Single-longitudinal-mode operation and second-harmonic generation of Nd:YVO_4 microchip lasers

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Abstract
A single-mode output of 221 and 16 mW for the fundamental and second-harmonic light was obtained with the combination of a Nd:YVO4 microchip laser and an intracavity KTP crystal. It was found that the beam size and laser power in a plano–plano cavity were dependent on the absorption coefficient of the laser medium and that the material that had a higher absorption coefficient produced higher output power and smaller beam size in the laser cavity. This means that Nd:YVO4 is suitable not only for single-mode oscillation but also for efficient intracavity second-harmonic generation.