High resolution laser spectroscopy of cesium and rubidium molecules with optically induced coherence

摘要

This work is devoted to the study of the quantum coherent effects in diatomic molecular systems by using high resolution laser spectroscopy. In particular, we have studiedthe rubidium diatomic molecular gaseous medium's absorption spectrum with highresolution single mode laser spectroscopy. The derived electronic and rotational vibrational constants were used in the backward Raman amplification experiment ofRb diatomic molecule. Both experimental results and theoretical calculation confirms that there is strong backward directionally dependent radiation. This effect canfurther be utilized in remote detection of chemical material.In the saturated spectroscopy experiment of the cesium diatomic molecule, long-lived ground state coherence was observed. The coherence would decay at a rate lessthan the natural life time of the excited states, which indicates great possibility forperforming the quantum optics experiments previously performed in atomic systemsonly.Electromagnetically induced transparency has been observed in many atomicsystems for many years, while it has been seldom realized in molecular systems.In our experiment of electromagnetically induced transparency in cesium diatomicmolecules, we utilized ???? energy levels, and observed subnatural linewidth. This is the first time to realize a ???? type EIT in a molecular ensemble. This experiment willlead to many other experiments of quantum effects in a molecular system, such likemagnetic optical rotation, light storage in ensemble of molecules.Magnetically induced chirality in an atomic ensemble is also investigated in myresearch.