A laser light generating apparatus has a first light source generating a light beam of a fundamental wavelength, a resonator made up of a plurality of reflection devices having high reflectance with respect to the fundamental wavelength of the light beam and a non-linear optical crystal element located within the resonator and generating a light beam of harmonic when the light beam of the fundamental wavelength is input thereto. Further, the laser light generating apparatus an amplifier element located within the resonator and amplifying the light beam of the fundamental wavelength therein and an energy source for exciting the amplifier element.