Patent ID: 8311065

Claim:
A fiber laser system, comprising: a laser pumping source adapted to emit a pumping beam; a first wavelength reflector coupled to the laser pumping source; a second wavelength reflector; a first gain fiber coupled between the first wavelength reflector and the second wavelength reflector, wherein the pumping beam is adapted to transmit to the first gain fiber by passing through the first wavelength reflector; a first long wavelength reflector coupled between the first gain fiber and the second wavelength reflector; a second long wavelength reflector coupled between the first long wavelength reflector and the second wavelength reflector; and a second gain fiber coupled between the first long wavelength reflector and the second long wavelength reflector, wherein the diameter of the core of the first gain fiber is greater than the diameter of the core of the second gain fiber, a first wavelength beam is generated in a first resonant cavity formed between the first wavelength reflector and the second wavelength reflector after the first gain fiber is pumped by the pumping beam, a second wavelength beam is generated in a second resonant cavity formed between the first long wavelength reflector and the second long wavelength reflector after the second gain fiber is pumped by the first wavelength beam, the wavelength of the first wavelength beam is shorter than the wavelength of the second wavelength beam, the first wavelength reflector and the second wavelength reflector are adapted to reflect at least a portion of the first wavelength beam, the first long wavelength reflector and the second long wavelength reflector are adapted to reflect at least a portion of the second wavelength beam, and the material of a gain medium doped in the first gain fiber is the same as the material of a gain medium doped in the second fiber.