Onefive Origami 33MHz specs - Polarisation, posted by Ronic Chiche at Optical room about lasers and optics 
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one rotate a lambda/2 before a PBS and meausure the refected power:
Pmax=35.6 mW
Pmin=107 µW |
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test des vérins ISP , posted by Ronic Chiche at Optical room about mechanics | cabling | software
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* les vérins de 20mm (axe Z) ont été testés sur table grace à une rallonge SUB-C - DB9, au chassis ISP et au soft
SUPERVISEUR écrit en labwindows CVI par Didier.
pour rappel, la course soft va de -1 650 000 à +1 650 000 pour 20mm de course, soit 0.6mm pour 100 000 de course soft. |
test des vérins ISP , posted by Ronic Chiche at Optical room about mechanics | cabling | software
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Ronic
Chiche wrote:
* les vérins de 20mm (axe Z) ont été testés |
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test des vérins ISP 20mm et 6mm, posted by Ronic Chiche at Optical room about mechanics | cabling
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Après avoir utilisé la chaine : driver ISP - cable ISP DB9 - Feedthrough enceinte DB9-DB9 - cable perlé DB9-SUB-C - Capsule SUB-C,
l'ensemble de tous les vérins 6mm et 20mm ont été testés => ils fonctionnent TOUS.
Les vérins 6mm ont TOUS subis un HOME. cette commande cherche une fin de course du vérin et le place ensuite en position médianne. |
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test des vérins ISP 20mm et 6mm, posted by Ronic Chiche at Optical room about mechanics | cabling
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Ronic
Chiche wrote:
Après avoir utilisé la chaine : driver ISP - cable ISP |
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Détection de fuite, posted by Ronic Chiche at Optical room about vacuum
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Mail de Bruno Mercier du 18/10/2018 :
Un petit CR de la journée:
Nous avons effectué une détection de fuite sur l'ensemble des cavités optiques. Une fuite très importante a été |
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Remontage mécanique, posted by Ronic Chiche at Optical room about mechanics
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Mail de Yann du 12/10/2018 :
Je vous fais le bilan des actions effectuées :
1/ La mécanique a été remontée avec changement des billes céramiques, soufflet défectueux, ect... |
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Remontage des vérins, posted by Ronic Chiche at Optical room about mechanics
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Mail de Yann du 8/10/2018 :
Bonjour,
Tous les vérins sont maintenant OK ! Merci Ronic. |
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Etuvage cavité THOMX, posted by Ronic Chiche at Optical room about vacuum
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Mail de Bruno Mercier du 19/11/2018 :
Une première cavité a été étuvée, la pression est actuellement de
3.10-10 mbar, l' étuvage
de la deuxième cavité vient de commencer et se
finira en début de la semaine prochaine.
Bonne journée,
Bruno
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Alignment procedure, posted by Ronic Chiche at Optical room about mechanics | lasers and optics
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we did again the complete alignment procedure starting with iris and optimizing injection motors Ma and Mb, then installing mirror S2, S3, P4 and P1,
optimizing thetaX and thetaY axis for each motor.
everything was fine until we installed P1. we tried to optimize thetaX and thetaY of P1 and we clearly observed a strange motion when doing that |
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Finesse measurement by decay time technique, posted by Ronic Chiche at Optical room about lasers and optics
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5 Files attached:
- Note on the technique and results for the present cavity on 2019, May 21th : F ~ 18 000
- 2Tektronix scope raw data |
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New design for PDH boxes, posted by Ronic Chiche at Optical room about detectors and electronics
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A new design has been studied for the 5 PDH boxes to better match the low (33MHz) repetition rate of the ThomX laser.
the 5 PDH boxes have been modified and tested (see the attached report).
A mixer has been integrated to the PDH box for a more simple use. |
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Finesse measurement after mirror cleaning using the spin coater, posted by Ronic Chiche at Optical room about lasers and optics
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Last Finesse measurement in air : ~ 17 000 the 20th of may (see logbook)
28th and 29th of august, we cleanned, with Loïc, mirrors S3 then P1 successively using only ultra pure water with the spin coater.
we measured the finesse after each cleaning by modulation technique and in both cases, F ~ 12 500 !!! |
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Finesse measurement after mirror cleaning using the spin coater, posted by Ronic Chiche at Optical room about lasers and optics
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today I cleaned S3 with isopropanol and then with pure water on spin coater.
Finesse is only 10 700.(coupling 50% ? => to be confirmed...)
maybe we have to redo the procedure with a different way of cleanig (pushing less on the mirror ... ?) |
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Motor issue, posted by Ronic Chiche at Optical room about mechanics | detectors and electronics
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Today, Axis 9 (Z-axis of P1) has blocked the software which drives all the motors.
impossible to bypass the problem.
I had to : |
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Vessel cleanliness, posted by Ronic Chiche at Optical room about mechanics | lasers and optics | vacuum
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looking in the vessel of the FP cavity using a UV lamp shows a lot of dust... more dust than outside the cavity !!!
here is picture where one can see a cleaned zone using a finger (with gloves).
question : where does come from this dust ? |
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Finesse measurement after mirror cleaning using the spin coater, posted by Ronic Chiche at Optical room about lasers and optics
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Following finesse measurements (start @10700):
Clean P1 with SC (water) + isoprop (wipe) finesse @15000
Clean S2 with SC (water) + isoprop (wipe) finesse @13000 |
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Motor issue, posted by Ronic Chiche at Optical room about mechanics | detectors and electronics
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Today again, same problem with axis 9 blocking the controlling software during the mirror alignment procedure.
after opening the motor 9-16 controlling crate, we saw 2 screws (RX- and TX+ of the controller) which were badly screwed.
we firmly screwed them... could it be the cause ? |
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Finesse measurement, posted by Ronic Chiche at Optical room about lasers and optics
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After mirrors were going back from LMA for cleaning and thermal anealing, they have been installed in FP cavity for Finesse measurement.
after getting strange results when the cavity is closed (very low Finesse...maybe too much ethanol inside cavity procucing some lineic losses),
we get 12k-12k5 Finesse with primary vacuum (~4 mbar) and a clean lock (very flat transmission signal and quite noiseless reflection signal) |
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Finesse measurement, posted by Ronic Chiche at Optical room about lasers and optics
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To complete these observations:
Finesse has been measured on thursday, right after cleaning the cavity with ethanol @6000.
Finesse has been measured on friday, after opening the cavity for few tens of minutes @12000-12500. The cavity was openned while |