Patent ID: 7224461

Claim:
A method for optically evaluating a sample, the method comprising: defining a parameterized Δ∈ 2 perturbation function to represent the difference between the ∈ 2 ′ dispersion curve of the sample and the ∈ 2 dispersion curve of a similar sample having a known dopant concentration; defining a Δ∈ 1 perturbation function to represent the difference between the ∈ 1 ′ dispersion curves of the sample and the similar sample having a known dopant concentration, where the Δ∈ 1 perturbation function is defined as a Kramers-Kronig transform upon the Δ∈ 2 perturbation function; illuminating the sample with a probe beam; and detecting the reflected probe beam and generating output signals wherein said output signals can be compared to the Δ∈ 2 and Δ∈ 1 perturbation functions for evaluating the sample.