Abstract
Dynamic relaxation processes of excitons have attracted a great interest of a number of researchers in solid state spectroscopy. By means of a variety of ultrafast spectroscopic techniques, it has now become possible to observe directly the dynamics of photo-excited excitons on the picosecond time scale from the various standpoints. This paper introduces the recent spectroscopic techniques used by us to study dynamic relaxation processes of excitons. One spectroscopic technique is the computer-aided picosecond induced absorption and luminescence spectroscopy to study energy relaxation processes of excitons. The other is the time-resolved non-degenerate four-wave mixing to study the dephasing relaxation processes of excitons. By using these techniques we have studied picosecond relaxation processes of excitons in three characteristic materials, that is, CuCl, CdSe and GaAs-AlAs multi-quantum-well structures (MQW).
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