Vertical-cavity　surface-emitting　lasers　(VCSELs)　play　a　key　role　in　the　development　of　the　next　generation　of　optoelectronic　technologies,　thanks　to　their　unique　characteristics,　such　as　low-power　consumption,　circular　beam　profile,　high　modulation　speed,　and　large-scale　twodimensional　array.　Dynamic　phase　manipulation　of　VCSELs　within　a　compact　system　is　highly　desired　for　a　large　variety　of　applications.　In　this　work,　we　incorporate　the　emerging　microfluidic　technologies　into　the　conventional　VCSELs　through　a　monolithic　integration　approach,　enabling　dynamic　phase　control　of　lasing　emissions　with　low　power　consumption　and　low　thermal　generation.　As　a　proof　of　concept,　a　beam　steering　device　is　experimentally　demonstrated　by　integrating　microfluidic　channel　on　a　coherently　coupled　VCSELs　array.　Experimental　results　show　that　the　deflection　angles　of　the　laser　beam　from　the　chip　can　be　tuned　from　0　to　2.41　under　the　injection　of　liquids　with　different　refractive　index　into　the　microchannel.　This　work　opens　an　entirely　new　solution　to　implement　a　compact　laser　system　with　real-Time　wavefront　controllability.　It　holds　great　potentials　in　various　applications,　including　optical　fiber　communications,　laser　printing,　optical　sensing,　directional　displays,　ultra-compact　light　detection　and　ranging　(LiDAR).　©　2021　OSA　-　The　Optical　Society.　All　rights　reserved.