Birefringence mitigation (cavity)
ShalikaSingh - 21:59, Monday 29 January 2024 (3416)
LC calibration

[Shalika, Katsuki]

In the cross polarizer configuration, we calibrated both the liquid crystals by placing the liquid crystal in between the two polarizers.

The liquid crystals were rotated and the voltage scan was done at each position. The voltage scans were done from 0 to 25V with 0.6 Hz sweep frequency of the saw tooth voltage.

The fast axis of LC1 is at 44.15. Hence it is kept at 89.15, which is 45° with its fast axis. see LC1 Fast axis plot.

The fast axis of LC2 is at  74.86. This LC is kept at its fast axis position. see LC2 Fast axis plot and retardance plot at fast axis position.

The retardance with respect to voltage was also measured for both the LC.

folder_name = r'C:\Users\atama\OneDrive\LC-Experiment\Measurement Data\LC1_calibration data\20242901_LCcal\fast axis'
folder_name = r'C:\Users\atama\OneDrive\LC-Experiment\Measurement Data\LC2_calibration data\20240129_LCcal\fast axis'