Fig. 5

Schematic representation of three step photionization of erbium (not to scale). I is the intensity of laser in W/cm2. Decay rates (Ξ) and Rabi frequencies (Ξ©) have been calculated from the excitation cross-section data provided in Ref. 28.

Schematic representation of three step photionization of erbium (not to scale). I is the intensity of laser in W/cm2. Decay rates (Ξ) and Rabi frequencies (Ξ©) have been calculated from the excitation cross-section data provided in Ref. 28.