Patent ID: 7271394
Filing Date: 2007-09-18
Classification: G01J,G01N

Abstract:
1. A reflectometer which operates at wavelengths that include at least some wavelengths below deep ultra-violet (DUV) wavelengths, the reflectometer comprising: a plurality of environmentally controlled chambers, the chambers sufficiently controlled to allow transmission of light wavelengths below DUV, at least one of the chambers configured to hold a sample from which reflectance data is desired to be collected; a light source that creates light including wavelengths below DUV wavelengths, the light being utilized to create at least one light beam in the reflectometer that travels through at least a portion of the plurality of environmentally controlled chambers, at least a portion of the light beam being a collimated light beam at a location where the light beam passes between at least two of the environmentally controlled chambers; and a detector that receives the reflectance data, the detector detecting data for wavelengths that include at least wavelengths at or below DUV.