Population and nonlinear polarization coherent changes on Raman transition due to two-photon pulse excitation

摘要

Population and third order nonlinear polarization coherent changes on Raman electronic transition of thallium atoms excited by a couple of 30 ps pulses of dye- and Nd:YAG lasers were observed. Collimated exciting and probing beams propagated through a heated cell of one centimeter length with thallium vapor. Population and nonlinear polarization dependences as functions of exciting pulses energy product were monitored using permanently delayed probing pulses.