Fiber femtosecond laser oscillator with fast and wide range repetition rate scanningby using dual ch

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The present invention relates to a broadband high-repetition-rate scanning femtosecond optical fiber laser resonator using a pair of chirped optical fiber bragg gratings, which is a femtosecond optical fiber laser resonator, the femtosecond laser resonator including a laser resonator consisting of optical fiber-based parts, and comprising : an optical fiber-based saturable absorber mode locking unit for implementing mode locking; a nonlinear polarization rotation mode locking unit; and a high-repetition-rate scanning unit for controlling the repetition rate of the femtosecond laser resonator. Also, the femtosecond optical fiber laser resonator is a ring-type optical fiber resonator having a ring cavity structure, comprising : a rare earth doped optical fiber for implementing a gain medium of the resonator; a diode laser for outputting light corresponding to the light absorption wavelength of the gain medium; a wavelength division multiplexer for directing light irradiated from the diode laser toward the rare earth doped optical fiber; a single mode optical fiber which serves as a Kerr medium during nonlinear polarization rotation; an optical fiber isolator for reducing optical noise and allowing pulses generated within the resonator to proceed unidirectionally; a piezo element (PZT) for stabilizing the repetition rate of the resonator; and an optical coupler constituting an output terminal.