piezo actuation range, posted by Aurélien Martens at Optical room about lasers and optics | detectors and electronics
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A 10V applied on the laser piezo was found to induce a frequecny change of about 5kHz, compatible with expectations from the piezo sensitivity. this
was measured by a freqeuncy analysis of the signal produced by the laser itself on a photodiode det10a
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phone is noise, posted by Aurélien Martens at Optical room about detectors and electronics
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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. |
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new smaract positions, posted by Aurélien Martens at Optical room about mechanics | software
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| M1 and M2 at 5.1085mm and M3 and M4 at -2.9mm |
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new position of smaract motors, posted by Aurélien Martens at Optical room about mechanics | detectors and electronics | software
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following the measuremetn at 879.9 MHZ of the laser theoptical cavity length has been adjusted to that value from 876MHz setting of the 5th of may 21.
new motor positions:
M3/M4 : -2.9mm |
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new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
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| a cavity length measurement gave 880.9Mhz. The m1/M2 have been put to +5.1000mm both M3/M4 srill at -2.9mm |
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new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
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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) |
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new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
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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 |
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new position of smaract motors, posted by Aurélien Martens at Optical room about detectors and electronics | software
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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 |
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ip adress of smaract driver, posted by Aurélien Martens at Optical room about detectors and electronics | software
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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 |
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input and output power of the AOM 50MHz, posted by Blanc at Optical room about lasers and optics | detectors and electronics
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Input power of the AOM :
150mW
output power of the AOM : |
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Verification CEP , posted by Blanc at Optical room about lasers and optics
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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 |
Update schéma manip, posted by Blanc at Optical room about lasers and optics 
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| Le dernier schéma de la manip avec plus d'infos. |
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Theoretical Finesse, Gain and Coupling, posted by Ronic Chiche at Optical room about lasers and optics
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For spherical mirrors M3 and M4 (batch C117I054) the reflectance (R) is around 99.9987% (if T+R=1 => T=13ppm)
For plan mirror M2 (batch C217G054) the reflectance (R) is around 99.9977% (if T+R=1 => T=23ppm)
(1) => For plan mirror M1 (batch C217H023) the reflectance (R) is around 98.96% and transmittance (T) is around 1.14% (T=11400 ppm) |
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Tests et mesures lockline, posted by Blanc at Optical room about lasers and optics
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Mesures de puissance fibres lockline :
AVANT POLISSAGE
injection premier étage : 15 mW |
Tests et mesures lockline, posted by Blanc at Optical room about lasers and optics
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Blanc
wrote:
Mesures de puissance fibres lockline : |
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Taille faisceau, posted by Blanc at Optical room about lasers and optics
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J'ai fait une comparaison de la taille du faisceau sur les miroirs de la cavité pour savoir si le mauvais couplage dans la cavité était
dû à cela.
Au vue des faibles différences, cela n'explique pas le couplage si bas que l'on obtient. |
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Suite Mesures de puissance lockline, posted by Blanc at Optical room about lasers and optics
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Changement d'AOM pour passer sur l'AOM 200 MHz.
Le schéma suivant récapitule les mesures prises.
Il y a eu une chute de la puissance en sortie de la fibre bleue de la lockline. |
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Suite Mesures de puissance lockline, posted by Blanc at Optical room about lasers and optics
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Blanc
wrote:
Changement d'AOM pour passer sur l'AOM 200 MHz. |
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Setup and measurements, posted by Blanc at Optical room about lasers and optics | detectors and electronics
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To summerize the results of this week :
We made the setup in attachement 5 and align it to have the good mode in the cavity (TEM00).
With the good alignment, we found the lock of the GHz, in attachement 1. We used the motors in the cavity to position very precisely the mirrors |
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Setting up the Motors, posted by Manar Amer at Other about mechanics | cabling | software
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A document attached that describes the procedure needed to:
- connect the motors
- configure the Ethernet connection |