Patent ID: 8441710

Claim:
An optical filter comprising: at least one substrate; a first plurality of alternating first and second material layers, and a second plurality of alternating first and second material layers, each of said first and second material layers in said first and second pluralities having respectively different refractive indices wherein: said first plurality of alternating first and second material layers is configured to exhibit a first surface with a first normal vector at a first angle to a first direction of electromagnetic radiation incident on said first plurality and to exhibit a tunable cut-on edge at a first wavelength as a function of said first angle; said second plurality of alternating first and second material layers is configured to exhibit a second surface with a second normal vector at a second angle to a second direction of said electromagnetic radiation incident on said second plurality and to exhibit a tunable cut-off edge at a second wavelength as a function of said second angle; said first plurality of alternating first and second material layers exhibits a first polarization splitting at said first wavelength and a first s-stopband edge at a first s-stopband wavelength, all as a function of said first angle, for said electromagnetic radiation incident on said first plurality; said second plurality of alternating first and second material layers exhibits a second polarization splitting at said second wavelength and a second s-stopband edge at a second s-stopband wavelength, all as a function of said second angle, for said electromagnetic radiation incident on said second plurality; said first polarization splitting does not exceed approximately 1 percent of said first wavelength as a function of said first angle for any first angle with a value between approximately 0 degrees and approximately 40 degrees; said second polarization splitting does not exceed approximately 1 percent of said second wavelength as a function of said second angle for any second angle with a value between approximately 0 degrees and approximately 40 degrees; and the value of said first angle and the value of said second angle are such that said second s-stopband wavelength is approximately≦said first wavelength, which is less than said second wavelength, which is approximately≦said first s-stopband wavelength.