Optimization of the polarization has been made the 03/10/18. Checked in reflection of the cavity in reflection&transmission of a PBS, locked and unlocked. Only with 2nd stage.

Ratio values are reflection of PBS divided by transmission or the opposite.

Measurement made on 03/10/18 (nothing has been done since there).

Stable power in the cavity of 225 kW.

Motors have been installed on 16/10/18. No problem with them.

Effect of the motors tested on 17/10/18. No improvement. But they give the possibility to perfectly cut HOM or let them go through as show the following picture of a 2.2 mode at ~340 mW in trans and 70% coupling @4A.

Measurements have been done on 18/10/18.

Datas are on excel file, also matlab file.

Measurement done on 18/10/18.

At high power, the shape of the 0.0 mode does not change. The D-shape only generate losses in the cavity. Then the power stored in the cavity decrease. As with this configuration, the cavity beam size decrease when power increase, the beam size decreased.

Measurements done @4A on 3rd stage.

Then we get the D-shape away from the beam to not cut it and decreased the amplifier power to validate the beam size at a known value. So the power as been decreased to 2A (= 125 mW in trans) and the beam size was x=2079 y=2255, similar to the 125 mW with D-shape mirrors values.

Matlab code for size vs position and power : 

clear all
close all

x = [1820 1820 1925 1936 2117 2260];
y = [2013 2013 2029 2090 2249 2392];
Position = [0 0.2 0.4 0.6 0.8 1];
Trans = [337 330 306 245 128 17]

hold on
[ax,h1,h2] = plotyy(Position,x,Position,Trans)
set(get(ax(1), 'Ylabel'), 'String', 'Beam diameter (um)');
set(get(ax(2), 'Ylabel'), 'String', 'Transmitted power (mW)');
xlabel('Position of the D-shape (mm)')
plot(Position,y,'g')
hold off

Measurements of lot of points with D-shape mirrors well positionned.

Power not optimized to the best but almost. (@4A could have 350 mW).

Measurements show that ratio decrease versus power. BUT, the second resonance measurement induce lower power in the cavity so the ratio is not directly true.

Also, simulation of the main/second resonance power by Pierre's simulation has shown ratio ~50, ~47.6 and 43.5 respectively for 0A, 2A and 4A.

Check of the frequency of the onefive locked on each polarization of the cavity (tilt a waveplate by 45°).

Frequency repetition rate : 133.335 MHz on spectrum analyzer for both polarization locked.

Measurement on 30/10/18.

Measurement on 24/10/18

Measurement on 25/10/2018

Center of M1:

First finesse measurement 20 266, FSR 133.351 MHz under vacuum

The kept transmission for M4 is 2.17 ppm. Which is the value measured after alignement (center of the mirror).

These measurements have been taken before alignement.

High dependence against the position. Few measurement several mm away from the center each one at different position give 194, 193, 208, 200 ppm.

At different positions, transmission give 194, 193, 208, 200 ppm?

The new mirrors didn't give expected results. Then the 4 old mirrors have been sent to LMA on 12/11/18 for a cleaning and caracterization before and after cleaning. Also asked for a diffusion/absorption map on the mirrors if possible. They didn't really answered on what will they do. 
Received on 13/11/18 by LMA.

Mirrors arrived today from LMA. Their features are damaged.

Photos avant ou après nettoyage, pas clair dans le mail de Laurent : 

"J'ai commencé à nettoyer M1 et M2 avec notr methode habituelle et je me suis aperçu que sur la partie centrale (en gros taille de ton faisceau j'ai l'impression) que des choses apparaissaient (voir photo)
Si bien que la diffusion n'a pas évolué dans le bon sens (diminution) voir empiré pour M1. J'ai donc arrêter de les nettoyer !!!
J'ai regardé les faces arrières des miroirs avant nettoyage et j'ai pu voir ce que tu vois sur la photo même au centre. Je sais pas de quoi cela peut venir.
Une chose est sûre le coating IBS a été altéré par je ne sais quoi dans ta manip provoquant cette dégradation dès qu'on y touche. L'interaction avec les faisceaux d'eélectrons n'avait jamais altéré les miroirs sur l'expértience DESY par exemple!!
Pour me rassurer, j'ai pris un miroir fait sur un micropoli qu'on a en stock et aucun pb lors du nettoyage (on peut penser à tout)"