This textbook discusses the basic principles and some applications of a rapidly developing branch，nonlinear optics(NLO)，in the optics science．Nonlinear optics emerged in 1961 and has got well matured in past forty years．As the volume of this textbook is limited，we will only talk about the most important principles and developments in nonlinear optics．
Chapter 1 is the introduction to the graduates about the forty years development of nonlinear optics．Chapter 2 relates to the basic theory of the

PREFACE
Chapter1 Introduction
1.1 From Linear Optics to Nonlinear Optics
1.2 The FirstTen Year s Evolution
1.3 Rapid Development Period of Nonlinear Optics
1.4 Continuing Progress Period
Chapter2 Theory of Nonlinear Optical Susceptibility
2.1 Classical Model
2.2 Perturbation Theory
2.3 Density Matrix Approach
2.4 Symmetry of the Susceptibility
2.5 PracticalEfforts
Chapter3 Coupled-Wave Equations and Second Harmonic Generation
3.1 CoupledˉWave Equations
3.2 Second Harmonic Generation
3.3 Phase Matching
3.4 Effective SHG Coefficient
3.5 Practical Consideration of SHG
Chapter4 Frequency Mixing and Optical Parametric Oscillation
4.1 Sum-Frequency Generation
4.2 Difference-Frequency Generation
4.3 Optical Parametric Amplifier
4.4 Optical Parametric Oscillator
Chapter5 Third-Order Nonlinear Optical Phenomena
5.1 General Description of Third-Order NLO Phenomena
5.2 Coupled-Wave Equations and Phase Matching
5.3 Effects Related to Photo-Induced Refractive Index
5.4 Z-scan Technique
Chapter6 Four-Wave Mixing
6.1 Degenerate Four-WaveMixing
6.2 Near Degenerate Four-Wave Mixing
6.3 Experimental Research and Applications ofF WM Effect
6.4 Transient Grating
Chapter7 Stimulated Raman Scattering
7.1 Classical Treatment
7.2 Semiclassical Treatment of SRS Process
7.3 The Applications of SRS
7.4 Coherent Raman Spectroscopy
Chapter8 Resonant Interaction between Optical Field and Matter
8.1 Semiclassical Treatment
8.2 Dressed State
8.3 The Experimental Studies
8.4 Optical Limiting
Chapter9 Nonlinear Optics in Optical Fiber
9.1 Basic Properties of Optical Fiber
9.2 Propagation of LightWave in Fiber
9.3 Group VelocityMismatching and Self-Phase Modulation
9.4 Solitons
9.5 Nonlinear Optical Effects in Fiber and Optical Communications
Chapter10 Ultrashort Lasers and Ultrafast Phenomena
10.1 UltrashortLasers
10.2 Characterization of Ultrashort Laser Pulses
10.3 Researches on the Ultrafast Responses
10.4 High-Order Harmonics and X-Ray Coherent Radiations
References
Index