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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Categorydown Subject Text Attachments
  2337   Wed Nov 25 20:14:58 2009 AlbertoUpdateABSLAbsL PLL not able to lock: problem fixed

    
        
  
  2338   Wed Nov 25 20:24:49 2009 AlbertoUpdateABSLPLL Open Loop Gain MeasuredI measured the open loop gain of the PLL
in the AbsL experiment.
I repeated the measurement twice:
 2009-09-25_OLgain_g3png.png2009-09-25_OLgain_g6png.png 
  2339   Wed Nov 25 20:28:17 2009 AlbertoUpdateABSLStopped working on the AbsLI closed the shutter of the NPRO for the
night.
  
  2342   Fri Nov 27 02:25:26 2009 ranaUpdateABSLPLL Open Loop Gain Measured


   
        
            
  
  2420   Tue Dec 15 21:39:34 2009 AlbertoUpdateABSLbrief summary of this afternoon's measurementsI took measurements of the open loop
gain of the AbsL PLL with the old Universal
PDH Box.
I Also measured the
  
  2421   Wed Dec 16 11:21:20 2009 AlbertoUpdateABSLUniversal PDH Box Servo FiltersYesterday I measured the shape of the
servo filter of both the old and the new
Universal PDH boxes.
Here they
 NewandOlfFilterTF.pngNewandOlfFilterTF.png 
  2422   Wed Dec 16 11:46:25 2009 AlbertoUpdateABSLAbsl PLL Open Loop GainYesterday I measured the Open Loop Gain
of the PLL in the absolute length experiment.
The servo I used was that of the old Universal
 OldBoxOLTF.png 
  2423   Wed Dec 16 11:55:47 2009 ranaUpdateABSLUniversal PDH Box Servo Filters 
 To me, they both look stable.
I guess that the phase has to go to -180
  
  2460   Mon Dec 28 15:34:14 2009 AlbertoUpdateABSLWorking on the AP tableI opened the auxiliary laser's shutter.
I'm currently working on the AP table.
  
  2461   Mon Dec 28 18:35:27 2009 AlbertoUpdateABSLWorking on the AP table


   
        
            
  
  2493   Sat Jan 9 15:02:01 2010 AlbertoUpdateABSLPRC scanningI scanned the PRC in the frequency range
of 30-60 MHz, untill the PLL lost lock. But
everything is working fine.
The
  
  2502   Mon Jan 11 11:06:53 2010 AlbertoUpdateABSLMeasurement running


   
        
            
  
  2504   Mon Jan 11 16:59:14 2010 AlbertoUpdateABSLInterferometer BusyI'm currently running a measurement on
the PRC.
Please don't interfere with the IFO
  
  2505   Mon Jan 11 19:36:13 2010 AlbertoUpdateABSLMeasurement runningLeaving for dinner. Back in ~1hr.
I left a measurement running. Please
don't interfere with it till I'm back. Thanks.
  
  2506   Mon Jan 11 21:49:17 2010 JenneUpdateABSLMeasurement running

    
        
  
  2508   Tue Jan 12 09:37:05 2010 AlbertoUpdateABSLIFO availableI finished measuring the AbsL for this
morning. The IFO is again available.
Please don't mess up with the
  
  2513   Wed Jan 13 12:03:00 2010 AlbertoUpdateABSLMeasurement now running. Please be carefulAt the moment I'm running a measurement
on the PRC and I'm planning to leave it going
for the time we'll be at the 40m meeting.
  
  2521   Mon Jan 18 18:34:01 2010 AlbertoUpdateABSLMeasurement in progressI started a long measurement of the PRC's
transmissivity. I'm leaving the lab and I'm
going to be back at about 8 tonight. Please
  
  2522   Mon Jan 18 20:58:40 2010 AlbertoUpdateABSLMeasurement in progress

    
        
  
  2531   Tue Jan 19 12:54:39 2010 AlbertoUpdateABSLMeasurement in progressA measurement will be running for the next
hour. Please be careful.
  
  2532   Tue Jan 19 16:21:18 2010 AlbertoUpdateABSLWatchdogs not working and then fixedThis afternoon the watchdogs stopped working:
they didn't trip when the suspension positions
crossed the threshold values.
  
  2534   Wed Jan 20 20:11:56 2010 AlbertoUpdateABSLSome preliminary results from measuring PRC's transmissivity for an amplitude modulated beamHere I'm posting a plot showing a
set of measurements that I made in the past
few days to determine the absolute length
 2010-01-19_PRCtransmissivityVsModel.png 
  2536   Thu Jan 21 10:31:13 2010 KojiUpdateABSLSome preliminary results from measuring PRC's transmissivity for an amplitude modulated beamNice
and interesting plot.
  
  2541   Fri Jan 22 02:54:06 2010 AlbertoUpdateABSLOvernight measurementI'm leaving a measurement running overnight.
It should be done in about one hour.
Tomorrow morning, If you need to
  
  2543   Fri Jan 22 14:40:49 2010 AlbertoUpdateABSLOvernight measurement

    
        
 2010-01-21_PRCtransmissivityVsModel.png 
  2545   Mon Jan 25 16:30:37 2010 AlbertoUpdateABSL166 MHz sideband turned offI turned off the modulation at 166MHZ
becasue I don't need it if I'm only locking
the PRC.
  
  2546   Mon Jan 25 16:46:33 2010 AlbertoUpdateABSL166 MHz sideband turned off

    
        
  
  2547   Tue Jan 26 03:28:56 2010 ranaUpdateABSL166 MHz sideband turned off 
 You can turn the 166 off if
you want. MZ is unhappy after its turned
  
  2550   Wed Jan 27 11:02:30 2010 AlbertoUpdateABSLPRC Cavity Length I fitted the data from scanning
the PRC by changing the beat frequency of
the auxiliary laser beam with the PSL beam.
The
 2010-01-21_PRCtransmissivityVsFit.png2010-01-21_PRCtransmissivity_EntireFreqRange_VsFit.png 
  2553   Fri Jan 29 12:06:58 2010 AlbertoUpdateABSLMeasurement running today at lunch timeI just started a measuremtn that will be
running for the next hour or so. Please be
careful with the interferometer.
  
  2554   Fri Jan 29 13:14:49 2010 AlbertoUpdateABSLMeasurement running today at lunch time

    
        
  
  2576   Mon Feb 8 14:13:03 2010 AlbertoUpdateABSLPLL CharacterizationLately I've been trying to improve the
PLL for the AbsL experiment so that it could
handle larger frequency steps and thus speed
 2010-02-08_Old_PDH_Box_Filter_TF_gain_knob_0_Boost_OFF.png2010-02-08_PLL_OLG_gain_knob_0_Boost_OFF.png2010-02-08_PLL_Noise_Budget.png 
  2577   Mon Feb 8 14:56:17 2010 AlbertoUpdateABSLSuddenly a much better alignment of PRCI just aligned PRM and locked PRC and I
noticed that SPOB is much higehr than it
used to be. It's now about 1800, vs 1200
  
  2578   Mon Feb 8 15:01:46 2010 robUpdateABSLSuddenly a much better alignment of PRC


   
        
            
  
  2579   Mon Feb 8 15:41:51 2010 AlbertoUpdateABSLSuddenly a much better alignment of PRC

    
        
  
  2581   Tue Feb 9 09:07:06 2010 AlbertoUpdateABSLPLL Characterization

    
        
 2010-02-08_PRCtransmissivity_EntireFreqRange_VsFit.png 
  2582   Tue Feb 9 10:10:58 2010 AlbertoUpdateABSLback to analogI want to try to do the measurement with
the network analyzer used as local oscillator,
instead of the Marconis that I'm using now.
  
  2679   Thu Mar 18 10:46:51 2010 KojiUpdateABSLPLL reconstructedLast night (Mar 17) I checked the PLL
setup as Mott have had some difficulty to
get a clean lock of the PLL setting.
  
  2680   Thu Mar 18 12:27:56 2010 AlbertoUpdateABSLPLL reconstructed


   
        
            
  
  2681   Thu Mar 18 13:40:35 2010 KojiUpdateABSLPLL reconstructedWe use the current PLL just now, but the
renewal of the components are not immediate
as it will take some time. Even so we need
  
  2684   Thu Mar 18 21:42:26 2010 KojiUpdateABSLPLL reconstructedI checked the setup further more.

    I replaced the PD from
NewFocus 1GHz one to Thorlabs PDA255.
  
  2696   Mon Mar 22 22:11:26 2010 MottUpdateABSLPLL reconstructed 
 It looks like the PLL drifted
alot over the weekend, and we couldn't get
 IMG_0150.JPG 
  2697   Mon Mar 22 23:37:32 2010 MottUpdateABSLPLL reconstructed 
We have managed to lock the PLL to
reasonable stability. The RF input is attenuated
 2010-03-22_23.14.00.jpg2010-03-22_23.24.50.jpg 
  2703   Tue Mar 23 18:44:46 2010 MottUpdateABSLPLL reconstructed 
 After realigning and getting
the lock today, I tried to add in the SR785
 NPRO_PLL_freqresp.png 
  4832   Fri Jun 17 16:05:07 2011 kiwamuUpdateABSLLightWave out of MOPA box[Suresh / Kiwamu]
 We did the following things
:
 DSC_3139_small.png 
  4840   Mon Jun 20 11:38:49 2011 kiwamuUpdateABSLI-P curve of LightWave M126-1064-700The
I-P curve of the LightWave NPRO (M126-1064-700),
which was taken out from the MOPA box, was
 IP_curve.png 
  4841   Mon Jun 20 13:48:25 2011 KojiUpdateABSLI-P curve of LightWave M126-1064-700Hmm. Was the current within the operating
range? (i.e. Is it a 700mW laser or a 1W
one?)
  
  4842   Mon Jun 20 16:44:02 2011 steveUpdateABSLI-P curve of LightWave M126-1064-700 
 Put the serial numbers into
the elog. So we can identify the laser and
  
  4855   Wed Jun 22 15:24:10 2011 kiwamuUpdateABSLgot a laser controller for LightWavePeter
King came over to the 40m with a laser controller
and gave it to us.
 DSC_3150.JPGDSC_3153.JPG 
  4872   Thu Jun 23 22:59:45 2011 kiwamuUpdateABSLI-P curve of LWE The  IP_curve_small.png 
ELOG V3.1.3-