40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 152 of 341  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  3328   Fri Jul 30 00:02:15 2010 DmassUpdateGreen Lockingwaist positon of Gaussian beam in PPKTP crystals


   
        
            
  
  3330   Fri Jul 30 09:51:58 2010 kiwamuUpdateGreen LockingRe: waist positon of Gaussian beam in PPKTP crystalsOkay, I guess I understand what you want
to know. I did the following steps.
1. calculated the conversion efficiency
 efficiency_waist_edit.pngPPKTPmode.pngPSL_doubling.pngmode_in_PPKTP.png 
  3569   Mon Sep 13 21:52:53 2010 kiwamuUpdateGreen Lockingthe X end laser is ON
 I turned ON the laser
at the X end station, which had
  
  3647   Tue Oct 5 11:42:20 2010 kiwamuSummaryGreen Lockingdeveloping green locking plant With a help from Joe, I made a diagram
of the simulated plant for green locking
in order to get better understanding and
 green_sm3.png 
  3663   Wed Oct 6 22:46:36 2010 kiwamuUpdateGreen LockingSHG at PSL table I
put some optics to get the green SHG on the
  
  3695   Tue Oct 12 01:54:32 2010 kiwamuUpdateGreen Lockingmode matching to doubling crystal on PSL tableI improved
the mode matching of the incident beam to
 PSL_doubling.png 
  3703   Wed Oct 13 00:35:26 2010 kiwamuUpdateGreen LockingPSL beat note setup[ Kevin and Kiwamu ]
 We
  
  3727   Fri Oct 15 06:31:52 2010 kiwamuUpdateGreen LockingPSL beat note setup: part II I
made some KAIZENs (what
  
  3803   Thu Oct 28 03:07:53 2010 kiwamuUpdateGreen Locking80MHz VCO for green PLL : a health check I
did a health check for a 80MHz VCO box. 
 VCO_LPF_fit.png 
  3807   Thu Oct 28 04:28:50 2010 yutaUpdateGreen Lockingchecked frequency counter SR620(Kiwamu, Yuta)

Background:
  
  3809   Thu Oct 28 11:54:31 2010 KojiUpdateGreen Lockingchecked frequency counter SR620ZHL-32A is a high power (well..., actually
middle power) amplifier with the max output
power of +29dBm (~1W!).
  
  3813   Thu Oct 28 20:08:26 2010 yutaUpdateGreen Lockingrevised RF amp cascadingBackground:
  Yesterday, I said I will use
ZHL-32A for amplifying beat note signal,
  
  3820   Fri Oct 29 06:20:20 2010 kiwamuUpdateGreen Locking80MHz VCO for green PLL : VCO calibration I calibrated the VCO frequency
as a function of the applied input voltage.
 calibration.png 
  3823   Fri Oct 29 14:06:12 2010 kiwamuUpdateGreen LockingRe: 80MHz VCO for green PLL : VCO calibrationP.S. There is a document about the 80MHz
VCO box. This may be helpful. 
  
  3850   Wed Nov 3 02:37:39 2010 yutaSummaryGreen Lockingcoarse locked green beat frequency(Kiwamu, Yuta)

 Screenshot_LowFreqLock.png 
  3851   Wed Nov 3 03:00:47 2010 KojiSummaryGreen Lockingcoarse locked green beat frequencyWow! Great guys!!   
  3879   Mon Nov 8 10:48:58 2010 kiwamuUpdateGreen Locking80MHz VCO : PLL open loop looks good   vco_pll.pngVCO_PLL.png 
  3881   Mon Nov 8 16:03:46 2010 kiwamuUpdateGreen Locking80MHz VCO : PLL open loop looks good


   
        
            
  
  3896   Thu Nov 11 13:54:05 2010 kiwamuUpdateGreen Locking80MHz VCO : about PLL hold-in range

The hold-in
 range_green.pngPLL.png 
  3898   Thu Nov 11 17:47:36 2010 kiwamuUpdateGreen Locking80MHz VCO : improve PLL hold-in range and put a boostIn order
to enlarge the hold-in range I modified the
 vco_pll.pngVCO_lfb.png 
  3908   Fri Nov 12 12:06:11 2010 AidanConfigurationGreen LockingPID script working - now it needs to be tuned I've set up a PID script that senses
the EX-PSL Green Beat note (from the frequency
counter) and actuates on the temperature
 Screen_shot_2010-11-12_at_12.05.01_PM.png 
  3920   Mon Nov 15 11:52:22 2010 kiwamuUpdateGreen LockingPLL with real green signal   PLL_with_green.png 
  3927   Mon Nov 15 17:10:59 2010 kiwamuUpdateGreen LockingPLL with real green signal I
checked the slow servo and the PLL of 80MHz
 FCnoise.png 
  3930   Tue Nov 16 09:02:54 2010 AidanUpdateGreen LockingPID loop - calibration of SR620 output [Aidan, Kiwamu]
Kiwamu and I roughly calibrated the
analogue output from the SR620 frequency
  
  3931   Tue Nov 16 10:47:45 2010 AidanUpdateGreen LockingRebooted c1psl - added new GRNBEAT_FREQ channelI restored C1:PSL-126MOPA_126MON to its
original settings (EGUF = -410, EGUL = 410)
and added a new calc channel called C1:LSC-EX_GRNBEAT_FREQ
  
  3932   Tue Nov 16 12:47:30 2010 AidanUpdateGreen LockingPID loop but no greenThe PID loop is ready to be run on the
green beat note but, since the tanks are
open, there is no green transmission from
 Screenshot-C1LSC_EX_GRN_SLOW.adl.png 
  3934   Tue Nov 16 16:00:26 2010 AidanUpdateGreen LockingPID loop but no green

    

       
            
  
  3970   Mon Nov 22 20:31:58 2010 kiwamuUpdateGreen Lockingsearching for unknown loss in green PD path As I said in the past entry (see
this entry), there was unknown loss of
about 20dB in the beat detection path.
 RFPDresponse.png 
  3972   Tue Nov 23 01:45:47 2010 kiwamuUpdateGreen Lockingnoise curve of wideband RFPD

    

       
            
 noise_RFPD.png 
  4007   Fri Dec 3 05:21:11 2010 kiwamuUpdateGreen Lockinglocked the laser to the cavityI succeeded
in locking the end green laser to X arm with
  
  4016   Mon Dec 6 22:18:39 2010 kiwamuUpdateGreen Lockingaligned the beam axis [Suresh and Kiwamu]
We
  
  4093   Thu Dec 23 12:19:43 2010 kiwamuUpdateGreen Lockinginstalled doubling oven base at PSL tableI
gave a christmas present to a doubling oven
who has been sitting on the PSL table.
 DSC_2820_ss.jpgDSC_2814_ss.jpgDSC_2815_ss.jpg 
  4095   Thu Dec 23 18:51:37 2010 ranaUpdateGreen Lockinginstalled doubling oven base at PSL tableThis is not such a bad base design, but
remember that we have to get a couple of parts
  
  4123   Fri Jan 7 00:49:16 2011 JenneUpdateGreen LockingRecovered Xarm Green Lock, Preparation for Beat Note Measurement[Kiwamu, Jenne]
We went this evening in search of
a beat note signal between the Xarm transmitted
  
  4159   Fri Jan 14 20:37:00 2011 kiwamuHowToGreen Lockingplan for this month I summarized how we proceed our green
locking in this month on the wiki.
Since step1 and 2 shown on the wiki
 green_plan.png 
  4174   Thu Jan 20 04:43:28 2011 kiwamuUpdateGreen Lockingstatus update: PLL connected to ADC I
connected the PLL signal to the ADC on c1ioo. 
  
  4176   Thu Jan 20 15:15:39 2011 kiwamuUpdateGreen Lockingstatus update: PLL connected to ADCI
realized that the black AA board I mentioned
  
  4181   Fri Jan 21 02:45:43 2011 kiwamuUpdateGreen Lockinginterface for PLL to ADC  [Suresh, Kiwamu]
  
  
  4187   Sat Jan 22 01:56:04 2011 SureshUpdateGreen LockingExamining the stability of VCO PLL at low frequencies[Kiwamu,
Suresh, Rana]
Our
 VCO_PLL_stability.pngVCO_PLL_stability.png 
  4188   Sat Jan 22 02:03:55 2011 KojiUpdateGreen LockingExamining the stability of VCO PLL at low frequenciesDamn.
If this figure is true, we were looking at
wrong signal. We should look at the feedback
  
  4189   Sat Jan 22 02:11:09 2011 kiwamuUpdateGreen Lockingsome more progress[Rana, Suresh, Kiwanu]

  
  4190   Sat Jan 22 02:23:26 2011 KojiUpdateGreen Lockingsome more progressWhat is the point to use the error instead
of the feedback? It does not make sense to
me.
  
  4191   Mon Jan 24 02:58:46 2011 kiwamuUpdateGreen LockingX arm locked !I succeeded in  time_series.pnggreen_one_arm.png 
  4192   Mon Jan 24 09:33:08 2011 ranaUpdateGreen LockingX arm locked !Very cool.
But the PLL seems very fishy to me.
The ZP-3MH needs 13 dBm to operate correctly.
  
  4193   Mon Jan 24 10:19:21 2011 KojiUpdateGreen LockingX arm locked !Well... The ALS loop is engaged and the
error was suppressed. 
So, how is the IR error signal stabilized
  
  4195   Mon Jan 24 13:08:07 2011 kiwamuUpdateGreen LockingRe: X arm locked !


   
        
            
 e_pll_oltf.png 
  4196   Mon Jan 24 14:27:13 2011 kiwamuUpdateGreen LockingRe: X arm locked !


   
        
            
 masslock_oltf.png 
  4198   Tue Jan 25 05:26:51 2011 kiwamuUpdateGreen Lockingcavity scan   cavity_scan.png 
  4199   Tue Jan 25 06:48:55 2011 kiwamuUpdateGreen LockingTo do listHere are some
tasks that I want someone to work on during
  
  4201   Tue Jan 25 20:42:46 2011 OsamuUpdateGreen LockingSlow servo for green laserI implemented a slow servo for green laser
thermal control on c1scx.mdl. Ch6,7 of ADC
and ch6 of DAC are assigned for this servo
  
ELOG V3.1.3-