Instrumental polarisation at the Nasmyth focus of the E-ELT

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Table 1

Modulation scheme for E-ELT straight-through and lateral configurations.

Modulation	QWP^a	HWP^a	Measured Stokes
state	QWP^a	HWP^a	component
m	(°)	(°)	straight-through	lateral

1	out	0	Q	Q
2	out	45	−Q	−Q
3	out	22.5	−U	−U
4	out	67.5	U	U
5	45	0	−V	V
6	45	45	V	−V

Notes.

^(a)

QWP and HWP columns show the angle between the fast axis of the wave-plates and the axis of the analyser.

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