Triple Bandpass Filter for OIC Contest
[size=+3]Triple Bandpass Filter for OIC Contest Every three years the OSA (Optical Society of America) holds a meeting called OIC (Optical Interference Coatings). As part of that meeting, there is...

[size=+3]Triple Bandpass Filter for OIC Contest


Every three years the OSA (Optical Society of America) holds a meeting called OIC (Optical Interference Coatings). As part of that meeting, there is always a design contest. The 2007 meeting has two design problems, the first of which is discussed here. The second problem is a Nonpolarizing Beamsplitter.
The challenge is to design a normal incidence bandpass filter having the requirements
Stop band 1: 350 to 380 nm, T Pass band 1: 410 to 500 nm, T > 90.0%
Stop band 2: 530 to 590 nm, T Pass band 2: 610 to 670 nm, T > 90.0%
Stop band 3: 690 to 710 nm, T Pass band 3: 730 to 740 nm, T > 90.0%
Stop band 4: 760 to 900 nm, T The substrate has index 1.45. The incident and exit mediums are air. Both sides of the substrate may be coated. The coating materials are restricted to have an index between 1.45 and 2.5. There is no limit on the number of materials or the number of layers. The total physical thickness of the two coatings must not exceed 50000 nm. Layers are required to be at least 1 nm thick. The design is to be evaluated every 0.001 nm to ensure that all requirements are met. The winning design is the one that meets the requirements and has the least total physical thickness.
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