Patent ID: 7382812

Claim:
A method of producing a solid state laser device including a laser diode for outputting an excited laser beam; an Nd:YAG laser medium excited by the excited laser beam to induce and emit a fundamental wave; a non-linear optical element for converting the fundamental wave to a higher harmonic wave; an etalon for changing a longitudinal mode to a single mode; and an output mirror forming one end of an optical resonator and transmitting the outputted laser beam, said producing method for a solid state laser device comprising the steps of: observing the outputted laser beam of the solid state laser device to measure a central wavelength λ 1 of an oscillating line having the wavelength of 1064.2 to 1065.2 nm by the Nd:YAG laser medium; observing the outputted laser beam of the solid state laser device having the etalon removed to measure a central wavelength λ 0 of an oscillating line having the wavelength of 1064.2 to 1065.2 nm by the Nd:YAG laser medium; obtaining a corrected optical path length Δ of the etalon so that the transmittance of the etalon relative to an oscillating line having the wavelength of 1061.6 to 1062.2 nm by the Nd:YAG laser medium is 0.9 or lower on the basis of the λ 0 and λ 1 ; and correcting the optical path of the etalon by the corrected optical path length Δ.