We sometimes have a power ratio of more than 1 in our measurements. There could be several reasons for this, laser switched off between two measurements, some fluctuations after LC, etc. Hence, another BS (BS014) is added after LC to monitor some fluctuations that were not previously accounted for. I placed the power meter after 7 holes in the reflection of BS, and the camera after 15 holes from the transmission of BS. Sometimes, we require to know the size of the beam as well to take into account the power density. 

The LC voltage change from 0-3.5V, with 0.1V step. Another power meter has been incorporated into the labview, and therefore 2 new columns has been added to the saving file. The last two column have the information from mean and std of power from this power meter. 

1. After the BS with power meter in reflection and camera in transmission

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Polarization states\Fri, Nov 15, 2024 3-15-13 PM.txt

2.  Only the power meter is after LC for this measurement, just to take into account the input power at each voltage. We only care about polarization states after the BS. 

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Polarization states\Sat, Nov 16, 2024 3-40-15 PM.txt

3. Measurement with polarizer at two rotated angles (rotated about its optic axis)

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Birefringence Measurements\GTPC Polarizer\20241105\45 deg\Fri, Nov 15, 2024 4-50-37 PM.txt

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Birefringence Measurements\GTPC Polarizer\20241105\0 deg\Fri, Nov 15, 2024 6-24-29 PM.txt

4. Measurement with HWP at two rotated angles (rotated about its optic axis)

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Birefringence Measurements\Retarder\HWP\20241115\0 deg\Fri, Nov 15, 2024 8-05-03 PM.txt

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Birefringence Measurements\Retarder\HWP\20241115\38 deg\Fri, Nov 15, 2024 9-33-43 PM.txt