Patent ID: 9354370
Filing Date: 2016-05-31
CPC Classification: G02B

Claim Text:
1. A thin film notch filter, comprising: a substrate; and a plurality of discrete material layers of alternating high and low refractive index deposited on said substrate; wherein said plurality of discrete material layers exhibits a spectrum comprising a pass band substantially extending from at least a first wavelength to at least a second wavelength, said pass band being interrupted only by a notch region corresponding to a non-harmonic stop band at a non-harmonic notch wavelength λ wherein said spectrum is a function of a set of electromagnetic radiation wavelengths, said set of electromagnetic radiation wavelengths comprising at least a set of visible electromagnetic wavelengths; wherein each wavelength in said set of visible electromagnetic wavelengths is greater than said first wavelength, said second wavelength is greater than or equal to 900 nm, and said second wavelength is less than or equal to 1600 nm; wherein said notch region corresponding to said non-harmonic stop band at said non-harmonic notch wavelength λ wherein said notch bandwidth at said non-harmonic notch wavelength λ wherein said pass band exhibits at least 90% transmission at all wavelengths excluding wavelengths associated with said notch region exhibiting said full width at half-maximum; wherein said plurality of discrete material layers substantially defines a fundamental stop band centered at a wavelength λ wherein said non-harmonic notch wavelength λ