Images obtained with phase camera while the WI RH is turned on.

1. figure attached shows the power on B4 and B1p as observed with the main diodes. The time at which the ring heater is turned on is indicated in red. The power leaking to the dark port clearly increases with the WI mirror heating up. The blue lines indicate the gpstimes at which the images shown in the following are taken. Note that the steady state is not reached for the image with ring heater on (and an unrelated unlock follows shortly after).

2. figure attached shows the power images on B4. The upper row is the situation with ring heater turned off, the lower once the ring heater is turned on for about 1 hour (as indicated in 1. figure). The images are averaged over 10 s. Slight changes in the sidebands are visible.

3. figure attached shows the power images on B1p. The images are again averaged over 10 s. Most noteworthy the 08 mode seems to reduce in intensity. A misalignment becomes visible.

4. figure shows the overlaps. The overlap of carrier with the 56 MHz sidebands is clearly reduced while the 6 MHz sidebands see much less of an effect. The overlap with the 6 MHz USB seems even to improve.

5. The sidebands and the carrier on B4 were fitted with an astigmatic Gaussian. The data is better described by the fit when the WI RH is turned on, i.e. the overlap of fit with data increases (see formula in figure). The astigmatism of the sidebands is reducing aswell (again formula in figure).