High gain selective amplification in whispering gallery mode resonators: analysis by cavity ring down method

Patrice Feron (1) , Alphonse Rasoloniaina (1) , Vincent Huet (1) , Elodie Le Cren (1) , Stephane Trebaol (1) , G. Nunzi Conti (2) , Hélène Sérier-Brault (3) , Michel Mortier (3) , Yannick Dumeige (1)

1 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
2 IFAC - Istituto di Fisica Applicata "Nello Carrara"
3 LCMCP (site ENSCP) - Laboratoire de Chimie de la Matière Condensée de Paris (site ENSCP)

We study both theoretically and experimentally the dispersive properties of single whispering gallery mode resonators. We present a simple experimental protocol which allows us to obtain in detail its coupling regime and thus their dispersive properties. We demonstrate a compact optical amplifier with a gain up to 20dB in an Erbium doped fluoride microsphere of 135μm in diameter coupled via a tapered fiber. The model is also applied to analyze the dynamic behavior of the modal coupling between two degenerate resonances of the same cavity. In particular, this can be used to describe the coupling of counterpropagating whispering gallery modes (WGM) by Rayleigh scattering. The theory is successfully compared to experiments carried out in silica microspheres

Mots clés: Whispering Gallery Mode Resonator; Cavity Ring Down Method; Selective Amplification; Rayleigh Scattering

Domaines: Optique [physics.optics]

Patrice Feron, Alphonse Rasoloniaina, Vincent Huet, Elodie Le Cren, Stephane Trebaol, et al.. High gain selective amplification in whispering gallery mode resonators: analysis by cavity ring down method. Photonics West 2013 (LASE), Feb 2013, San Francisco, United States. pp.86000G, ⟨10.1117/12.2002821⟩. ⟨hal-00997158⟩