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ID Date Authordown Type Category Subject Text Attachments
  8692   Mon Jun 10 21:39:26 2013 AnnalisaUpdateGreen LockingY arm locked with green but bad mode matching 
Still no good locking! 
  
  8695   Wed Jun 12 01:56:58 2013 AnnalisaUpdateGreen LockingY arm locked with green but bad mode matching 
 For the mode matching calculation
I was using the ETMY focal length that I
 waistVaryingLensPos.pdfgreen.JPGModeMatchingY.pdf 
  8696   Wed Jun 12 22:48:10 2013 AnnalisaUpdateGreen LockingY arm locked with green but bad mode matchingAfter restoring alignment I could see again
strong 00 flashes (about 250-300 counts on
ALS-TRY). So I locked the arm with IR and
  
  8699   Thu Jun 13 10:57:36 2013 AnnalisaUpdateGreen LockingY arm locked with green but bad mode matching> > Hmmm.  You seem to be saying that more
light is reflected than is injected. Is this
a units problem? Or was some IR on the power
  
  8704   Thu Jun 13 23:28:40 2013 AnnalisaUpdateGreen LockingY arm locked with green but bad mode matching

    

       
            
  
  8715   Mon Jun 17 23:53:03 2013 AnnalisaUpdateGreen LockingY arm locked on green!!Y
arm locked on green carrier in 00 mode!
It
locked at almost 280 cts, and the transmitted
  
  8734   Thu Jun 20 17:47:44 2013 AnnalisaConfigurationSUSETMY oplev servo[Jenne, Annalisa]
The ETMY Oplev servo didn't work
properly, when it was activated the ETMY
  
  8749   Tue Jun 25 23:49:04 2013 AnnalisaUpdateSUSETMY OplevI had some problem with the Oplev Servo
today. I was working at the mode matching
fine tuning and I left the Oplev servo enabled
  
  8751   Wed Jun 26 00:15:51 2013 AnnalisaUpdateGreen LockingETMY - green locking and beat note setup[Koji, Annalisa]
Alignment improving

    The alignment of the green
  
  8768   Thu Jun 27 17:41:08 2013 AnnalisaUpdateGreen LockingETMY -beat note found! 
 Y
 beat_note.JPG 
  8792   Wed Jul 3 01:49:46 2013 AnnalisaUpdateGreen LockingALS servo configuration[Koji, Annalisa, Manasa]
Today we worked on the ALS servo
stabilization for the Y arm.
 ALSALS_calibrated 
  8793   Wed Jul 3 03:06:29 2013 AnnalisaUpdateGreen LockingALS servo configuration 
I realized that I cannot open the
attached plots. I'll fix them tomorrow.
  
  8819   Wed Jul 10 02:28:04 2013 AnnalisaUpdateGreen LockingBeat notes lost![Manasa, Jenne, Annalisa]
I was going to find the beat note
to start the cavity scan, but I couldn't.
  
  8821   Wed Jul 10 11:44:02 2013 AnnalisaUpdateGreen LockingY beat note found!I found the beat note for the Y arm. Nothing
was changed with respect to yesterday night,
but the beat is back!
  
  8831   Thu Jul 11 14:38:38 2013 AnnalisaUpdateGreen LockingY arm cavity scanYesterday I did a cavity scan with IR while
holding the Yarm with green.
ALS
 IRlocked_res_mot_0710.pdfArmScanN5.pngCavityScanETMYmis 
  8842   Sat Jul 13 03:27:20 2013 AnnalisaUpdateGreen LockingY arm caity scanI started doing a scan of the Y arm cavity
with IR with ALS enabled.
ALS
 PowerSpectrum0712ScanCavityAligned.pdfScanCavityMisPitch.pdfScanCavityMisYaw.pdf 
  8844   Sun Jul 14 18:19:00 2013 AnnalisaUpdateGreen LockingArm cavity scanYesterday evening Nic and me were in the
lab. The Mode Cleaner was unlocked, but after
many attempt we could fix it and we did many
  
  8886   Mon Jul 22 03:09:51 2013 AnnalisaUpdateGreen LockingY Arm cavity scanYesterday and today I was in the lab doing
many cavity scan.
First I did many measurement with
 Screenshot-scan3_0722.pdf_-_Adobe_Reader.png 
  8910   Tue Jul 23 19:37:08 2013 AnnalisaUpdateendtable upgradeEnd table picture

    

       
            
 IMG950073.jpgIMG950072.jpg 
  8930   Sun Jul 28 19:39:04 2013 AnnalisaUpdateendtable upgradePicture Yend table picture updated on the wiki
page
  
  8931   Sun Jul 28 20:13:41 2013 AnnalisaUpdateGreen LockingY Phase tracker calibrationI did a calibration measurement for the
Y part of the BeatBox using a Marconi. This
is in order to get a more accurate calibration
 YbeatBox_Calibration.pdf 
  14041   Fri Jul 6 12:12:09 2018 AnnalisaConfigurationThermal CompensationThermal compensation setupI tried to put together a rudimentary heater
setup. 

As a heating element, I used the
 IMG_1887.jpgIMG_1884.jpgIMG_1883.jpgIR20180706_0358_labels.png 
  14043   Sat Jul 7 19:50:38 2018 AnnalisaConfigurationThermal CompensationStudy about the Thermal projection setup and its effect on the cavityI made some simulation to study the change
that the heater setup can induce on the Radius
of Curvature of the ETM.
 6x 
  14050   Tue Jul 10 23:44:23 2018 AnnalisaConfigurationThermal CompensationHeater setup assembly[Annalisa, Koji]

Today both the heater and the reflector
were delivered, and we set down the setup
 8x 
  14071   Fri Jul 13 23:39:46 2018 AnnalisaConfigurationThermal CompensationThermal compensation setup - power supply[Annalisa, Rana]

In order to power the heater setup
to be installed in the ETMY chamber,
 IMG_2012.jpgIMG_2013.jpg20180713_213818.jpg 
  14081   Wed Jul 18 03:14:48 2018 AnnalisaUpdateGeneralVent 80 recovery[Gautam, Johannes, Koji, Annalisa]

Tonight we increased the power
of the PSL laser and we achieved the lock
  
  14476   Fri Mar 8 08:40:26 2019 AnjaliConfiguration Frequency stabilization of 1 micron sourceThe schematic of the homodyne configuration
is shown below.

Following are the list of components
 Homodyne_setup.png 
  14479   Thu Mar 14 23:26:47 2019 AnjaliUpdateALSALS delay line electronicsAttachment #1 shows the schematic of the
test setup. Signal generator (Marconi) was
used to supply the RF input. We observed
 test_setup_ALS_delay_line_electronics.pdf 
  14481   Sun Mar 17 13:35:39 2019 AnjaliUpdateALSPower splitter characterizationWe characterized the power splitter ( Minicircuit-
ZAPD-2-252-S+). The schematic of the measurement
setup is shown in attachment #1. The network/spectrum/impedance
 Measurement_setup.pdfTotal_loss.pdfAmplitude_unbalance.pdfPhase_unbalance.pdf 
  14482   Sun Mar 17 21:06:17 2019 AnjaliUpdateALSAmplifier characterisationThe goal was to characterise the new amplifier
(AP1053). For a practice, I did the characterisation
of the old amplifier.This test is similar
 Gain_measurement.pdfAmplifier_gain.pdfnoise_measurement.pdfnoise_characterisation.pdf 
  14504   Sun Mar 31 18:39:45 2019 AnjaliUpdateAUXAUX laser fiber moved from AS table to PSL table

Attachment #1 shows the schematic
of the experimental setup for the frequency
noise measurement of 1 um laser source.
 Schematic_of_experimental_setup_for_frequency_stabilisation_of_1_micron_source.png1_micron_setup_for_frequency_noise_measurement.JPG1_micron_setup_for_frequency_noise_measurement_power_levels.png 
  14518   Fri Apr 5 11:40:57 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron source
Attachment #1 shows the present
experimental setup. The photodiode is now
replaced with PDA255. The farther end of
 Modified_experimental_setup.JPGChecking_polarisation.pdfChecking_the_polarisation_alignment_of_the_delay_fiber.pdfSetup_to_test_the_polarisation_alignment_of_delay_fiber.JPG 
  14520   Sat Apr 6 02:07:40 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron source
The alignment of the output beam
from the delayed path of MZI to the photodetector
was disturbed when we did the polarisation
  
  14529   Wed Apr 10 00:33:09 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron source
Attachement #1 shows the input
(ch4-green) modulation frequency and
the photodiode output (ch1-yellow) when the
 Modulation_frequency_100Hz.jpgModulation_frequency_30Hz.jpgModified_setup.JPG 
  14534   Thu Apr 11 09:05:06 2019 AnjaliUpdateIOOSpooled fiber
Attchment #1,2,3 and 4 shows the
results with frequency modulation of 32 Hz,
140 Hz , 300 Hz and without frequency modulation.
 Frequecy_modulation_32_Hz.pdfFrequecy_modulation_140_Hz.pdfFrequecy_modulation_300_Hz.pdfWithout_modulation.pdfNew_fiber_spool.JPG 
  14540   Fri Apr 12 01:22:27 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron sourceThe alignement was disturbed after the
replcement of the beam splitter. We tried
to get the alignment back . But we are
  
  14571   Thu Apr 25 03:32:25 2019 AnjaliUpdateFrequency noise measurementMZ interferometer ---> DAQ
Attachment #1 shows the time domain
output from this measurement. The contrast
between the maximum and minimum is better
 Time_domain_output.pdfFrequency_noise.pdfschematic_heterodyne_setup.pngNoise_budget_1_micron_in_Hz_per_rtHz.pdf 
  14576   Thu Apr 25 15:47:54 2019 AnjaliUpdateFrequency noise measurementHomodyne v HeterodyneMy understanding is that the main advantage
in going to the heterodyne scheme is that
we can extract the frequecy noise information
 Experimental_setup.JPG 
  14578   Thu Apr 25 18:14:42 2019 AnjaliUpdatePSLDoor brokenIt is noticed that one of the doors (door
# 2 ) of the PSL table is broken. Attachement
#1 shows the image
 IMG_6069.JPG 
  14579   Fri Apr 26 12:10:08 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron sourceFrom the earlier results with homodyne
measurement,the Vmax and Vmin
values observed were comparable with
 Time_domain_data.pdfFrequency_noise_from_data_in_linear_region.pdf 
  14586   Tue Apr 30 17:27:35 2019 AnjaliUpdateFrequency noise measurementFrequency noise measurement of 1 micron sourceWe repeated the homodyne measurement to
check whether we are measuring the actual
frequency noise of the laser. The idea was
 Homodyne_repeated_measurement.zip 
  14616   Fri May 17 10:12:07 2019 AnjaliSummaryEquipment loanBorrowed componentI borrowed one Marconi (2023 B) from
40 m lab to QIL lab.
  
  13686   Mon Mar 19 07:37:00 2018 Angelina PanSummary Proposed QPD Optical ArrangementI am currently working on an optical arrangement
consisting of a QPD that measures the fluctuations
of an incoming HeNe laser beam that
 angelinaCode.py.tar.bz2 
  13699   Thu Mar 22 17:47:16 2018 Angelina PanSummary Proposed QPD Optical Arrangement   IMG_0869.jpg 
  64   Mon Nov 5 22:24:38 2007 Andrey, SteveOmnistructureVACPumping down goes smoothly
We (Steve and Andrey) started pumping down
at 3.25PM today. At 9 PM we turned off the
  
  489   Tue May 20 18:33:01 2008 Andrey, JohnConfigurationIOOMode Cleaner is locked again
It was noticed by Mr.Adhikari earlier today
that the MC became unlocked at about 11AM.
  
  11   Wed Oct 24 01:43:32 2007 Andrey RodionovOtherGeneralPDF-file -> Will report about first results for XARM during Wednesday meeting
Here is  the pdf-file with some graphs showing
first results for XARM optimization.
 Andrey_October_24.pdf 
  38   Wed Oct 31 10:31:23 2007 Andrey RodionovRoutineVACVenting is in progress
We (Steve, David, Andrey) started venting
the vacuum system at 9.50AM Wednesday morning.
  
  41   Wed Oct 31 19:26:08 2007 Andrey RodionovRoutineGeneralPhotographs of "Mode-Cleaner Entrance"
Here are the pictures of "inside the chamber".
 9x 
  46   Thu Nov 1 16:34:47 2007 Andrey RodionovSummaryComputersLimitation on attachment size of E-LOG
I discovered yesterday when I was attaching
photos that it is NOT possible to attach
  
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