Doppler-free two-photon dispersion

G. Grynberg (1) , M. Devaud , C. Flytzanis , B. Cagnac (1)

1 LSH-ENS - Laboratoire de Spectroscopie Hertzienne de l'ENS

We present in this paper a calculation of the non-linear susceptibility near a Doppler-free two-photon transition. In the case of a two-level system, we find a non-perturbative solution. We deduce new effects on the non-linear refractive index which are related to the change of the linear susceptibility because of the transfer of atoms between the ground and excited levels. In the case of a more complex system, we study at the lowest order of perturbation the anisotropy induced by one beam on the other. At last, we show that it is easy to observe a bistable behaviour when atoms, inside a Pérot-Fabry cavity, interact with a beam whose wavelength is close to a two-photon resonance.

Mots clés: nonlinear optical susceptibility; optical dispersion; refractive index; two photon spectra

Domaines: Articles anciens

G. Grynberg, M. Devaud, C. Flytzanis, B. Cagnac. Doppler-free two-photon dispersion. Journal de Physique, 1980, 41 (9), pp.931-942. ⟨10.1051/jphys:01980004109093100⟩. ⟨jpa-00208924⟩