Experimental Study of Figure-of-eight Fiber Lasers Based on Nonlinear Amplifying Loop Mirror
非线性放大环形镜“8”字腔光纤激光器实验研究

The experimental study of the Yb~ 3 -doped figure-of-eight cavity fiber laser using the nonlinear amplifying loop mirror (NALM) was reported, which was pumped by 976 nm semiconductor laser. The fiber laser can generate 0.2 mW average power of 43.6 ps pulse duration at a repetition of 18.2 MHz, and operating central wavelength was 1053.3 nm, spectrum width was 8 nm, though grating pairs to compensate the positive dispersion outside the cavity, as short as 616 fs output pulse was obtained after amplifying, which was to our knowledge the shortest pulse to date from this kind of Yb~ 3 -doped fiber laser.