as photon lifetime, effective pumping rate and noise sources. Moreover, we have shown that a single-mode emission comes with the presence of multiple harmonics of the relaxation frequency. The theoretical model taking account the non-linear coupling between photons and atoms allows us to determine the mode volume of the whispering gallery mode in laser regime, which is quite difficult to evaluate in this regime. On the other hand, we have studied the laser dynamics in an industrial IOG-1 glass codoped with Yb3+/Er3+ ions where the signature of a modal coupling, induced by Rayleigh scattering, lies in the RIN spectrum. In this particular case, the two coupled modes operate above threshold. The observed behavior is compared with thoses of a solid state gyro-laser.
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  • HAL Id : tel-02078928, version 1

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Jean-Baptiste Ceppe. Éléments de dynamique du laser pour l'élaboration d'une source micro-onde miniaturisée sur la base de la double émission monomode d'un laser à mode de galerie. Optique [physics.optics]. Université Rennes 1, 2018. Français. ⟨NNT : 2018REN1S067⟩. ⟨tel-02078928⟩

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