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ID Date Author Type Categoryup Subject Text Attachments
  3000   Thu May 27 10:30:32 2010 kiwamuHowToGreen LockingPSL setup for green locking I
leave notes about a plan for the green locking
  
  3004   Fri May 28 07:13:05 2010 AlbertoFrogsGreen LockingSR785 found abandoned next to the workbenchesA poor lonely SR785 was found this morning
roaming around in the lab in evident violation
of  the fundamental rule which requires all
  
  3059   Wed Jun 9 11:13:11 2010 kiwamuUpdateGreen Lockinglock with PDH boxA
progress on the end PDH locking :
  
  3065   Fri Jun 11 11:54:42 2010 kiwamuUpdateGreen Lockingend PDH with thermal feedbackA thermal
feedback was installed to the end PDH locking
 LPF.pngthermal_feedback.png 
  3066   Fri Jun 11 13:32:28 2010 KojiUpdateGreen Lockingend PDH with thermal feedbackGJ! 

  
  3092   Sun Jun 20 18:28:25 2010 kiwamuUpdateGreen LockingRe: lock with PDH boxOn the wiki I summarized about the modification
of the PDH box which is currently running
on the end PDH locking. 
  
  3112   Thu Jun 24 01:02:34 2010 Sharmilla, Rana and KiwamuUpdateGreen Lockinga channel for PPKTP temperatureWe added
a channel on c1psl in order to monitor the
  
  3113   Thu Jun 24 06:49:29 2010 AidanUpdateGreen Lockinga channel for PPKTP temperatureIs this a setpoint temperature that we
can change by writing to the channel or is
it a readout of the actual temperature of
  
  3122   Fri Jun 25 20:32:30 2010 kiwamuUpdateGreen Lockinggreen power on the PSL tableThe power
of the green beam generated on the PSL table
 optical_power.png 
  3188   Fri Jul 9 12:25:25 2010 kiwamuUpdateGreen LockingSHG on PSL tableIn order
to increase the green power on the PSL table,
 PSL_doubling.png 
  3195   Mon Jul 12 13:16:53 2010 kiwamuUpdateGreen LockingPZT feedback at X endThe
feedback signal going to the laser PZT at
the X end station was measured in 
 arm_day_night.png 
  3203   Tue Jul 13 11:00:29 2010 kiwamuUpdateGreen LockingSHG on PSL table : optimum temepratureThe optimum
temperature for the doubling crystal on the
 power_temp.png 
  3204   Tue Jul 13 11:20:07 2010 DmassUpdateGreen LockingSHG on PSL table : optimum temeprature 
 It seems like you might inherit
an offset by using step (3) b/c of the temperature
  
  3262   Wed Jul 21 19:11:18 2010 DmassUpdateGreen LockinglockedWhat did you use to filter the 2f components
from your error signal? A homemade low pass
or what?
  
  3314   Wed Jul 28 18:24:57 2010 JenneUpdateGreen Locking2 Green Periscopes have mirrors, aligned[Koji, Jenne, Kiwamu]
This is to describe the work that
went on in the Cleanroom today.  Kiwamu's
  
  3325   Thu Jul 29 21:13:39 2010 DmassUpdateGreen Lockingwaist positon of Gaussian beam in PPKTP crystals


   
        
            
  
  3327   Thu Jul 29 22:58:25 2010 kiwamuUpdateGreen Lockingwaist positon of Gaussian beam in PPKTP crystals- As you said, I just calculated the waist
position in the crystal because the speed
of light changes in a medium and eventually
  
  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
  
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