Abstract: Ultrafast lasers, with the characteristics of narrow pulse width, wide spectrum, and high peak power, have important applications in many fields such as industry, medicine, and research. The dispersion compensation was carried out in the Figure-9 laser cavity, and the laser could achieve both wide spectrum output and self-starting mode locking. When the pump power was 160 mW, the continuous light component of the spectrum disappeared. The spectral full width at half maximum (FWHM) of the output was 22.6 nm and 26.2 nm respectively, and the compressed pulse width reached 143 fs and 128 fs. Under free operation, the root mean square (RMS) of the average output laser power within 1 hour was 0.1%. The designed laser has the advantages of wide spectrum, high integration, and strong stability, which can meet the application requirements of ultrafast laser in fields such as micro-nano processing, bio-optics, and spectral detection.