Fig. 2
Top: phase shift angle as a function of frequency for the NIKA HWP. The transmission for the two NIKA frequency bands at 1 (blue) and 2 (cyan) mm are also plotted for illustration. Bottom: spectral transmission of the NIKA HWP for different angles. The red curve corresponds to the best-fit model for the intermediate angle data. The maximum transmission corresponds to an angle of 46.8° with respect to the HWP zero (optical axis). Attenuated spectra at 72°, 79°, and 86.4° (top to bottom curves) are also shown.
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