| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength conversion laser device of a simple configuration, emitting the laser beam of high roundness with little loss and keeping a long device service life.SOLUTION: The wavelength conversion laser device is equipped with: a resonator for emitting the fundamental wave of the laser beam by oscillating the laser beam; and a wavelength conversion element 10 arranged on the outer side of the resonator, for converting the fundamental wave to the 1/3 wavelength using the fundamental wave. The wavelength conversion element 10 has: an SHG crystal 2 for converting the fundamental wave to the 1/2 wavelength, generating a second harmonic and emitting the fundamental wave and the second harmonic; and a THG crystal 3 for generating a third harmonic which is the 1/3 wavelength of the fundamental wave using the fundamental wave and the second harmonic and emitting it. In the SHG crystal 2, the incidence plane of the fundamental wave is roughly a Brewster angle to the fundamental wave. In the THG crystal 3, the emission plane of the third harmonic is roughly the Brewster angle to the third harmonic. |
