Switching of noise-like pulse and dissipative pulse state in a mode-locked dual-wavelength Yb-doped picosecond fiber laser via nonlinear polarization rotation

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Based on the principle of nonlinear polarization rotation (NPR), we propose and experimentally demonstrate a mode-locked dual-wavelength Yb-doped fiber laser. Flexible switching between the noise-like pulse (NLP) and dissipative pulse regimes can be realized through the tuning of a single polarization controller. Experimental results validate the feasibility of the proposed technique, with stable dual-wavelength operation maintained throughout both pulse states due to Raman scattering-induced Stokes shift within the fiber. Under NLP operation, the laser exhibits a maximum output power of 140.90 mW and a slope efficiency of 12.10%. The pedestal pulse widths for the two emission wavebands (1055 nm and 1104 nm) are measured as approximately 28.65 ps and 97.25 ps, respectively, while the corresponding spike pulse widths are as narrow as 0.68 ps and 0.51 ps. In the dissipative pulse state, the maximum output power further increases to 156.40 mW with a slope efficiency of 14.60%, and a pulse width of 23.61 ps is measured at 1044 nm.