Ultrashort　pulse　lasers　are　widely　used　in　laser　spectroscopy,　microwave　measurements,　high-speed　sampling,　medical　diagnostics,　communication　systems,　and　many　other　fields.　This　work　presents　a　tunable　self-mode-locked　semiconductor　disk　laser,　which　is　based　on　the　combination　of　the　Kerr　effect　in　the　gain　chip　and　the　soft　aperture　formed　by　the　overlap　of　pumping　and　laser　spot.　A　linear　resonator　with　a　length　of　93　mm　is　formed　by　the　high　reflectivity　distributed　Bragg　reflector　at　the　bottom　of　the　gain　chip　and　the　external　output　coupler　with　100　mm　curvature　radium.　The　mode-locking　can　be　started　by　fine-tuning　the　size　of　the　pump　spot　and　the　length　of　the　resonator,　and　a　stable　self-mode-locked　output　can　be　achieved　at　980　nm　wavelength.　Then,　a　thickness　of　2　mm　birefringent　filter　is　inserted　into　the　resonator　at　Brewster　angle,　and　a　continuous　tuning　of　37　nm　wavelength　was　obtained　by　rotating　the　filter.　The　repetition　rate　of　achieved　stable　mode-locked　pulse　train　at　980　nm　is　1.6　GHz,　the　pulse　width　is　4.3　ps,　the　maximum　output　power　is　467　mW,　and　the　corresponding　peak　power　is　68　W.　©　2022　SPIE.