The Electromagnetic Field -- Geometrical Optics -- Wave Optics -- Polarization -- Basic Properties of Optical Resonators -- The Fabry Perot Resonator -- Passive Open Resonators -- Stable Resonators -- Resonators on the Stability Limits -- Unstable Resonators -- Resonators with Internal Optical Elements -- Open Resonators with Gain -- The Active Medium -- Output Power of Laser Resonators -- Infl…