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  Coating Ring-down Measurement Lab elog, Page 12 of 18  Not logged in ELOG logo
ID Date Author Type Category Subject Text Attachments
  331   Fri Mar 10 16:44:13 2017 GabrieleOpticsDaily ProgressUpdated in vacuum periscope of CR0This afternoon I removed the old periscope
from CR0 and installed a new one with finely
adjustable mount, like those in the new chamber.
  
  330   Tue Mar 7 11:09:33 2017 GabrieleGeneralMeasurementsNew MIT sample #32017-03-07


11:08am,
in chamber CR0
11:09am, roughing
pump on
11:23am turbo pump on
3:37pm,
  
  329   Tue Mar 7 11:01:58 2017 GabrieleGeneralMeasurementsS1600469 S1600471 S1600481 S16004832017-03-07


10:57am,
in chamber

S1600469 in CR1
S1600471
in CR2
S1600481 in CR3
S1600483
  
  328   Fri Mar 3 13:01:59 2017 GabrieleGeneralMeasurementsNew MIT sample #22017-03-03


1:00pm,
in chamber, realigned optical lever to get
as close as possible to the edge of the disk
1:02pm,
  
  327   Fri Mar 3 13:00:50 2017 GabrieleGeneralMeasurementsS1600453 S16004902017-03-03


12:45pm,
in chamber

S1600453 in CR3
S1600490
in CR4


12:45pm
  
  326   Thu Mar 2 11:27:47 2017 GabrieleGeneralNoise huntingTurbo pump of CR0 pollutes CR1The turbo pump of the CR0 chamber runs
at 833 Hz. It causes vibrations that pollute
the measurements in the CR1-4 chamber. In
 Screenshot.png 
  325   Thu Mar 2 09:45:58 2017 GabrieleGeneralMeasurementsS1600456 S1600458 S1600461 S16004912017-03-02


9:31am,
in chamber, removed ND from path 2-4

S1600456
in CR1
S1600458 in CR2
S1600461
  
  324   Wed Mar 1 10:10:47 2017 GabrieleGeneralMeasurementsS1600469 S1600471 S1600481 S16004832017-03-01


10:10am,
in chamber, added neutral densities

S1600469
in CR1
S1600471 in CR2
S1600481
  
  323   Tue Feb 28 14:20:50 2017 GabrieleGeneralMeasurementsNew MIT sample #12017-02-28


2:19pm,
installed in CR0, balanced, with 1/2"
inserts facing down

It looks
  
  322   Tue Feb 28 11:22:35 2017 GabrieleGeneralMeasurementsS1600463 S1600466 S1600475 S16004762017-02-28


11:20am,
in chamber

S1600463 in CR1
S1600466
in CR2
S1600475 in CR3
S1600476
  
  321   Mon Feb 27 13:13:05 2017 GabrieleGeneralMeasurementsS16004902017-02-27


12:59pm,
installed in chamber CR0, balanced
1:00pm,
roughing pump on
1:13pm, turbo
  
  320   Mon Feb 27 08:42:05 2017 GabrieleGeneralMeasurementsS1600453 S16004902017-02-27


8:40am,
in chamber, balanced

S1600453
in CR1
S1600491 in CR2 (i meant
  
  319   Fri Feb 24 14:44:22 2017 GabrieleGeneralGeneralDisk modelIt's possible to build an analytical
model of the resonant frequencies of a simple
thin disk. For example, see J. Sound
 Screen_Shot_2017-02-24_at_2.37.44_PM.pngfrequency_error.png 
  318   Fri Feb 24 13:21:03 2017 GabrieleGeneralMeasurementsQ of substrates with polished edgesBelow the measured Q values of the six
Suprasil 313 substrates, with polished edges,
after annealing at 900 degrees C for 9 hours.
 8x 
  317   Fri Feb 24 11:05:58 2017 GabrieleGeneralMeasurementsS1600456 S1600458 S1600461 S16004912017-02-24


10:50am,
in chamber, balanced, added neutral density
to laser on the 1/3 path

S1600456
  
  316   Thu Feb 23 10:54:41 2017 GabrieleGeneralMeasurementsS1600523 S16005242017-02-23


10:35am
in chamber, balanced

S1600523
in bay 1
S1600524 in bay 2


10:45am,
  
  315   Wed Feb 22 15:11:59 2017 GabrieleGeneralMeasurementsS1600519 S1600520 S1600521 S16005222017-02-22


2:59pm,
in chamber, balanced, removed all neutral
densities
3:02pm, roughing pump
  
  314   Wed Feb 22 13:56:15 2017 GabrieleElectronicsConfigurationSoftware improvements
created a single interface to move
the picomotors in front of QPD1 ... QPD4

the
command qpdcenter
  
  313   Sun Feb 19 11:46:26 2017 GabrieleGeneralMeasurementsS1600458 S1600474 S16004912017-02-19


11:28am
an chamber:

S1600458 in CR1
S1600474
in CR2
S1600491 in CR3
empty
  
  312   Sat Feb 18 15:04:00 2017 GabrieleGeneralMeasurementsS1600481 S1600483 S1600469 S16004712017-02-18


9:54am in
chamber, balanced

S1600469
in CR1
S1600471
  
  311   Fri Feb 17 13:44:47 2017 GabrieleOpticsDaily ProgressSwapped picomotor and re-alignmentSince I had recurrent problems with the
picomotors used for QPD3, I swapped them
with another Newport motorized mirror that
  
  310   Thu Feb 16 10:19:33 2017 GabrieleGeneralMeasurementsS1600453 S1600456 S1600461 S16004902017-02-16


10:17am
in chamber

S1600453 in CR1
S1600456
in CR2
S1600461 in CR3
S1600490
  
  309   Thu Feb 16 10:07:59 2017 GabrieleGeneralMeasurementsS16004912017-02-16


10:06am,
in chamber CR0, balanced
10:07am,
roughing pump on
10:31am, turbo
  
  308   Thu Feb 16 09:47:29 2017 GabrieleGeneralMeasurementsSummary of coating runs carried out at Montreal


Substrate
  
  307   Tue Feb 14 15:50:23 2017 GabrieleGeneralMeasurementsS1600519 S1600520 S1600521 S1600522New substrates from Mark Optics, round,
with polished edges

2017-02-14


3:35pm
  
  306   Tue Feb 14 14:47:00 2017 GabrieleGeneralMeasurementsS16004952017-02-14


2:32pm,
in chamber (CR0), balanced
2:33pm
roughing pump on
2:45pm, turbo
  
  305   Tue Feb 14 10:55:13 2017 GabrieleGeneralDaily ProgressSomething fishy with bay 4 of the new setupI did two set of measurements with the
new coated samples from Montreal. I reshuffled
the position in the two measurements. In
  
  304   Sat Feb 11 16:22:26 2017 GabrieleMechanicsDaily ProgressTranslation stage to move retaining ringsThe ring motion up and down was not very
smooth, again due to friction on the centering
pins.
  
  303   Fri Feb 10 17:16:28 2017 GabrieleMechanicsDaily ProgressTranslation stage to move retaining ringsThis afternoon I installed the picomotor
and the translation stage that will be used
to move the retaining rings up and down.
 2017-02-10_16.32.55.jpg2017-02-10_16.33.03.jpg 
  302   Thu Feb 9 14:49:51 2017 GabrieleGeneralMeasurementsS1600489 S1600490 S1600491 S16004922017-02-09


2:30pm,
samples installed in the chamber:

S1600489 in bay 1
  
  301   Thu Feb 9 11:35:27 2017 GabrieleOpticsConfigurationQPD calibration This morning I measured the beam profiles
at the QPD positions. As expected, the beams
are not gaussian there, since we are seeing
 11x 
  300   Thu Feb 9 09:30:52 2017 GabrieleOpticsDaily ProgressTwo laser installed, setup alignedThe lasers are behaving well, there is
no high noise or wandering lines. The spectrum
below is taken in air: that explains the
 Screenshot.png 
  299   Thu Feb 9 09:10:17 2017 Gabriele, LarryElectronicsConfigurationPrivate networkI reconfigured the powerstrip and the two
Newport controllers to use static IP address
in the new 10.10.10.X network, using the
  
  298   Thu Feb 9 08:35:24 2017 GabrieleElectronicsConfigurationRemoved ESD bias path to model CR0Removed, since iit was not useful to improve
the actuation authority.

  
  297   Wed Feb 8 17:06:11 2017 Gabriele, LarryElectronicsConfigurationPrivate networkThis morning Larry set up a network switch
to create a local network for the power strip
and the two Newport picomotor controllers.
  
  296   Wed Feb 8 17:01:01 2017 GabrieleOpticsDaily ProgressTwo laser installed, setup alignedToday I swapped out the 8mW laser
and installed two 2.5 mW lasers. I rebuilt
the input part of the optical levers and
 photo_setup_new.png 
  295   Tue Feb 7 16:16:37 2017 GabrieleOpticsDaily ProgressLasersThe high power lasers I tested so far (the
Thorlabs 21mW and the JDSU 1125P) are noisy:
they both have wandering lines that from
 crime_v3.pdf 
  294   Tue Feb 7 10:03:35 2017 GabrieleGeneralMeasurementsS16004962017-02-07


10:02am
in chamber, balanced
10:03am roughing
pump on
10:30am turbo pump on
Excitations
  
  293   Mon Feb 6 16:22:47 2017 GabrieleGeneralMeasurementsS1600472 S1600478 S1600473 S1600480
In the new chamber
Excitations:


Quiet
time before excitation: 1170443490
Excitation (broad band) at 1170443523
  
  292   Mon Feb 6 14:09:07 2017 GabrieleGeneralMeasurementsFirst set of parallel measurements completedThe new laser is still acting up a bit,
with a wandering line moving sometimes inside
the band. Nevertheless, I could perform the
 results_06-Feb-2017.pngresults_2017_02_06a_CR1.pngresults_2017_02_06a_CR2.pngresults_2017_02_06a_CR3.pngresults_2017_02_06a_CR4.png 
  291   Mon Feb 6 11:19:13 2017 GabrieleOpticsDaily ProgressLaser swapThe Thorlabs laser has been misbehaving
for the whole weekend. Even after many days
being continuosly on, the wandering line
  
  290   Mon Feb 6 08:37:54 2017 GabrieleGeneralMeasurementsS16004952017-02-06


8:35am in
chamber, balanced
8:36am roughing
pump on
8:50am tubo pump on
Excitations:
  
  289   Wed Feb 1 16:58:10 2017 GabrieleGeneralCharacterizationExcitation testsThe excitation is working fine. However,
there is a large cross coupling in the excitation
between channels: so if I switch on only
  
  288   Wed Feb 1 15:35:30 2017 GabrieleGeneralDaily Progressexcitation not working - FIXEDMy bad, a cable was disconnected.




  
  287   Wed Feb 1 15:23:42 2017 GabrieleOpticsNoise huntingWandering line is due to the laserThe wandering line I mentioned in my previous
elog, which is spoiling most of the sensitivity,
turns out to be power noise of the laser. 
 laser_noise_rin.pngUntitled.avi 
  286   Tue Jan 31 16:55:17 2017 GabrieleGeneralDaily ProgressImproved autocenter, excitation not working, wandering line The autocenter script wasn't working
in a very robust way (sometimes the socket
connection to the controller failed, some
 wandering_line.pngwandering_line.png 
  285   Tue Jan 31 16:50:55 2017 Gabriele, AlenaGeneralVacuumFirst pump-down with setupThis afternoon we started the pump-down
with all the system installed into the chamber.
Unfortunately the IGM vacuum gauge isn't
  
  284   Tue Jan 31 11:21:44 2017 GabrieleMechanicsDaily ProgressRetaining ring mechanicsAll parts for the motion of the retaining
rings have been received and are ok. We're
going to clean and bake them. 
 2017-01-31_10.30.45.jpg2017-01-31_10.30.34-1.jpg 
  283   Tue Jan 31 09:03:12 2017 GabrieleElectronicsConfigurationAuto centering script for the new setupI wrote an autocenter script for the four
QPD in the new setup (autocenter14.py) and
renamed the script for the old chamber (autocenter0.py).
  
  282   Mon Jan 30 15:16:54 2017 GabrieleGeneralDaily ProgressFour samples in chamber
checked that the high voltage paths
are working:

the DAC signal
is properly received and amplified by the
 Screenshot-Untitled_Window-1.png2017-01-30_15.28.02.jpg2017-01-30_15.10.40.jpg2017-01-30_15.27.57.jpg2017-01-30_15.10.48.jpg 
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