EFFECTS OF LASER PULSE-SHAPE, BANDWIDTH, AND ATOMIC DOPPLER-BROADENING ON EFFICIENT SELECTIVE EXCITATION

The control of laser frequencies near a two-photon resonance can be ve ry useful for the effective excitation of a 3-level atom. A 3-level la dder system of Yb-168 is chosen. and the Bloch equation is solved in o rder to examine the effects of laser pulse-shape, bandwidth, and atomi c Doppler-broadening on efficient selective excitation. it is revealed that the control of detunings causes the majority of the first-level population to be inverted to the third level regardless of pulse-shape s. Even in a Doppler-broadened system interacting with counter-propaga ting radiation fields, the amount of population inversion is shown to be slightly less than the result without the Doppler broadening. As fo r the laser bandwidth effect, it turns out that the method of efficien t selective excitation is appropriate in the case of Fourier-limited p ulses interacting with the system because of its strong coherent prope rty in which band spectra are described by a set of phase-independent modes.