Laser oscillation device

A laser oscillation device comprising:

• a laser oscillation unit to generate a plurality of first laser beams having their respective wavelengths different from one another;
• a plurality of sensors having their respective sensitivity characteristics different from one another, the sensitivity characteristics each representing light-receiving sensitivity for the wavelengths of the first laser beams, the sensors outputting a first voltage for each wavelength dependent on outputs of the first laser beams;
• and
• a computing circuit to compute an output ratio between a target output voltage of each of the sensors that has been set based on a machining requirement and the first voltage, and in a case where an output ratio dispersion among the sensors is greater than a setting value, compute an output correction factor for each of the sensors based on an estimated value of an output voltage of each of the sensors calculated for each of the wavelengths of the first laser beams, and to control an output of the laser oscillation unit based on a plurality of second voltages determined by a target output voltage for each wavelength after correction, which has been computed based on the output correction factor.