EleonoraCapocasa - 18:10, Thursday 21 July 2016 (278)
Calibration of the PSD for the optical lever of filter cavity mirrors
I have calibrated the PSD used for the optical lever of the filter cavity mirrors. PSD model : PDP90A thorlab (see file attached).
I computed the calibration for 4 different values of the power (V_SUM should not exceed 4 V)
| V_SUM | Normalised_calibration |
| 1.75 V | 0.00554 m |
| 2.08 V | 0.00542 m |
| 3.3 V | 0.00539 m |
| 3.96 V | 0.00536 m |
Mean = 0.00543 m std = 0.00008 m
Normalised calibration seems reasonably independent of the power.
In order to recover the appropiate calibration ( m/V) to convert a voltage signal into a displacement of the beam on the PSD, this value shoud be dived by the measured V_SUM.
Non-image files attached to this report
