Wavelength conversion laser light source and image display apparatus

A wavelength conversion laser light source, comprising:

• a laser light source configured to generate fundamental wave laser light;
• and
• a wavelength conversion element including a wavelength conversion region configured to convert the fundamental wave laser light incident from the laser light source into different laser light in wavelength, wherein
• the wavelength conversion element has optically polished end surfaces configured to transmit or reflect the fundamental wave laser light;
• and
• a non-wavelength-converting region for the wavelength of the fundamental wave laser light is provided between at least one of the optically polished end surfaces and the wavelength conversion region, and
• the wavelength conversion element is a birefringent phase matched wavelength conversion element in which a polarization reversal direction of the wavelength conversion region is consistent, and
• a polarization reversal structure is provided in the non-wavelength-converting region.