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This book delivers a uniquely comprehensive and detailed discussion of the properties of optical resonators and the propagation of laser beams, covering basic theory and practical implementations including recent research. It presents the fundamental theories of resonators, such as geometrical optics, diffraction, and polarization, as well as the characteristics of important resonator schemes and their modelling. The book uses classical optics as a framework for discussing the characteristic parameters of light, such as coherence, polarization, beam size and divergence, and understanding the most fundamental laws of light propagation, including the generation and tailoring of laser beams using optical resonators in continuous-wave, Q-switched and modelocked laser operation. Intra-cavity and extra-cavity harmonic generation are discussed as well