The performance of the intensity stabilisation servo (ISS) will not be measured this week due to some problems with the servo.  I am not sure what the cause of the problems are but the servo has
problems locking.  The diffracted power as indicated in the MEDM screen, switches between two states, regardless of whether the servo is attempts to lock in either automatic or manual mode.

The relative power noise measurement is close to the reference measurement.  It is slightly better below 10 Hz and slightly better above ~5 kHz.  Both are well within the requirement for the laser.

Both the control and error signals in the frequency noise measurement are better than the reference measurement.  The error signal looks strange below about 60 Hz with a number of steps present.

The beam pointing measurement is not as good as the last one performed on August 12th, with the 1x and 1y error signals being a factor of 3 higher.  The control signal in both cases is about the
same as the previous measurement.  The power incident on the reflection photodiode is about the same.

The mode scan does not look all that different from the previous two scan measurements.  The relative peak heights look the same to the eye.  The higher mode content has increased by 2%, with the
higher order mode power increasing by 0.2%.  The cavity finesse is the same within the errors.