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Appl Opt. 2006 Dec 10;45(35):8907-15.

Achromatic half-wave plate for submillimeter instruments in cosmic microwave background astronomy: modeling and simulation.

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Cardiff University - Cardiff, 5 The Parade, CF24 3YB Cardiff, UK.


We adopted an existing formalism and modified it to simulate, with high precision, the transmission, reflection, and absorption of multiple-plate birefringent devices as a function of frequency. To validate the model, we use it to compare the measured properties of an achromatic five-plate device with a broadband antireflection coating to expectations derived from the material optical constants and its geometric configuration. The half-wave plate presented here is observed to perform well with a phase shift variation of < 2 degrees from the ideal 180 degrees over a bandwidth of Deltav/v approximately 1 at millimeter wavelengths. This formalism represents a powerful design tool for birefringent polarization modulators and enables its optical properties to be specified with high accuracy.

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