The application of the weak electric field pulse to measure the   pseudo-Stark split by the photon echo beating
  A novel scheme for determining the pseudo-Stark splitting of optical lines has been suggested and tested in experiment. The scheme allows one to observe the beating of a photon echo waveform under conditions of overlap in time between a weak electric pulse and its echo- pulse. The pseudo-Stark splitting is equal to the inverse average modulation period of the echo waveform. The photon echo beating of the R1-line in Ruby has been observed. The dependence of the inverse average modulation period of the echo waveform on the average value of the electric field over the optically excited volume has been found. The obtained values of the pseudo-Stark parameter are in good agreement with known literature data. 
V.N.Lisin, A.M.Shegeda, V.V.Samartsev
cond-mat.mes-hall cond-mat.mtrl-sci