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  40m Log, Page 156 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  4413   Fri Mar 18 16:06:30 2011 kiwamuUpdateGreen LockingRe: Y arm plan for todayWe use
Alberto's laser for the Y end Green Locking.
  
  4414   Fri Mar 18 16:31:11 2011 Suresh UpdateGreen LockingRe: Y arm plan for todayThe
reason for using Alberto's laser is that
some amount of work has already gone into
  
  4416   Fri Mar 18 17:55:58 2011 SureshConfigurationGreen LockingWork Plan for Y-end Aux laser installationA rough
time-table and the various tasks are given
below: 
  
  4419   Mon Mar 21 16:49:11 2011 kiwamuSummaryGreen Lockingplan for this week- Plan for this
week
  
  4420   Mon Mar 21 18:34:10 2011 kiwamuUpdateGreen Lockingadded a new ADC channel on 1X9I added a new ADC channel for a DC signal
from the X end green PD.
 aa_board_1X9.jpg 
  4421   Tue Mar 22 00:01:25 2011 kiwamuSummaryGreen Lockingplan for daytime tasksSome
tasks for the daytime tomorrow.
  * Beam profile measurements
  
  4422   Tue Mar 22 00:03:29 2011 BryanConfigurationGreen LockingPSL vs Y arm laser temperature pairing OK. Today we did the same type of
measurement for the Y arm laser as was done
for the X arm laser here: 
 PSL_vs_Y_arm_Temperatures.png 
  4423   Tue Mar 22 00:23:20 2011 JenneConfigurationGreen LockingPSL vs Y arm laser temperature pairing


   
        
            
  
  4424   Tue Mar 22 16:39:51 2011 kiwamuUpdateGreen Lockingcomaprator installed : 80 pm residual displacement A
comparator has been installed before the
MFDs (mixer-based frequency discriminator)
 noise_curve20110322.png 
  4425   Tue Mar 22 19:03:45 2011 BryanConfigurationGreen LockingPSL vs Y arm laser temperature pairing

    

       
            
  
  4426   Wed Mar 23 00:51:47 2011 kiwamuUpdateGreen Lockingplan for tomorrow  -
Plan for tomorrow
    * Video cable
  
  4427   Wed Mar 23 05:11:08 2011 kiwamuUpdateGreen Lockingservo handig offSucceeded
in handing off the servo from the green to
 stripTransit_edit.pngnoise_curve20110322_hUGF.png 
  4428   Wed Mar 23 08:50:36 2011 AidanUpdateGreen Lockingservo handig offNicely done!
 

 green-to-red.jpg 
  4435   Wed Mar 23 19:16:17 2011 AidanSummaryGreen LockingY-END green equipment is all availableWith the exception of a 2" mirror
mount, I've confirmed that we have everything
for the Y-end green production and mode-matching.
 three-quarter_inch_pedestal.jpg 
  4436   Thu Mar 24 01:16:19 2011 SureshSummaryGreen LockingY-END green equipment is all availableThere was a 2" mirror mount among the spares
on the PSL table.  It has a window LW-3-2050
UV mounted in it.  I
  
  4437   Thu Mar 24 13:50:30 2011 BryanConfigurationGreen LockingY arm laser Just a quick update... the Lightwave
laser has now been moved up to the end of
the Y arm. It's also been mounted on the
 IMG_0188.JPGIMG_0190.JPG 
  4439   Thu Mar 24 15:30:59 2011 BryanConfigurationGreen LockingPSL vs Y arm laser temperature pairingFine-grained temperature  Temp_Beating_Day02_html_m2d719182.jpg 
  4440   Thu Mar 24 16:33:32 2011 BryanConfigurationGreen LockingPSL vs Y arm laser temperature pairingX_arm and Y_arm vs PSL  PSL_vs_X-end_T_data_fine.jpg 
  4441   Thu Mar 24 19:48:13 2011 Aidan, KiwamuUpdateGreen LockingDesigns for permanent electronics for ALSKiwamu and I looked at all the electronics
that are currently in place for the green
locking on the X-arm and have made a set
 GreenLockingElectronics.pdfGreenEndPDHsupportboxandLO.pdfVertexBeatnoteAmplifierandComparator.pdfMixerFrequencyDiscriminator.pdf 
  4442   Fri Mar 25 01:27:29 2011 mevansFrogsGreen Lockingdigital frequency countingToday we tried the Schmitt trigger DFD,
and while it works it does not improve the
noise performance.  At least part of
  
  4444   Fri Mar 25 11:16:19 2011 josephbFrogsGreen Lockingdigital frequency countingI modified
the c1gfd.mdl simulink model.  I made
a backup as c1gfd_20110325.mdl. 
 C1GFD.png 
  4448   Mon Mar 28 16:24:35 2011 kiwamuUpdateGreen Lockingpower budget on PSL table   I measured some laser powers
associated with the beat-note detection system
 RFPD.png 
  4449   Mon Mar 28 17:06:15 2011 kiwamuUpdateGreen Lockinga mixer schoolIn
the last week Matt and I modified the MFD
 mixers.png 
  4450   Mon Mar 28 18:13:32 2011 ranaUpdateGreen Lockinga mixer schoolUsing 2 dBm for a Level 7 mixer is so bogus,
that I will dismantle this as soon as I come
over.
  
  4451   Mon Mar 28 18:22:43 2011 kiwamuUpdateGreen Lockinga mixer schoolPLEASE DO
NOT DISMANTLE THE SETUP ! 
  
  4464   Wed Mar 30 19:43:33 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingRight. I've got a whole load of info and
data and assorted musings I've been saving
up and cogitating upon before dumping it
  
  4465   Wed Mar 30 19:54:19 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching   laser_output_non_circular.png 
  4466   Wed Mar 30 20:08:34 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep 2: Getting the beam  Beam_Matching_02c_Vertical.pngBeam_Matching_02c_Horizontal.png 
  4467   Wed Mar 30 20:14:17 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingAdditional:   
  4468   Wed Mar 30 20:31:30 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep   
  4469   Wed Mar 30 20:50:43 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep  After_Faraday.pngAfter_Faraday_and_Rotated_Lens.png 
  4470   Wed Mar 30 21:21:15 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matchingStep 4: Matching into  Oven_Lens_Solution_66mm.pngMatching_Into_Green_Oven_zoomed_out.pngMatching_Into_Green_Oven_zoomed_in.png 
  4471   Wed Mar 30 21:43:31 2011 Aidan, KiwamuSummaryGreen LockingCalculation of the green contrast on the RF PDSkip to final thought ...
Kiwamu and I have set about measuring
the contrast of the signal on the RF PD.
  
  4472   Wed Mar 30 21:46:10 2011 Aidan, KiwamuUpdateGreen LockingStates of the Green beat noteThe attached table shows the amplitude
of the green beat note when the end laser
was in various states. We can increase the
  
  4473   Thu Mar 31 02:59:49 2011 KojiConfigurationGreen LockingThe wonderful world of mode-matching I went through the entries.
1. Give us a photo of the day. i.e.
Faraday, tilted lens, etc...
  
  4476   Thu Mar 31 14:10:00 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching

    

       
            
 P3310028.JPGP3310029.JPG 
  4477   Thu Mar 31 15:23:14 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching

    

       
            
 Zoomed_out_fitting01.pngZoomed_in_fitting01.png 
  4479   Thu Mar 31 20:37:10 2011 AidanSummaryGreen LockingRF amplitude source I gutted one of the $2 red laser
pointers to build a laser source whose amplitude
we could modulate at RF frequencies. Basically,
 P1000543.jpgP1000544.jpgP1000545.jpg 
  4480   Thu Mar 31 20:46:11 2011 AidanSummaryGreen LockingGreen beat note PD DC responseI measured the DC response of the Green
PD
  
  4481   Fri Apr 1 18:54:41 2011 BryanConfigurationGreen LockingY end doubling ovenThe doubling oven is now ready to go for
the Y arm. The PPKTP crystal is mounted in
the oven:
 P4010036.JPGP4010041.JPG 
  4482   Fri Apr 1 23:05:58 2011 kiwamuUpdateGreen Lockingnoise budget 
 noise_budget.png 
  4483   Fri Apr 1 23:49:24 2011 kiwamuSummaryGreen Lockingtwo states in green beat-noteAccording
to the measurement done by Aidan and me,
there are two beat-note state.
  
  4485   Mon Apr 4 14:20:32 2011 BryanConfigurationGreen LockingThe wonderful world of mode-matching   Waist_Fits_from_laser.pngWaist_Fits_Bench_Position.png 
  4486   Mon Apr 4 18:58:44 2011 BryanConfigurationGreen LockingA beam of purest greenWe now have green light at the Y end. 
The set-up (with careful instructions
 P4040042.JPG 
  4489   Tue Apr 5 19:54:39 2011 KojiSummaryGreen LockingHamamatsu S3399 testSince last Friday I have been testing the
broadband RF photodetector in order to
figure out the capability of S3399 with the
 S3399_test_110405.pngS3399_test_110405.pdf 
  4490   Tue Apr 5 21:20:11 2011 KojiSummaryGreen LockingX-arm cavity locked with LB1005 servo boxLast Thursday, I tested Newport
Servo Controller LB1005 with the X_arm
green PDH servo.
 servo.pngOLTF.pdf 
  4491   Wed Apr 6 02:41:01 2011 kiwamuUpdateGreen Lockingnoise budget : some more noise It turned out that the dark noise from
the beat PD and the shot noise on the beat
PD was overestimated.
 noise_budget.png 
  4494   Wed Apr 6 19:36:32 2011 AidanSummaryGreen Locking(In)sanity check of Green PD - some inconsistenciesI moved the Hartmut Green PD to the Jenne
laser bench to try to determine if the response
at RF was reasonable or somehow very much
 PD_measurement.pngplot_PD_RF_ratios.pdf 
  4495   Wed Apr 6 22:13:24 2011 BryanConfigurationGreen LockingResonating green light!Every so often things just work out. You
do the calculations, you put the lenses on
the bench, you manually adjust the pointing
  
  4500   Thu Apr 7 16:09:17 2011 AidanSummaryGreen Locking(In)sanity check of Green PD - some inconsistenciesI think I had underestimated the responsivity
of the Silicon PD at 1064nm. The previous
value was based on a rough search online
  
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