Patent ID: 7697577

Claim:
A wavelength conversion apparatus, comprising: an end pump fiber laser for generating a fundamental wave, the end pump fiber laser containing a laser activating substance, and including a reflecting surface at one end thereof and a fiber grating in the vicinity of the reflecting surface; an excitation laser light source for outputting excitation laser light; an excitation laser light introduction section for introducing the excitation laser light from the excitation laser light source to the end pump fiber laser from an end surface of the end pump fiber laser opposite to the reflecting surface; a wavelength conversion element for partially converting the fundamental wave generated by the fiber laser to a harmonic; and a rear reflecting surface located outside the end pump fiber laser and forming a laser cavity together with the fiber grating, wherein: the wavelength conversion element is located between the fiber grating and the rear reflecting surface; the rear reflecting surface reflects the fundamental wave transmitted through the wavelength conversion element and outputs the harmonic obtained by the wavelength conversion element; the wavelength conversion element partially converts the fundamental wave reflected by the rear reflecting surface into the harmonic; and the reflecting surface at the end of the end pump fiber laser reflects the fundamental wave.