This book is a comprehensive work including all the regular nonlinear phenomena like SHG, SFG, DFG, FWM, Raman and Brillouin Scatterings, and so on. Quantum mechanical theory of nonlinear optical susceptibility is on chapter 3 whereas chapter 6 is about nonlinear optics in two-level approximations which contains sections on optical Bloch equations and Rabi oscillations.
Finally chapter 13 is on ultrafast nonlinear optics. We have to say that Professor Boyd has done a wonderful job on this book, since anyone from senior research scientists to first year graduate students all can refer to it.This book reminds me of Jackson's book on E &M in the sense that although you might not get `it' at that exact moment you can always count on it to show the correct way to tackle. All in all, if you are looking for a book on nonlinear optics this is the one you should have.