High-resolution, high-sensitivity, ground-based solar spectropolarimetry with a new fast imaging polarimeter - I. Prototype characterization

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Table 2

Properties of the optical components in FSP modulator.

Property	FLC1	SR1	FLC2	SR2	Unit

Retardance^a	0.482	0.283	0.453	0.576	λ
Switching ang.^a	41.5	–	42.6	–	°
C_d (x10⁷)	1.41	0.25	1.41	0.46	nm³
λ₀	451.9	510.8	434.2	517.7	nm
Position ang.^b	−71.8	26.7	−41.5	64.8	°

Notes. C_d and λ₀ are model parameters fitted to reproduce the measured dispersion of the retardances at 40 °C (see text). The position angles are the optimum to maximize achromatism and balance of the polarimetric efficiencies in the 400–700 nm wavelength range.

^(a)

Measured at 460 nm and 40 °C.

^(b)

Defined with respect to the optical axis of the polarizer beam-splitter cube, for the transmitted beam.

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