US Patent 7911683 Harmonic generator

A harmonic wave oscillating system includes a solid-state laser oscillator, a converting waveguide converting a wavelength of a laser light oscillated from the solid-state laser oscillator to oscillate a harmonic wave, an incident-side end face of the laser light, an emitting-side end face of the harmonic wave, a first side face and a second side face. The emitting-side end face includes a polished surface 6 formed on the side of the first side face 1a and a light scattering surface formed on the side of the second side face 1b. The first side face 1a and polished surface 6 are intersected at an obtuse angle θ, and the second side face 1b and light scattering surface 5 are intersected at an obtuse or right angle α.