Femtosecond　laser　machining　is　a　precise　process　with　minimal　thermal　effects　and　broad　material　adaptability.　While　plasma　shielding　has　been　extensively　studied　as　a　limitation,　little　attention　has　been　given　to　oxide　accumulation,　which　forms　during　laser-metal　interactions　and　hinders　material　removal.　This　study　systematically　investigates　the　influence　of　oxide　accumulation　on　the　material　removal　depth　of　GH3230　alloy　under　different　processing　environments　including　ambient　air,　argon　atmosphere,　high-pressure　airflow,　and　high-pressure　argon　gas　flow.　Results　demonstrated　that　oxide　layers,　primarily　composed　of　NiO　and　Cr2O3,　formed　in　ambient　air,　reducing　material　removal　rates　and　limiting　kerf　depth.　In　contrast,　processing　in　an　argon　atmosphere　reduced　oxygen　content　by　90%　and　increased　kerf　depth　by　38.5%.　High-pressure　gas　flow　further　enhanced　removal,　increasing　kerf　depth　by　38.7%　using　compressed　air　and　88.1%　using　compressed　argon.　These　findings　highlight　the　importance　of　controlling　oxide　formation　to　improve　femtosecond　laser　machining　efficiency　for　deep　material　removal　in　industrial　applications.　©　2025　Elsevier　B.V.