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Nonlinear mirror mode-locking of solid state lasers

Mode-locking technique based on intracavity frequency doubling referred as a nonlinear mirror mode-locking proposed by Stankov is discussed. Frequency doubler inside the cavity, together with an output mirror with high reflectivity at the second harmonics, builds a reflector, whose reflectivity at the fundamental wavelength can either increase or decrease, depending on the phases of the fundamental and second harmonic radiation. Application of this method to lamp and diode pumped solid state lasers are discussed as well as its difference from recently studied technique of mode locking using polarization rotation in quadratic nonlinear crystal.