Patent ID: 7847937
Filing Date: 2010-12-07
Classification: G01N

Abstract:
1. An optical measurement system comprising: a rotating element ellipsometer configured to deliver a probe beam to a measurement spot on a sample and to measure one or more ellipsometric parameters of the sample at one or more discrete wavelengths or wavelength ranges, wherein the rotating element ellipsometer includes a rotating optical element that is configured to modulate a polarization of the probe beam; an optical system configured to provide a modulated pump beam coincident or near to the measurement spot on the sample; a detection system optically coupled to the ellipsometer, wherein the detection system is configured to measure standard ellipsometric signals and/or signals due to effects of the modulated pump beam on one or more sample properties; and a signal analyzer configured to extract one or more properties of the sample from the standard ellipsometric signals, the parameters derived from the signals due to effects of the modulated pump beam, or both wherein the detection system is configured to receive signal radiation that is produced as a result of interaction involving the probe beam and the sample at the measurement spot at a plurality of detector elements, wherein each detector element is a non-charge-coupled device configured to generate a pixel signal in response to a different corresponding part of a spectrum of the signal radiation, whereby the detection system generates a plurality of pixel signals, wherein the signal analyzer includes a plurality of lock-in amplifiers, wherein each lock-in amplifier is coupled to receive a pixel signal from a corresponding detector element and wherein each lock-in amplifier is configured to receive the reference signal from the modulator.