This is a continuous work of 3429.
We characterized the sample PBS again. The point of this measurement is to elminate systematic error, caused by poor linearity of input polarization.
Schematics, vector data and jupyter notebook can be found here.
Input beam polarization
To avoid cross-coupling of orthogonal polarization into measurement, we tuned input polarization to only S (or P) pol. The table show relation of the HWP and GTP angles and input (output from the GTP) beam power.
Orthogonal polarizations of S and P modes are smaller than the main mode by a factor of ~10^3. Therfore the contribution from this orthogonal polarization can be negligible.
|
Ø_H [degrees] |
Ø_G [degrees] |
P_in |
Mode |
|
114 |
295 |
32 uW |
|
|
114 |
205 |
7.3 mW |
S |
|
69 |
295 |
7.8 mW |
P |
|
69 |
205 |
23 uW |
|
Calibration
This table shows data to derive calibration factors of P ans S modes.
|
Mode |
Ø_H [degrees] |
Ø_G [degrees] |
V_in [mV] {data name} |
P_in (sigma) |
P_in/V_in [W/V] |
|
P |
69 |
295 |
41.5 (0.1) {135543.csv} |
7.47 mW (313.16 nW) |
0.1688 (0.0007) |
|
S |
114 |
205 |
610.2 (0.2) {131953.csv} |
6.75 mW (1.76 uW) |
1.1009e-2 (6e-6) |
|
Background |
- |
- |
-2.67 (0.14) {120349.csv} |
2.98 uW (480.84 pW) |
- |
Transmissivity
|
Mode |
V_in [mV] {data name} |
Infered P_in [mW] |
P_out |
P_out/P_in [%] |
Spec |
|
P |
606.5 (2) {134910.csv} |
7.65 |
7.17 mW (1.70 uW) |
93.7 (6) |
- |
|
S |
45.3 (2) {130913.csv} |
6.67 |
9.51 uW (1.15 nW) |
0.1424 (1) |
< 0.2 % |
Reflectivity
|
Mode |
V_in [mV] |
Infered P_in [mW] |
P_out |
P_out/P_in [%] |
Spec |
|
P |
45.0 (2) {135126.csv} |
7.59 |
7.78 uW (5.71 nW) |
0.102 (1) |
< 3 % |
|
S |
602.6 (4) {130530.csv} |
6.63 |
6.47 mW (3.16 uW) |
97.5 (1) |
- |
The estimated S-pol transmissivity T_s and P-pol reflectivity R_p were T_s = 0.1424 and R_p = 0.102 (1), which satisfy the values in the specification sheets.