A diode-pumped solid-state laser oscillator optically pumps a laser medium. The
oscillator has at least one pumping light source that emits light in a predetermined
wavelength band, and a laser medium that absorbs light in the wavelength band.
In the wavelength band, the optical absorption index of the laser medium increases
with an increase in wavelength, and the optical radiation energy of the light source
decreases with an increase in wavelength. Thus, with respect to wavelength changes,
an increase in the optical absorption index is cancelled out by a decrease in the
radiation energy, making the stability of the laser output less dependent on the
temperature of the optical pumping medium or laser medium.
