Patent ID: 7873080

Claim:
A wavelength-tunable mode-locked fiber laser system, comprising: an optical cavity introducing a pump light beam therein, outputting an output laser pulse having an adjustable principal wavelength, and comprising: a short-wavelength-pass filter producing an intracavity laser pulse; a polarization controller; an optical gain fiber; and a fiber having a length, and connecting the short-wavelength-pass filter, the polarization controller and the optical gain fiber in series, wherein: the optical cavity has an anomalous dispersion range and a net group-velocity dispersion being within the anomalous dispersion range due to the length of the fiber; the optical cavity causes the intracavity laser pulse to propagate therein for providing the output laser pulse and providing a first laser pulse, a second laser pulse and a third laser pulse to the short-wavelength-pass filter, the polarization controller and the optical gain fiber respectively; the short-wavelength-pass filter has a cutoff wavelength and filters out any light of the first laser pulse having a wavelength longer than the cutoff wavelength for adjusting the intracavity laser pulse; the polarization controller adjusts the second laser pulse to a co-polarization state for producing a fourth laser pulse; and the optical gain fiber uses the pump light beam for amplifying the third laser pulse; wherein: the optical cavity is a linear cavity; and the optical cavity further comprises: a first optical reflection component; and a second optical reflection component, wherein: the intracavity laser pulse propagates for further providing a fifth and a sixth laser pulses to the first and the second optical reflection components respectively; the first optical reflection component reflects any light of the fifth laser pulse in the linear cavity having a propagating direction opposite to that of the pump light beam, and transmits the pump light beam into the linear cavity; and the second optical reflection component partially reflects any light of the sixth laser pulse in the linear cavity having a propagating direction the same with that of the pump light beam, and outputs the output laser pulse.