Effects of laser linewidth on an effective method for excitation in three-level atomic systemsby two optimally detuned counterpropagating pulsed lasers

摘要

Population transfer in three-level atomic systems with high efficiency and selectivity is desirable for prac-tical applications in laser spectroscopy, trace analysis, and isotope separation. The effective excitation methodfor achieving this population transfer in three-level atomic systems using coherent two-photon excitation withtwo optimally detuned counterpropagating pulsed lasers, initially investigated analytically assuming mono-chromatic lasers and Doppler-free systems, is studied numerically by solving the density matrix equationsincorporating finite laser linewidth and effective Doppler width. A three-level Yb system is chosen for illus-tration of numerical results. The effects of laser linewidth and effective Doppler width on the values of optimaldetunings and maximum third-level population are discussed.