Patent ID: 7755752
Filing Date: 2010-07-13
Classification: G01N,H01L

Abstract:
1. A system for evaluating a semiconductor sample comprising: two or more light sources, including at least one light source configured to generate a first output probe beam of monochromatic light and at least one light source configured to generate a second output probe beam of polychromatic light, a pump laser configured to generate a pump beam; a modulator configured to modulate the pump beam to produce an intensity-modulated pump beam, wherein the modulator is configured to modulate the pump beam at a frequency over a range from 1 Hz to 1 kHz for photoreflectance measurements and greater than 1 MHz for modulated optical reflectivity measurements; a detector configured to receive a portion of the first output probe beam that is reflected from the surface of the sample and generate a first output signal in response thereto that corresponds to a modulated optical reflectivity of the sample; a detector array configured to receive a reflected portion of the second output probe beam that is reflected from the surface of the sample and generate a second output signal in response thereto that corresponds to a photoreflectance of the sample; a processor coupled to at least one of the detector or the detector array said processor configured to evaluate the sample based on the first and second output signals.