Wavelength Tunable Dissipative Soliton Mode-locked Fiber Laser Based on Nonlinear Amplifier Loop Mirror

A figure 8 cavity wavelength tunable mode locked Ytterbium doped fiber laser based on nonlinear amplification loop mirror is reported. When pump power is 240 mW, the dissipative soliton is output with a central wavelength of 1 064.1 nm, 3 dB bandwidth of 7.7 nm, repetition rate of 18.8 MHz, optical signal noise ratio of 71.2 dB and pulse duration of 867 fs, respectively. In addition, wavelength tunable of the mode locked fiber laser at 1 032.8 similar to 1 065.1 nm and 1 037.4 similar to 1 041.9 nm can be achieved by adjusting the polarization controller and pump power respectively. The characteristics of the spectra and pulses in different mode locked states are explored, and a Gaussian pulse whose time bandwidth product is close to the Fourier transform limit is obtained. The fiber laser is simple in structure and easy to tune, and has a stable performance, which provides technical reference for achieving wavelength tunable and dissipative soliton mode-locked.