Resonance absorber
AssigneeJenoptik Jena G.m.b.H.
InventorHubert Pohlack
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Abstract
An improvement in a resonance absorber of refractive index n and absorption coefficient k wherein a medium of refractive index n.sub.a is disposed frontally thereof is disclosed in which the thickness of the absorption material is made equal to m.lambda./(4n), where m is the whole number closest to 2na/(.pi.k) where n equals n.sub.a and wherein the interference layers have alternatingly low and high refractive indices in that order when m is even and alternatingly high and low refractive indices in that order when m is odd.
Claims6
In a resonance absorber for the absorption of impinging photons of electromagnetic radiation having an effective wavelength .lambda., said resonance absorber including (1) an absorption material of refractive index n and absorption coefficient k and having a medium of refractive index n.sub.a disposed frontally thereof;
- (2) an external optical element positioned posteriorly of said absorption material, and (3) a series of interference layers located between said absorption material and said external optical element, each of said interference layers having an optical thickness of substantially .lambda./4, and the series of layers arranged to have alternatingly low and high refractive indices, the improvement wherein:
- the thickness of said absorption material is equal to m.lambda./(4n), where m is the whole number closest to 2n.sub.a /(.pi.k), and where the refractive index n of the absorption material equals the refractive index n.sub.a of the said medium disposed frontally of said absorption material, and wherein the interference layers have alternatingly low and high refractive indices in that order when m is even and alternatingly high and low refractive indices in that order when m is odd.
Dependencies are inferred from the claim text.