The book is a collection of solved problems in Quantum Optics. It deals with a variety of topics which are very relevant in the most recent advances of this explosive field. Semiclassical Theory, Lasers and Micromasers, Master Equations in the case of Systems interacting with Reservoirs, Atom Optics, Quantum Non-Demolition Measurements, Cold Ions, Quantum Trajectories and Decoherence, are among the topics covered.