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ID Date Author Type Categoryup Subject Text Attachments
  2216   Sat Jul 21 14:17:20 2018 awadeDailyProgress2micronLasersThe case of the DET10D Photodiode, featuring TIACool.  You should also make a plot
of the actual noise you measured of the circuit
with the SR785 (even though this was only
 notebook_pyliso_WOPO1mmTransImp-v3.ipynb.zip 
  2221   Thu Jul 26 17:49:28 2018 Vinny W.DailyProgress2micronLasersPower Loss through different optic componentsIn our mission to characterize our 2micron
laser, I calculated the changes of power
at different points within the experiment-
 poweranalysis.JPG 
  2226   Thu Aug 2 18:06:54 2018 awadeDailyProgress2micronLasersThe case of the DET10D Photodiode, featuring TIAYou are missing a factor of R_F under the
square root.

Equation should read:
  
  2228   Mon Aug 6 03:45:37 2018 Vinny W.DailyProgress2micronLasersThermal Sensor Circuit UpdateBelow are the schematics of the two added
sections to the passive temperature sensor
circuit we're building. Since we're
 scheme_voltageref.JPGscheme_thermalsensor.JPG20180806_162441.jpg20180806_135423.jpg 
  2230   Tue Aug 7 10:47:43 2018 awadeDailyProgress2micronLasersThermal Sensor Circuit UpdateGreat.
A few things:

 LISOModel_Sallen-Key.ipynb.zip 
  Draft   Tue Aug 14 13:44:47 2018 Vinny W.DailyProgress2micronLasersNoise AnalysesWith the two 15m optic fibers in, we can
start building the thermally-actuated reference
interferometer portion of the 2um experiment.
  
  2250   Thu Sep 6 10:19:54 2018 awadeDailyProgress2micronLasersThermal Sensor Circuit: ModificationsI had another look at Vinny's AD590
temperature sensor preamplifier.  After
debugging and thinking for a bit I made a
 8x 
  2307   Wed Mar 20 15:57:55 2019 AnjaliNoise Budget2micronLasersNoise budget for the frequency discriminatorI was trying to prepare the noise budget
for the frequency stabilisation setup for
2 micron laser. In this test, we use a fiber
 High_pass_transfer_function.pdfShot_noise.pdfThermoconductive_noise_of_fiber_Glenn_parameter.pdfnoise_budget_combined_log_log.png 
  2308   Wed Mar 20 19:17:50 2019 ranaNoise Budget2micronLasersNoise budget for the frequency discriminatorI think the dark noise should be very close
to the shot noise and also have the same
transfer function.
  
  2309   Thu Mar 21 00:49:35 2019 AnjaliNoise Budget2micronLasersNoise budget for the frequency discriminatorI didn't use the transfer funtion in
the calculation of dark current noise thinking
dark current noise is a characteristic of
  
  2310   Thu Mar 21 09:43:19 2019 AnjaliNoise Budget2micronLasersNoise budget for the frequency discriminatorAlso, I have a doubt that whether the transfer
function should be of low pass in nature.
So, if the laser phase is fluctuating faster
 Noise_budget_with_low_pass_transfer_function.pdf 
  2311   Fri Mar 22 10:00:30 2019 AnjaliNoise Budget2micronLasersNoise budget for the frequency discriminatorAttachement #1 shows the modified noise
budget with modification on dark current
noise.
 Noise_budget_modified.pdf 
  2312   Mon Mar 25 09:40:16 2019 AnjaliNoise Budget2micronLasersNoise budget for the frequency discriminator
Different fiber parameters are
very important in determining the thermal
noise of the fiber. I was considering SM1950
 Comparison_of_thermoconductive_noise_in_Hz_per_rtHz.pdfNoise_budget_with_thermomechanical_noise.pdf 
  2313   Tue Mar 26 17:13:53 2019 AnjaliUpdate2micronLasersFrequency stabilization of 2 micron sourceExperimental plan 


The aim is to repeat the
homodyne measurement setup with  balanced
 Homodyne_setup_for_2_micron.pdf 
  2323   Wed Apr 10 12:17:34 2019 AnjaliUpdate2micronLasersIntensity noise stabilization of 2 micron source[Aidan, Anjali]


Attachment #1 shows the
cleaned up setup for  2 micron experiment
We
 2_micron_setup.jpgLaser_chara_setup.pngLaser_characteristics.pdfAOM_chara_setup.pngAOM_characteristics.pdf 
  2325   Wed Apr 10 18:58:48 2019 ranaUpdate2micronLasersIntensity noise stabilization of 2 micron sourceOK...but how will the amplitude stabilization
be done? How about a diagram showing the
feedback loop and electronics?
  
  2328   Wed Apr 24 09:01:49 2019 AnjaliUpdate2micronLasersIntensity noise stabilization of 2 micron sourceAttachment #1 shows the schematic of the
experimental setup for amplitude stabilization
using AOM. The proposed idea is as follows
 Intensity_stabilisation.png 
  2333   Sun May 5 15:17:33 2019 AnjaliNoise Budget2micronLasersFrequency noise measurement of 2 micron sourceWe are going to start the heterodyne configuration
for the frequency noise measurement of 2
micron laser source. The schematic of the
 schmeatic_heterodyne.pngNoise_budget_modified.pdf 
  2334   Sun May 5 20:52:16 2019 ranaNoise Budget2micronLasersFrequency noise measurement of 2 micron sourceLooks good! A few comments:


The LPF should be a 1.9
MHz LP from Mini-circuits
The
  
  2338   Fri May 10 16:22:45 2019 AnjaliUpdate2micronLasersCharacterization of RF driver and AOM . Following are the results from RF driver
and AOM characterisation.



Attachment #1 shows
 6x 
  2343   Wed May 15 20:08:01 2019 AnjaliUpdate2micronLasersPLL loop for frequency noise measurement
We are trying to setup the phase
locked loop (PLL) for the frequency noise
measurement of 2 micron laser. We started
 7x 
  2344   Thu May 16 13:40:13 2019 anchalUpdate2micronLasersPLL loop for frequency noise measurementI think you have made some coding error
in your attachment 7 plot. Just pick a point
in your plot and calculate by hand if your
  
  2346   Sat May 18 22:25:30 2019 AnjaliUpdate2micronLasersCharacterization of new detectorThe new photo detector has arrived (https://www.newport.com/p/818-BB-51F)
. We did the DC and AC characterization of
 setup.pngbeat_note.pdfNoise_floor.pdf 
  2347   Sun May 19 22:08:09 2019 AnjaliUpdate2micronLasersPLL loop for frequency noise measurement

After the discussion with
Prof.Rana, we realised the mistake in our
analysis. It was also suggested to make the
 setup_close_loop_transfer_function.pngActuation_slope_10kHzV_diff_gain.pdfgain_10_different_actuation_slope.pdfFM_noise_AFG_Actuation_30kHzV_diff_gain.pdfFM_noise_AFG_gain_10_different_actuation_slope.pdf 
  2348   Mon May 20 02:23:14 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron source using PLL

Attachment # 1 shows the
schematic of the experimental setup for the
frequency noise measurement of 2-micron laser
 FM_noise_measurement_setup.png2_micron_FM_noise.pdfOscilloscope.mp4SR_785.mp4 
  2350   Thu May 23 02:53:19 2019 AnjaliUpdate2micronLasersCharacterization of new detectorFC/UPC to FC/APC patch cord has arrived.
I repeated the DC characterisation of the
photodetector with this patchcord. The couping
  
  2351   Thu May 23 03:00:24 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron source using PLL
The delay line length is measured
to be 15.7 m. 
As suggested
by Prof.Rana, I used a DC block after the
 Detector_output.pdfFM_noise_full_span.pdfFM_noise_short_span.pdfoscilloscope.mp4 
  2353   Sun May 26 01:12:33 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron source using PLL

I added one more amplifier
stage (ZFL-500 LN) after the detector. Since
noise figure of ZFL-500LN (2.9 dB) is lower
 8x 
  2355   Wed May 29 08:16:47 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron source using PLLAttachment #1 shows the oscilloscope traces
at different gain values when the actuation
slope is 100 kHz/V. It also shows the base
 oscilloscope_trace_s_100kHz.zip 
  2357   Thu May 30 07:43:21 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron source using PLL
The new 2 micron detector has a
50 ohm termination resistance, which is the
transimpedance resistor, and hence the gain
 Oscilloscope.mp4Spectrum_analyser.mp4 
  2358   Sat Jun 1 09:46:00 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron source[Anchal, Anjali]

We tried the Lock in amplifier
in Moku lab for the frequency noise measurement.
  
  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
  
  2360   Fri Jun 7 16:32:59 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron sourceAttachment # 1 show the schematic of the
lock in amplifier configuration used in Moku
lab. We saved the in phase and quadrature
 Lock_in_amplifier_moku_lab.jpgFM_noise.pdf 
  2362   Thu Jun 13 22:53:25 2019 AnjaliUpdate2micronLasersFrequency noise measurement of 2 micron sourceThere was a correction in the script I
used to estimate the frequency noise from
the inphase and quadrature component. Attachment
 FM_noise_new_.pdfMokulab.m 
  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
  
  2372   Mon Jul 22 20:21:33 2019 ShalikaNoise Budget2micronLasersNoise Analysis of Circuit using SR785 Spectrum Analyzer and Zero SimulationThe transimpedance
amps, differential circuit and the whitening
 7x 
  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 
  2374   Tue Jul 23 21:02:14 2019 Shalika SinghDailyProgress2micronLasersTransfer Function using SR785 spectrum analyzerThe transfer function of the circuit was
analyzed.

Attachment
 full_circuit.pdfTransfer_Function_of_Circuit.pdf 
  2375   Wed Jul 24 18:50:27 2019 Shalika SinghDailyProgress2micronLasersCorrection in Transfer Function using SR785 spectrum analyzerThere were some errors in the previously
obtained transfer function of the part where
TIA was in series with the Whitening
 full_circuit.pdfTransfer_Fucntion.pdf 
  2376   Thu Jul 25 11:15:40 2019 Nathan HollandDailyProgress2micronLasersPhase Noise of Moku.Attached are the results from measuring
the phase noise of the Moku with a SRS DS345,
which was the available signal generator
 8x 
  2377   Mon Jul 29 14:46:09 2019 Nathan HollandDailyProgress2micronLasersOptical Phase noise of 2 um Mach Zehnder Interferometer.Figure 1, attached, shows the phase noise
I measure from the 2 um Mach Zehnder interferometer.
This phase noise is from the optical path
 Optical_Phase_Noise_Spectra_2um_Mach_Zehnder__20190729.pdf20190729__Initial_Phase_Noise_Measurement_setup.pdfMeasured_phase_spectra_2um_Mach_Zehnder__20190729.pdf2um_Mach_Zehnder_data__20190729.hdf5 
  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
  
  2379   Mon Jul 29 17:52:33 2019 Shalika SinghDailyProgress2micronLasersNoise Analysis of Circuit using SR785 Spectrum Analyser and Zero SimulationAttachment 1: The Circuit Diagram,

>>  the TIA with a gain
of 5.1k
 full_circuit.pdfNoise_across_TIA.pdfNoise_across_Differential_Circuit.pdf 
  2380   Tue Jul 30 20:42:06 2019 ranaDailyProgress2micronLasersNoise Analysis of Circuit using SR785 Spectrum Analyser and Zero SimulationOh
no! We've lost all of the low frequency
  
  2381   Thu Aug 1 11:25:27 2019 Shalika SinghDailyProgress2micronLasersNoise Analysis of Circuit using SR785 Spectrum Analyser and Zero SimulationInput Referred noise to be calculated for
trans-impedance.

Attachment 1: The Setup,
 Circuit.pdffull_circuit.pdfSR785_display_screen.pdfNoise_across_TIA.pdf 
  2382   Thu Aug 1 13:01:15 2019 ranaDailyProgress2micronLasersNoise Analysis of Circuit using SR785 Spectrum Analyser and Zero Simulationalways keep the start frequency at 0 Hz
no matter what the span, as I was showing
you yesterday in the lab. Otherwise, the
  
  2383   Fri Aug 2 16:15:01 2019 Nathan HollandDailyProgress2micronLasersFrequency Noise Measured by 2um Mach Zehnder.Here I follow, essentially, the same setup
as in attachment 2 of elog
2377. The difference is that I
 Measured_Mach_Zehnder_frequency_noise_SmoothMedian__20190805.pdfMeasured_phase_spectra_2um_Mach_Zehnder_BB_SmoothMedian__20190805.pdf2um_MachZehnder_frequency_noise__20190805.hdf5 
  2384   Thu Aug 8 17:19:12 2019 Shalika SinghNoise Budget2micronLasersNoise Analysis of TIA using SR785 Spectrum Analyser and Zero SimulationInput Referred noise to be calculated for
trans-impedance.

Attachment 1: The Circuit
 TIA.pdfNoise_across_TIA.pdfNoise_across_TIA.pdfpowersupply.pdf 
  2385   Fri Aug 9 21:10:48 2019 Shalika SinghNoise Budget2micronLasersNoise Analysis of Circuit using SR785 Spectrum Analyser and Zero SimulationInput Referred noise is calculated for
the circuit that is to be used for characterization
of photodiodes. For the biasing 12V was used
 6x 
ELOG V3.1.3-