To　generate　a　broader　spectrum，higher　power，and　a　more　streamlined　white　light　supercontinuum　output，this　research　investigates　the　application　of　self　Q-switching　technology　in　producing　high-power　white　light　supercontinuum　through　stimulated　Brillouin　scattering（SBS）and　Rayleigh　scattering　（RS）mechanisms　in　optical　fibers.　The　experimental　setup　employed　a　semi-open　cavity　structure　comprising　ytterbium-doped　fiber，photonic　crystal　fiber，and　high-reflectivity　grating.　Without　external　pulse　modulation，the　study　successfully　achieved　a　high-power　white　light　supercontinuum　spectrum　spanning　410-1　700　nm，with　an　output　power　of　24　W　and　a　repetition　frequency　of　188.　7　kHz　at　a　pump　power　of　97.　4　W.　The　light-to-light　conversion　efficiency　reached　24.　6%.　These　findings　demonstrate　that　the　white　light　supercontinuum　fiber　laser　based　on　the　SBS　self　Q-switching　mechanism　represents　a　novel　light　source　with　significant　advantages，including　a　simplified　structure，extensive　spectral　range，and　superior　spectral　uniformity.　The　research　provides　an　innovative　design　approach　for　developing　high-power　white　light　supercontinuum　spectral　light　sources.　©　2025　Chinese　Academy　of　Sciences.　All　rights　reserved.