This Third Edition incorporates material on important new developments in lasers and quantum electronics. Covers phase-conjugate optics and its myriad applications, the long wavelength quaternary semiconductor laser and our deepened understanding of the physics of semiconductor lasers especially that applying to their current modulations and limiting bandwidth, laser arrays and the related concept of super modes, quantum well semiconductor lasers, the role of phase amplitude coupling in laser noise and free electron lasers. In addition, the chapters on laser noise and third order nonlinear effects have been extensively revised.Basic Theorems and Postulates of Quantum Mechanics.Some Solutions of the Time-Independent Schrodinger Equation.Matrix Formulation of Quantum MechanicsLattice Vibrations and Their QuantizationElectromagnetic Fields and Their Quantization.The Propagation of Optical Beams in Homogeneous and Lens like MediaOptical ResonatorsInteraction of Radiation and Atomic SystemsLaser OscillationSome Specific Laser SystemsSemiconductor Diode LasersQuantum Well LasersThe Free-Electron LaserThe Modulation of Optical RadiationCoherent Interactions of a Radiation Field and an Atomic SystemIntroduction to Nonlinear Optics Second-Harmonic GenerationParametric Amplification, Oscillation and FluorescenceThird-Order Optical Nonlinearities Stimulated Raman and Brillion ScatteringPhase-Conjugate-Optics and Photorefractive Beam CouplingQ-Switching and Mode Locking of LasersNoise and Spectra of Laser Amplifiers and OscillatorsGuided Wave Optics Propagation in Optical Fibers