Abstract

We report, the first time to our knowledge, the measurement of reorientational relaxation time T of dye molecules dissolved in solution using incoherent light. In the experiment, an AO Q-switched and frequency doubled YAG laser with pulse width 150 ns long compared with the T_or was used, the measured dye molecules were Rh6G and RhB dissolved in different solvents. The transmitted intensity of the probe light was measured by changing the delay time t between the probe light pulse and pumping pulse. The resolution time was governed only by the coherence time t_c of the laser light. A combined time constant T (1/T = 1/T₁ + 1/T_or, T is the first excited state lifetime) was employed.

© 1990 Optical Society of America