Patent ID: 8456734

Claim:
A wavelength conversion laser light source, comprising: a laser medium configured to generate fundamental wave light; a laser resonator configured to cause laser oscillation of the fundamental wave light; a wavelength convertor including (i) a wavelength converting region to convert the fundamental wave light under the laser oscillation caused by the laser resonator into converted light of a different wavelength, (ii) an emission end surface from which the converted light is emitted, and (iii) an incident end surface on which the fundamental wave light is incident; and an excitation laser light source configured to excite the laser medium, wherein the laser resonator includes (i) at least one reflecting surface which reflects the fundamental wave light, (ii), a first reflecting film, which is provided on the emission end surface to reflect the fundamental wave light, and (iii) a second reflecting film situated on the incident end surface on which the fundamental wave light is incident, wherein the wavelength converting region is situated between the at least one reflecting surface and the first reflecting film, wherein the wavelength convertor includes a periodic first polarization reversal structure formed in the wavelength converting region, and a non-converting region including (i) a first non-converting region formed between the first reflecting film and the wavelength converting region and (ii) a second non-converting region formed between the second reflecting film and the wavelength converting region, and wherein the non-converting region does not convert the fundamental wave light into the converted light.