The field of ultrafast spectroscopy of semiconductors and their nanostruc- tures continues to be an active field of research. Exciting new developments have taken place since the first edition of this book was completed in 1995. This revised edition includes a discussion of many of these recent develop- ments in the field. This is accomplished by adding a chapter on Recent De- velopments at the end of the book. This approach was selected to provide a discussion of results while they are still relatively recent. Results published before the end of May 1998 were considered for inclusion in this...