A　broadband　continuously　tunable　semiconductor　disk　laser　is　reported　in　this　paper.　The　active　region　of　gain　chip　is　composed　of　InGaAs　multiple　quantum　wells　with　resonant　periodic　gain　structure,　and　its　fluorescence　peak　wavelength　is　around　965　nm.　Using　the　wideband　characteristics　of　the　quantum　wells　in　gain　chip,　along　with　the　simple　linear　cavity　that　is　formed　by　a　high　reflectivity　external　mirror,　the　laser　has　a　low　cavity　loss　and　a　wide　tuning　range.　The　continuously　tunable　laser　wavelength　can　be　obtained　by　inserting　birefringent　filters　with　different　thickness　into　the　cavity.　When　the　thickness　of　the　birefringent　filter　is　2　mm,　the　wavelength　tuning　range　of　the　laser　is　45　nm,　the　maximum　output　power　is　122　mW,　and　the　beam　quality　M-2　factors　in　the　X-　and　the　Y-directions　are　1.00　and　1.02,　respectively.　The　temperature　characteristics　of　the　surface-emitting　spectra　of　gain　chip　and　the　narrowing　effect　of　birefringent　filter　on　laser　linewidth　h　are　also　discussed.