| 摘要 |
A laser device emits a higher harmonic wave of multi-longitudinal mode laser light and is capable of realizing higher efficiency and higher performance in a simple and economical fashion. The laser device includes a light source formed from a semiconductor laser emitting a fundamental wave in multi-longitudinal mode, and a wavelength converting element formed from a polarization inversion element provided with two or more of polarization inversion regions, and each region has a period Delta that corresponds to the longitudinal mode constructing the fundamental wave, and the higher harmonic wave obtained by the polarization inversion element is in multi-longitudinal mode.
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