The application of broad band optical monitoring (BBOM) has been reported and demonstrated to have an error self-compensation mechanism. This report shows the alternative of narrow band optical monitoring (NBOM) to have the same or better benefits in such an application. The application reported in both cases is a Brewster Angle Polarizer in a narrow band for lasers in the 1054 to 1064 nm spectral region. Narrow band monitoring at the filter wavelength has been successfully used for the production of narrow band-pass Fabry-Perot optical interference filters since the 1950s where the self-compensation mechanism was discovered to be of major benefit. Logic would suggest that broad band monitoring should be most beneficial for broad band coatings such as broad band antireflection, spectral shaping filters over a broad band, etc. In narrow band applications, the coating properties at some spectral distance from the narrow band of interest are of little or no interest. Such is the case in the previous report and in this report; therefore narrow band monitoring is appropriate.
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