Patent ID: 9551818
Date: 2017-01-24
CPC Classifications: G02B

Claim:
1. A multilayer polymeric optical film broadband reflector comprising: a first multilayer polymeric optical film having a total number of optical repeating units from a first side to a second side of the first multilayer polymeric optical film, wherein the optical repeating units in the first multilayer polymeric optical film have a first optical repeat unit thickness that is the sum of the optical thicknesses of the constituent layers thereof, the first multilayer polymeric optical film having a first baseline optical repeating unit thickness profile and a first apodized optical repeating unit thickness profile monotonically deviating from the first baseline optical repeating unit thickness profile and defining the second side of the first multilayer polymeric optical film, wherein the first apodized optical repeating unit thickness profile is exponential; an intermediate layer on the second side of the multilayer polymeric optical film; and a second multilayer polymeric optical film having a total number of optical repeating units from a first side to a second side of the second multilayer polymeric optical film, wherein the optical repeating units in the second multilayer polymeric optical film have a second optical repeat unit thickness that is the sum of the optical thicknesses of the constituent layers thereof, the second multilayer polymeric optical film having a second baseline optical repeating unit thickness profile and a second apodized optical repeating unit thickness profile monotonically deviating from the second baseline optical repeating unit thickness profile and defining the first side of the second multilayer polymeric optical film, wherein the second apodized optical repeating unit thickness profile has an average slope at least five times greater than an average slope of the second baseline optical repeating unit thickness profile, and the first side of the second multilayer polymeric optical film on the intermediate layer, the intermediate layer separating the first multilayer polymeric optical film from the second multilayer polymeric optical film.