Patent ID: 7838309

Claim:
An apparatus, comprising: a stress measuring module for measuring stress on at least one of a monitor substrate, a production substrate, and a proxy device on a production substrate, and thereby producing stress data, wherein the stress measuring module comprises: a probe that produces a probe beam that is reflected off a measurement spot on a surface of the substrate, a pump laser that produces a pump beam that is separate from the probe beam and impinges on the measurement spot, and a spectrograph that receives the reflected probe beam and delivers the reflected probe beam to a detector array, the detector array for producing signals based on the received reflected probe beam, and a controller for receiving the signals and producing the stress data, a shape measuring module for measuring critical dimension shape on at least one of a proxy device on a production substrate and a production device on a production substrate to produce shape data, and the controller further for receiving the stress data and the shape data into an elastic deformation calculation to determine a stress value for a production device.