[Marc, Shalika]

While we still have issues to characterize a single LC, we tried to check how much of the polarization state space can we cover with 2 LCs.

The first one is installed with its fast axis rotated by 45deg while the second one is at 0 deg.

The first LC voltage step size was 0.5s while the second one was 0.6s.

The attached figure shows the ellipticity / azimuth angles parameters space obtained with the camera.

In theory, we should be able to fully cover this parameter space but due to the issue at low voltage with our LCs we can not.

Nevertheless, it might be enough to perform birefringence measurement.