Patent ID: 8184371
Filing Date: 2012-05-22
Classification: G01N,G02B

Abstract:
1. A method for forming a thin film interference filter comprising: measuring a reflectance of a stack of a plurality of films; modeling a monitor curve at a modeled monitor wavelength for a topmost layer to be deposited on the stack of the plurality of films; depositing the topmost layer on the stack of the plurality of films; and recording a plurality of monitor curves during the deposition, each monitor curve being recorded for a different monitor wavelength of the topmost layer; wherein the topmost layer is a high index of refraction layer that exhibits a wavelength that is determined according to the characteristics of either the modeled monitor curve or one of the recorded monitor curves; and determining an anticipated standard deviation in φκ for each different monitor wavelength in the high-index of refraction layer and discarding any monitor wavelengths with σ greater than 0.9 degrees.