Patent ID: 8283607
Filing Date: 2012-10-09
Classification: H01L

Abstract:
1. A system for processing a substrate, comprising: a heat source, the heat source providing radiation in a first range of wavelengths; a pyrometer for measuring the temperature of the substrate disposed within a process area of the chamber by detecting radiation in a second range of wavelengths within the first range of wavelengths; and a window separating the heat source from the substrate, the window being made from a material which is transparent to radiation in the first range of wavelengths and having a single reflective coating covering an entire surface between the heat source and the substrate, the entire surface selected from only a side of the window facing the heat source, the reflective coating being reflective to radiation in the second range of wavelengths, wherein the window is effective to prevent radiation within the second range of wavelengths from being transmitted to the pyrometer, and wherein the first range of wavelengths is between about 400-4000 nm and the second range of wavelengths is between about 700-1000 nm and wherein the window having the reflective coating is effective to prevent radiation from the heat source within the second range of wavelengths from being transmitted through a substrate at temperatures below about 400° C. and wherein the reflective coating has a transmittance ratio of reflectance to transmission of light in the second range of wavelengths of at least 1000.