Abstract
The effects of laser bandwidth and Doppler broadening on the population dynamics of the ladder configuration which consists of three levels of Gd such as 9D50 (999.121 cm-1), 5d6s6p 9F4 (17973.611 cm-1) and 5d6s7s 9D40 (33534.095 cm-1) are studied numerically using the Bloch equation. In particular, for the examination of the bandwidth effect we choose a finite-bandwidth quasi-monochromatic laser and describe its field as a set of phase-independent modes. The remarkable fact is noted that the laser bandwidth of 1 GHz causes radiation-atom interactions to be very strongly incoherent, so the three-level populations are the same throughout almost all the interaction-time region.
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