Couplage and CEP, posted by Blanc at Optical room about lasers and optics 
|
Pour vérifier la cohérence des mesures précédentes, j'ai fait la même analyse avec l'intensité transmise.
J'ai calculé G = (I_Lock_Trans-I_Delock_Trans)/I_Delock_Refl ainsi que la deviation standard associée, puis moyenné
et fitté, en prenant toujours en compte les barres d'erreurs. |
Verification CEP , posted by Blanc at Optical room about lasers and optics
|
On a voulu véifier que le changement de couplage induit par la CEP était une conséquence du changement de CEP dans l'oscillateur
dû au très léger déplacement angulaire de la monture de fond de cavité où il y a le SESAM et le piezo.
Pour cela, j'ai changé très légèrement l'angle vertical de la monture de fond de cavité et j'ai |
|
Modulation EOM, posted by Blanc at Optical room about lasers and optics
|
EOM dans la lockline:
Image 1 (sans 2è étage): on voit la modulation en réflexion de la cavité.
Image 2 (avec 2è étage): on voit la modulation en réflexion de la cavité et il semblerait qu'elle soit présente |
|
ip adress of smaract driver, posted by Aurélien Martens at Optical room about detectors and electronics | software
|
the ip adress of the smaract driver is now 10.0.53.10:5000
please think about putting such kind of changes in the logbook |
|
new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
|
| a cavity length measurement gave 880.9Mhz. The m1/M2 have been put to +5.1000mm both M3/M4 srill at -2.9mm |
|
new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
|
to find the fundamental mode we moved the cavity mirrors to new positions:
+5.104mm for both planar mirrors in closed loop
spherical unchanged (-2.9mm) |
|
new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
|
the M1 is not at 5.1045mm to put the fundamental on the scanning range of the laser piezo
M2 still at 5.104mm
M3/M4 at -2.9mm still |
|
new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
|
after 3hours (1pm --> 4pm) the cavity moved by 12um in total
new positions: +5.1065mm on M1 and M2 (5.1050 before)
the drift is 4um/hour which amounts to about 10kHz drift / hour+the temperature of the optics room also changed unfortunaltey (linked to extinction |
|
phone is noise, posted by Aurélien Martens at Optical room about detectors and electronics
|
doing the sensitivty measurement of the piezo we observed satellite peaks around 800 to 900 Mhz. Removing the phones from the experience room(in the
cupboard in the sas) removed that effect immediately. |