Tunable dual- and triple-wavelength mode-locked all-normal-dispersion Yb-doped fiber laser open site


Date: Nov 4, 2014

A tunable dual- and triple-wavelength passively mode-locked ytterbium-doped fiber laser in the all-normal-dispersion regime is reported and demonstrated. Using a phase-shifted long-period fiber grating as an all-fiber format spectral filter in the laser cavity, a self-starting stabilized multi-wavelength mode-locking operation is achieved by nonlinear polarization evolution. The mode-locked multi-wavelength output can be tuned continuously and smoothly over a spectral range of 10 nm using the phase-shifted long-period fiber grating bandpass filter without re-adjusting any elements in the system. It opens a new possibility to achieve tunable and controllable multi-wavelength mode-locked high-energy laser output in the all-normal-dispersion cavity in an all-fiber format.