Patent ID: 6358359
Filing Date: 2002-03-19
Classification: H01J,H01L

Abstract:
A semiconductor processing apparatus comprising:a chamber having an opening therein; a transparent window in the opening of said chamber, said transparent window comprising a substantially planar transparent window portion and a tubular transparent window portion connected thereto and extending outwardly therefrom, said planar transparent window portion having an opening therein and said tubular transparent window portion having an open end connected in fluid communication with the opening in said planar transparent window portion, said tubular transparent window portion having a closed end opposite the open end; a substrate holder within said chamber for holding a semiconductor substrate thereon; a plasma generator for generating a plasma within said chamber and adjacent the semiconductor substrate; an optical fiber having opposing first and second ends, the first end positioned adjacent said closed end of said tubular transparent window portion such as to be optically coupled to the plasma from outside said chamber and while avoiding reflections from the semiconductor substrate; and a processor connected to the second end of said optical fiber for analyzing the plasma.