1 Introduction 1.1 Chaos and Lasers 1.2 Historical Perspectives of Chaos in Semiconductor Lasers 1.3 Outline of This Book 2 Chaos in Laser Systems 2.1 Laser Model and Bloch Equations 2.1.1 Laser Model in a Ring Resonator 2.1.2 Light Emission and Absorption in Two-Level Atoms 2.1.3 Maxwell-Bloch Equations 2.2 Lorenz-Haken Equations 2.2.1 Lorenz-Haken Equations 2.2.2 First Laser Threshold 2.2.3 Second Laser Threshold 2.3 Classifications of Lasers 2.3.1 Classes of Lasers 2.3.2 Class C Lasers 2.3.3 Class B Lasers 2.3.4 Class A Lasers 3 Semiconductor Lasers and Theory 3.1 Semiconductor Lasers 3.2 Oscillation Conditions of Semiconductor Lasers 3.2.1 Laser Oscillation Conditions 3.2.2 Laser Oscillation Frequency 3.2.3 Dependence of Oscillation Frequency on Carrier Density 3.3 Derivation of Rate Equations 3.3.1 Gain at Laser Oscillation 3.3.2 Rate Equation for the Field 3.3.3 Line width Enhancement Factor 3.3.4 Laser Rate Equations 3.4 Linear Stability Analysis and Relaxation Oscillation 3.4.1 Linear Stability Analysis 3.4.2 Relaxation Oscillation 3.5 Langevin Noises 3.5.1 Rate Equations Including Langevin Noises 3.5.2 Langevin Noises 3.5.3 Noise Spectrum 3.5.4 Relative Intensity Noise (RIN) 3.5.5 Phase Noise and Spectral Linewidth 3.6 Modulation Characteristics 3.6.1 Injection Current Modulation 3.6.2 Intensity Modulation Characteristics 3.6.3 Phase Modulation Characteristics 3.7 Waveguide Models of Semiconductor Lasers 3.7.1 Index- and Gain-Guided Structures 3.7.2 Waveguide Models 3.7.3 Spatial Modes of Gain- and Index-Guided Lasers 3.7.4 Effects of Spontaneous Emission in Gain- and Index-Guided Lasers 3.7.5 Laser Types 4 Theory of Optical Feedback in Semiconductor Lasers 4.1 Theory of Optical Feedback 4.1.1 Optical Feedback Effects and Classifications of Optical Feedback Phenomena 4.1.2 Theoretical Model 4.2 Linear Stability Analysis for Optical Feedback Systems 4.2.1 Linear Stability Analysis 4.2.2 Linear Mode, and Stability and Instability in Semiconductor Lasers 4.2.3 Gain Reduction Due to Optical Feedback 4.2.4 Linewidth in the Presence of Optical Feedback 4.3 Feedback from a Grating Mirror 4.4 Phase-Conjugate Feedback 4.5 Incoherent Feedback and Polarization-Rotated Optical Feedback 4.5.1 Incoherent Feedback 4.5.2 Polarization-Rotated Optical Feedback 4.6 Filtered Feedback 5 Dynamics of Semiconductor Lasers with Optical Feedback 5.1 Optical Feedback from a Conventional Reflector 5.1.1 Optical Feedback Effects 5.1.2 Potential Model in Feedback Induced Instability …… 6 Dynamics in Semiconductor Lasers with Optical Injection 7 Dynamics of Semiconductor Lasers with Optoelectronic Feedback and Modulation 8 Instability and Chaos in Various Laser Structures 9 Chaos Control and Applications 10 Stabilization of Semiconductor Lasers 11 Stability and Bistability in Feedback Interferometers, and Their Applications 12 Chaos Synchronization in Semiconductor Lasers 13 Chaotic Communications in Semiconductor Lasers