Patent ID: 7826500

Claim:
A fiber laser comprising: a solid-state laser fiber doped with a rare earth element; a pump light source that excites the solid-state laser fiber; a reflective element having wavelength dependency; and a wavelength conversion element arranged at an output side of the solid-state laser fiber away from the reflective element at a specified distance along the solid-state laser fiber, wherein an end face of the wavelength conversion element is inclined to an optical axis, and the wavelength conversion element has birefringence, and wherein the wavelength conversion element is a uniaxial nonlinear optical crystal, the end face of the wavelength conversion element is inclined to incident light from the solid-state laser fiber, the propagation direction of the incident light is nearly orthogonal to the C-axis of the nonlinear optical crystal, and the end face is parallel to the C-axis of the nonlinear optical crystal.