US Patent 8228960 Laser device, laser display device, and laser irradiation device

The present invention provides a laser device having a high wavelength conversion efficiency and a wide wavelength width, and is suitable as a display light source. The laser device includes a fundamental wave generating section including a laser diode which has a plurality of luminous points and a bragg reflection structure, and generating a plurality of fundamental waves which has at least a pair of wavelengths different from each other, and a nonlinear optical element having a periodic polarization inversion structure, and generating harmonics corresponding to the plurality of fundamental waves, respectively.