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ID Date Author Typeup Category Subject Text Attachments
  72   Mon Feb 22 16:21:43 2010 Frank, TaraLaserRC noiseboth cavities locked, optimizing beat signaltuned the temperatures over night to be
able to lock both cavities today. Cavities
are now locked and Tara is optimizing the
  73   Mon Feb 22 18:58:23 2010 Tara ChalermsongsakLaserRefCavbeat frequency between transmitted beams Today  we finally see the beat
between transmited beams from Ref Cavity
and A Cavity.  Now we are trying to
  74   Tue Feb 23 20:13:00 2010 Tara ChalermsongsakLaserRefCavsuccessfully use ifr2023 to track the frequncy drift of the beat  The drift in the demodulated signal
(beat frequency x local oscillator) can be
tracked by using ifr2023 and sr560. We successfully
  75   Wed Feb 24 11:58:20 2010 ranaLaserRefCavsuccessfully use ifr2023 to track the frequncy drift of the beatVolts? What are Volts???
This plot should be converted into
radians/rHz or Hz/rHz in order to be used.
  76   Wed Feb 24 19:40:25 2010 Tara ChalermsongsakLaserRC noisecalibrating ifr2023The calibration for ifr203 input for external
frequency modulation is 
  77   Wed Feb 24 20:07:00 2010 Tara ChalermsongsakLaserRC noiseRC frequency noise I changed the gain setting on SR560
to find how it will effect the noise floor
of the RC noise.
  78   Thu Feb 25 19:03:59 2010 Tara ChalermsongsakLaserRC noiseNoise floor from PD and SR560Noise floor from PD and SR560 are measured,
then converted from V/rHz to frequncy/rHz
by the calibration from IFR2023 (0.7 MHz/Volt).
  80   Fri Feb 26 15:15:56 2010 Tara ChalermsongsakLaserRC noisequarter wave plate added/power from Ref and A Cavs measuredI borrowed one of the quarter wave plate
and added it after the beam from the Ref
Cav. One more QWP is needed for the ACav.
  81   Sun Feb 28 23:53:21 2010 ranaLaserRC noiseNoise Budget   rcnb.png 
  82   Mon Mar 1 17:52:46 2010 Tara ChalermsongsakLaserRC noiseNew ResultI got a quarter wave plate from Greg Ogin
this afternoon. The attached plots show:
black-> RC noise when there are
  83   Mon Mar 1 22:39:39 2010 ranaLaserRC noiseNoise Budget40m entry on RIN induced thermo-optic noise
  84   Wed Mar 3 08:46:26 2010 ranaLaserRC noiseNoise as measured by the 40m MCThis
link points to a measurement of the frequency
noise at the 40m.
  85   Wed Mar 3 15:59:10 2010 Tara ChalermsongsakLaserRC noiseNoise from function generator I took the data of frequency noise
of the functiongenerator("Marconi")
and spectrum analyzer's noise from Mott's
  86   Thu Mar 4 19:44:08 2010 Tara ChalermsongsakLaserRC noiseNoise from VCOVCO frequency noise is measured. V input
is 4.7 Volt. The signal output from the VCO
(which controls the AOM) is mixed with signal
  87   Fri Mar 5 00:34:09 2010 FrankLaserRC noiseNoise from VCO

  88   Fri Mar 5 14:40:21 2010 FrankLaserRC noiseNoise from VCO

  89   Thu Mar 11 22:45:58 2010 Tara ChalermsongsakLaserRC noiseVCO f noiseI measured the VCO noise again.  2
methods that I tried
1) Measuring noise from a) suppressed
  97   Tue Apr 6 18:39:04 2010 Tara ChalermsongsakLaserRefCavCalculation for higher order mode's frequency I calculated the frequency for other
higher Hermite-Gaussian modes, (n+m up to
20) to make sure that there is no overlap
  98   Wed Apr 7 12:30:47 2010 ranaLaserRefCavCalculation for higher order mode's frequencyI deleted your plot, since it contained
no axes labels. We have a strict rule
against plots like those. You must have physical
  99   Wed Apr 7 18:29:16 2010 Tara ChalermsongsakLaserRefCavCalculation for higher order mode's frequencyThere's a correction
1) the beam waist inside the cavity,
it seems that the 237 um(which corresponds
  102   Mon Apr 12 10:57:33 2010 Tara ChalermsongsakLaserLaserCorrection for higher order mode frequencyLast time, the calculated beam waist I
got was based on two identical mirrors with
no reflecting coating layers on the back
  103   Mon Apr 12 11:04:15 2010 Tara ChalermsongsakLaserLaserPSL layout for new setupThe layout for the new PSL setup
( lenses, and their positions are to be calculated.)
  106   Tue Apr 13 15:06:35 2010 Tara ChalermsongsakLaserRefCavHOM, from carrier and both sidebandsHOM frequency shift for RefCav is plotted
below. The second one has clearer dots.
Y axis is the frequency shift in
  114   Tue May 4 03:40:00 2010 ranaLaserRC noiseupdated noise budget code is in SVN  rc_sio2_300.pdf 
  119   Tue May 11 22:26:34 2010 Tara ChalermsongsakLaserLaserBeam waist measurement 
I measured the beam waist of Lightwave
NPRO 1064nm 100mW with WinCamD.
  120   Wed May 12 22:10:13 2010 Tara ChalermsongsakLaserLaserBeam waist measurementI measured the beam waist again. The laser
was operated at full power ~100mW. A mirror
attenuated the beam to 60 uW and ND 
  121   Thu May 13 13:41:32 2010 Tara ChalermsongsakLaserLasermode matching from laser to PMC

  122   Thu May 13 20:56:57 2010 FrankLaserLaser100mW NPRO problemswe still have serious problems with the
100mW laser head. I traced it down to the
connection between the PCB and the hermetically
  123   Mon May 17 21:32:35 2010 Tara ChalermsongsakLaserLaserPMC alignmentI'm trying to align the PMC.  The
transducer is connected to the PMC servo
card's HV out.
  124   Tue May 18 15:21:12 2010 Tara ChalermsongsakLaserLaserPMC alignment

  125   Wed May 19 00:18:45 2010 Tara ChalermsongsakLaserLaserPMC alignmentAfter checking the PMC servo card,
ramp signal goes to ext DC 
HV in is applied properly,
  126   Thu May 20 21:50:35 2010 taracLaserLaserPMC is almost ready to be locked We still need two SMA cables. One
connects between 21.5Mhz EOM and PMC servo
card, another one connects between PMC PD
  127   Mon May 24 09:56:19 2010 ranaLaserPMCPMC is almost ready to be lockedYou should make sure not to blow up
the PMC PD: i.e. the total power on the
PD out of lock should be less than 100
  128   Mon May 24 19:30:15 2010 ranaLaserPMCPMC is almost ready to be locked

  129   Mon May 24 19:40:12 2010 taracLaserLaserRef Cav prealignment 
Dear elog
  I don't know why I can't lock
  130   Tue May 25 17:01:57 2010 taracLaserLaserPMC cavity is locked      After adding
another 1/2 plate to have P wave into
the cavity, I can lock the PMC cavity. It's
  131   Wed May 26 21:11:00 2010 taracLaserLaserprogress on PSL setup  
I add the broad band EOM in the beam
path. After adjusting the periscope, I can
  132   Thu May 27 11:18:51 2010 taracLaserLaserSchematic for FSS servo and Lightwave 126 1064 100mWThis is the schematic of PSL fss servo.
I have to make sure that the modulation
voltage will not exceed the controller's
  133   Thu May 27 18:20:42 2010 taracLaserLaserAligning RefCavI switched the cable from the 10W controller
to the original controller for 100 mW laser.
It is working well now, the cables are tied
  134   Fri May 28 20:46:14 2010 taracLaserLaserProgress on PSL: Aligning RefCav Since the frequency of the laser
going into RefCav is determined by PMC ,I
decided to temporarily remove the PMC for
  135   Sat May 29 12:01:17 2010 FrankLaserLaserProgress on PSL: Aligning RefCav

  136   Sun May 30 22:49:28 2010 taracLaserLaserRefCav is lockedI see TEM00 transmitted beam out of RefCav.
I think I have to fine tune the FSS gain
a bit more becasue the spot still oscillates
  137   Tue Jun 1 07:39:47 2010 FrankLaserLaserRefCav is locked

  138   Tue Jun 1 14:16:00 2010 taracLaserLaserPSL setup: next stepThis is the schematic for PSL setup.
At this point, Pre Mode Cleaner (PMC)
  139   Tue Jun 1 19:26:41 2010 taracLaserLaserA mirror gets into the insulation's borderI'm aligning the AOM. The R=0.5m mirror's
position crosses the insulation border by
1.5" (see attached picture.) The black
  140   Thu Jun 3 00:52:37 2010 taracLaserLaserAligning AOM I'm aligning the AOM and maximizing
the diffracted beam's power by positioning
the AOM and adjusting the beam size by moving
  141   Thu Jun 3 08:42:44 2010 FrankLaserLaserAligning AOM

  142   Thu Jun 3 14:47:58 2010 FrankLaserLaserAligning AOM

  143   Thu Jun 3 15:45:39 2010 FrankLaserLaserAligning AOM

  144   Thu Jun 3 22:00:21 2010 FrankLaserLaserAligning AOM

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