Blue　semiconductor　lasers　have　broad　application　prospects　in　fields　such　as　material　processing,　underwater　communication,　and　ocean　exploration　due　to　their　unique　wavelength　advantages.　At　present,　the　power　of　blue　light　single　tube　LDs　is　relatively　low.　By　using　incoherent　laser　beam　combining　technology　and　fiber　coupling　technology,　multiple　blue　light　LDs　can　be　synthesized　into　a　high-power　and　high　uniformity　laser,　meeting　a　wider　range　of　application　needs.　This　article　designs　a　100W　level　blue　light　LD　fiber　coupling　module,　which　uses　32　single　tubes　with　a　power　of　5W　LDs.　Through　spatial　and　polarization　beam　combining　design,　it　is　focused　and　coupled　into　105　μm/NA0.22　optical　fiber.　After　simulation　with　Zemax　software,　a　138.7　W　high　brightness　blue　laser　was　obtained,　with　a　fiber　coupling　efficiency　of　91.48%.　A　dual　axial　flow　fan　air-cooled　heat　dissipation　structure　has　been　designed.　After　simulation　with　Ansys　Icepak　software,　the　maximum　temperature　of　the　laser　module　is　35.1　℃,　and　it　can　continuously　output　light　for　operation.　©　2024　SPIE.