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ID Date Authorup Type Category Subject Text Attachments
  2286   Fri Dec 21 15:33:26 2018 KojiDailyProgressWOPODiabolo: trialing SHG oven set temperature points to see if there is a maxima when lockedThis means that you want to make the SHG
crystal longer. Is that true? If so, can
you change the temperature for the optimal
  
  2290   Mon Dec 24 12:07:18 2018 KojiDailyProgressWOPODiabolo: back to power with deliberate pre-misalignmentGreat recovery job!

 
  
  2299   Mon Feb 25 20:42:32 2019 KojiSummaryScatterometerSi Block stored in Cryo LabOn the Friday cleaning, we vacated the
east optical table. The Si scatterometer
was disassembled and the Si block was moved
 P_20190221_115501.jpg 
  2359   Wed Jun 5 14:16:07 2019 KojiUpdate2micronLasers2um laser / cryo stat: setup inspection and action item updates[Aidan, Chris, Koji]

We went down to the lab to check
the situation of the setups for 2um laser
  
  2366   Wed Jun 26 11:45:09 2019 KojiSummary2micronLasers2um PD transimpedanceThe transimpedance amps for the 2um (unamped)
InGaAs detectors were made and evaluated.

Attachment
 PD_model.pdfAMP2_Noise.pdfAMP_Noises.pdfPD_noise.pdfPD_TF.pdf 
  2368   Mon Jul 1 21:20:55 2019 KojiSummary2micronLasersThe PDs delivered to the labThe amplifier sets for the thorlabs 2um
PDs were delivered to the lab.

- PD1 and Amp1, PD2 and Amp2 are
  
  2373   Mon Jul 22 20:36:35 2019 KojiElectronics2micronLasersSockets for LaserComponents PDsWe received the TO-66 sockets for LaserComponents
PDs (Andon Electronics F425-1009-01-295V-R27-L14
Qty.10). It is made of FRP. It is very nicely
 IMG_8793.jpgIMG_8792.jpgIMG_8791.jpg 
  2378   Mon Jul 29 15:46:50 2019 KojiLaser2micronLasersOptical Phase noise of 2 um Mach Zehnder Interferometer.Great! Can you convert this into the laser
frequency noise Hz/rtHz? I believe this [rad/rtHz]
was still the measured phase noise and was
  
  2387   Sun Aug 11 14:35:41 2019 KojiNoise Budget2micronLasersNoise Analysis of voltage regulator using SR785 Spectrum AnalyserQuestions:

1) Has the DC output voltages of
the regulators checked?
  
  2389   Sun Aug 11 22:34:50 2019 KojiNoise Budget2micronLasersNoise Analysis of voltage regulator using SR785 Spectrum Analyser3. You need to flip the direction of the
diode.

1&2 OK, so the circuits were
  
  2393   Mon Aug 12 15:17:05 2019 KojiNoise Budget2micronLasersNoise Analysis of Voltage Regulator using SR785 Spectrum Analyser1. Heat: Check the polarity of the electrolytic
or tantalum caps. 

2. Add 0.1uF high-K ceramic caps
  
  2400   Thu Aug 15 02:30:29 2019 KojiSummary2micronLasersInAsSb PDs accomodated in PD housings / PD cablesInAsSb PDs were housed in the PD cages.
The cages were engraved to indicate the batch
(Sb3512 or 3513) and the serials (A1, A2,
 9x 
  2404   Fri Aug 16 01:28:28 2019 KojiSummary2micronLasersSwitchable breakout bokDB9 switchable breakout box is ready. We
are ready to do some PD test now.
 P_20190815_210355.jpgP_20190815_210419.jpg 
  2409   Fri Aug 23 17:35:37 2019 KojiNoise Budget2micronLasersNoise Analysis of Circuit using SR785 Spectrum Analyser and Zero SimulationThe TF looks good. But the noise measurement
is obviously limited by the SR785 noise.
We need a preamp, which is only for the purpose
  
  2412   Thu Aug 29 15:36:49 2019 KojiNoise Budget2micronLasersNoise Bump observed at 8kHz during TIA noise analysisYou need to check the voltage noise of
the regulator outputs with the opamps connected.
Probably you did it. If so, it is a riddle
  
  2420   Tue Sep 10 18:38:18 2019 KojiNoise BudgetPD noiseDark Noise measurement of Extended InGaAs - Previously, your TIA was pretty much
dominated by the thermal noise current of
the 5K transimpedance resistor (=0.129/sqrt(5000)
  
  2423   Mon Sep 23 10:49:27 2019 KojiSummaryPD QEQE and dark current of InAsSb sensorsThe QE and dark current of all
the InAsSb sensors were measured.
All the measurements were done in room temperature.
 InAsSb_QE.pdfInAsSb_DarkCurrent.pdf190921_SbPD_QE.zip 
  2424   Mon Sep 23 23:48:12 2019 KojiUpdate2micronLasers2um sensor cards / focusing opticsFiber Collimator (Thorlabs F028APC-2000+AD11F+LMR1)
and MIR sensor cards (Thorlabs VRC6S Qty2)
were delivered.
 IMG_8936.jpg 
  2425   Wed Sep 25 01:05:30 2019 KojiSummaryPD QEQE and dark current of InAsSb sensorsThe lenses were arranged so that the spot
on the PD can become smaller. A quick measurement
on a (500um)^2 element showed the QE of ~80%
 P_20190924_233507_vHDR_On.jpgP_20190925_003614_vHDR_On.jpgInAsSb_QE.pdfInAsSb_DarkCurrent.pdf 
  2436   Tue Oct 22 15:55:52 2019 KojiElectronicsGeneralBorrowed ITC510 from CryoFrom Cryo Cav setup

Borrowed ITC510 Laser Driver/TEC
controller combo -> QIL
  
  2438   Thu Oct 31 18:31:10 2019 KojiLaserPD QEPD EQE vs Spot sizeInAsSb PD QE Test

The relationship between the spot
radius and the apparent QE (EQE) was measured.
 QE_vs_spotsize.pdf 
  2439   Fri Nov 1 12:47:18 2019 KojiLaserPD QEPD EQE vs Spot sizeClipping and saturation were investigated
by the semi-analytical model. In the analysis,
the waist radius of 20um at the micrometer
 QE_vs_spotsize_no_saturation.pdfQE_vs_spotsize_saturation_0_85.pdfQE_vs_spotsize_saturation_0_1.pdf 
  2443   Tue Nov 12 03:40:39 2019 KojiLaserPD QEPD EQE vs Spot sizeThe QE of the (500um)^2 element has been
tested with a half-power (0.51mW) instead
of 0.92mW.
 QE_vs_spotsize_half_power.pdf 
  2446   Fri Nov 15 20:10:00 2019 KojiSummary2micronLasersInAsSb PD Mounts designed

  
  2450   Wed Nov 20 11:59:17 2019 KojiLab InfrastructureGeneralMoved IR Labs cryostat into QIL from Cryo LabAh, I have designed the PD holder with
the venting targeted for 1/4-20 holes with
1" grid...
  
  2451   Wed Nov 20 12:25:58 2019 KojiLab InfrastructureGeneralMoved IR Labs cryostat into QIL from Cryo LabThe large cryostat has 1/4-20 holes on
a 2 inch grid

The IR labs cryostat has 4-40 holes
  
  2452   Wed Nov 20 17:44:10 2019 KojiLab InfrastructureGeneralMoved IR Labs cryostat into QIL from Cryo LabHere you are.  P_20191120_174034_vHDR_On.jpgP_20191120_174040_vHDR_On.jpg 
  2457   Fri Nov 22 15:33:40 2019 KojiLab InfrastructureGeneralMoved IR Labs cryostat into QIL from Cryo LabSalvaged an assort of vented/non-vented
screws, washers, spring washers, and clamps
for #4-40 & 1/4-20 from the 40m cleanroom
 P_20191122_150845_vHDR_On.jpg 
  2458   Sat Nov 23 13:00:06 2019 KojiLab InfrastructureOpticsOptical window transmission measurementThe power transmission of the optical window
for the IRLab cryostat was measured to be
0.966+/-0.002
 optical_window_T.pdfP_20191122_183426_vHDR_On.jpgP_20191122_183436_vHDR_On.jpg 
  2459   Mon Nov 25 15:03:34 2019 KojiUpdatePD QEIn solder and PD mounts are in The PD mounts were delivered from ProtoLabs.
The order was sent on Tue last week and it's
here on Monday. Excellent!
 PB259778.JPGPB259780.JPGPB259781.JPG 
  2460   Mon Nov 25 21:46:56 2019 KojiSummaryPD QESystem DiagramSystem diagram of the PD QE test with the
IRLabs cryostat.

 
 cryo_pd_test.pdfInAsSb_PD_mount_short.PDFPD_pin.pdf 
  2462   Tue Nov 26 18:49:11 2019 KojiUpdatePD QESocket soldering test piece madeNormal solder (Sn63 Pb37): with flux, wetting
o

Pure Indium - In 99.995: no flux,
 6x 
  2463   Wed Nov 27 20:38:57 2019 KojiSummaryPD QESystem DiagramThe external Dsub cable is ready except
for the 32pin connector to be plugged-in
to the chamber. See QIL
 P_20191127_203612_vHDR_On.jpg 
  2464   Sun Dec 1 01:32:19 2019 KojiSummaryPD QEPD TEC cooling testWhile I'm still waiting for the proper
connector for the vacuum feedthru of the
IRLabs cryostat, I have connected to the
 20191129191814_IMG_9146.JPGcooling_dark_current.pdf 
  2465   Tue Dec 3 13:52:04 2019 KojiUpdatePD QESocket soldering test piece made[Raymond and Koji]

We dunked the PD socket test piece
into LN2 and repeated heat cycle 8 times.
 PC029784.jpegPC029788.jpegPC029786.jpegPC029787.jpeg 
  2466   Tue Dec 3 15:32:39 2019 KojiSummaryPD QEPD TEC cooling testThe quantities we want to measure as a
function of the temperature:

- Temperature: 2.2k thermister
  
  2468   Thu Dec 5 13:50:59 2019 KojiSummaryPD QEDark current measurement with the sourcemeterI borrowed KEITHLEY 2450 source meter from
Rich. The unit comes with special coaxial
cables and banana clips. Most of the peripherals
 InAsSb_DarkCurrent_markedup.pdf 
  2471   Mon Dec 9 12:34:14 2019 KojiDailyProgressPD QE I can
see some screws are not vented.
You also need to use a vented screw for the
  
  2473   Mon Dec 9 14:45:45 2019 KojiDailyProgressPD QEToward PD testing automationWow. This is great, thanks Chris.

 
  
  2475   Wed Dec 11 01:29:26 2019 KojiSummaryPD QESb3513 A2P6 Dark Current / QE / Dark Noise measurement @77K[Raymond, Aidan, Chris, Koji]

P6 element (500um)^2

- We looked at the current amp
 Sb3513_A2P6_DarkCurrent_77K.pdfSb3513_A2P6_QE_77K.pdfSb3513_A2P6_DarkNoise_77K.pdf191210_3513A2P6.zip 
  2482   Fri Dec 20 21:58:14 2019 KojiUpdatePD QEPD TEC driver / A2P6 aligned / Lens moved==
Currently, A2P6 is aligned ==


1) I've brought another TEC driver
 P_20191220_192440_vHDR_On.jpgP_20191220_180929_vHDR_On.jpg 
  2483   Fri Dec 20 22:26:19 2019 KojiUpdatePD QEPD TEC driver / A2P6 aligned / Lens movedThe QEs were measured at 293K, 239K, 232K,
and 293K again. The cooling was provided
by the PD TEC.  At each temperature,
 6x 
  2488   Thu Feb 27 14:26:52 2020 KojiSummaryLab MonitoringItem lending: Particle Counter from OMC Lab to QILItem lending as per Ian's request:
Particle Counter from OMC Lab to QIL

The current particle class of
 P_20200227_134755_vHDR_On.jpg 
  2490   Mon Mar 9 13:13:02 2020 KojiLab InfrastructureHVACHVAC work concluded for todayLast Friday, I found the HEPA units on
the squeezer table were not on. I turned
them on at "SLOW".
  
  2491   Mon Apr 6 18:35:48 2020 KojiSummaryGeneralWest Bridge flooding Apr 6thWest Bridge flooding Apr 6th due to rain
in the night

Looks like the first responder
 image2.jpegimage1.jpeg 
  2492   Mon Apr 6 18:38:50 2020 KojiUpdateGeneralWest Bridge flooding Apr 6thTo check the status of all the labs, I
went to WB. There was no ongoing water leakage
in the labs.
 15x 
  2493   Mon Apr 6 19:01:21 2020 KojiUpdateGeneralWest Bridge flooding Apr 6thAdditional notes:

I did not see anyone in the building.

Attachment 1/2: Our labs have no
 20200406151420_IMG_9653.jpg20200406151428_IMG_9654.jpg20200406151459_IMG_9655.jpg20200406151633_IMG_9656.jpg20200406151709_IMG_9658.jpg 
  2521   Fri Nov 20 18:47:42 2020 KojiSummaryGeneralPermenant exchange of TED200C(QIL) and TED200C(2umECDL)I moved the brand new TED200C on the workbench
to Crackle for 2um ECDL (permanently)
The TED200C temp controller used in
  
  2522   Fri Nov 20 18:49:43 2020 KojiSummaryGeneralInstrument loanFEMTO DLPCA200 low noise preamp (brand
new)

Keithley Source Meter 2450 (brand
  
  2526   Tue Dec 22 15:20:14 2020 KojiSummaryGeneralInstrument loanIs the reverse bias programmable? FEMTO
has a bias trimmer on it. It's useful
in the usual application, but for automation,
  
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