Patent ID: 8573151

Claim:
A microwave plasma processing apparatus comprising: a process chamber defining a process space in which an object can be plasma-processed; a gas supply unit for supplying a predetermined gas into the process chamber; an antenna for supplying microwaves into the process chamber; and a dielectric window which maintains the process chamber to be airtight and propagates the microwaves supplied through the antenna, wherein: the dielectric window comprises a ceramic member of which surface has irregularities, the irregularities being represented as a peak-to-valley value, the ceramic member being formed of alumina; and a planarization insulation film formed on the surface of the ceramic member and planarizing the surface of the ceramic member by filling up the irregularities, the planarization insulation film facing the process space; wherein the planarization insulation film is formed by baking a SiO containing film.