Patent ID: 6797529
Filing Date: 2004-09-28
Classification: G01B

Abstract:
A wafer processing apparatus comprising:a processing chamber, a stage on which a wafer to be processed is placed in said processing chamber, a process gas feed mechanism which feeds a process gas into said processing chamber, a process gas exhaust mechanism which exhausts the process gas fed into said processing chamber, and a measuring unit provided in an area on which said wafer is placed in said stage, for measuring a thickness of a film or a depth of a portion processed in a wafer surface using an optical interferometer, said measuring unit comprising: an irradiator which irradiates a measuring light from a back of said wafer so that said measuring light is totally reflectable from both first and second surfaces formed on surface sides of the wafer; and a measurement unit which causes reflected lights of said measuring light irradiated by the irradiator and reflected from said first and second surfaces to interfere with each other to thereby measure a distance between said first and second surfaces.