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ID Date Author Type Category Subject Text   2245   Wed Aug 22 00:42:42 2018 awade DailyProgress WOPO New PZT mounted mirror Koji showed me the collection of PZTs at the 40m.  I've epoxied a 9 mm mirror to the end of a P-810.10 peizo      2247   Thu Aug 23 12:49:17 2018 awade DailyProgress WOPO New PZT mounted mirror mounted The bake overnight settled at 64 C.  This wasn't quiet the minimum recomended for EPO-TEK 353ND but      2255   Fri Oct 12 19:05:51 2018 awade DailyProgress WOPO Gluing 532 nm PZT mirror I'm making a PZT mounted 532 nm mirror, so I have some independant control of the pumping light phase for optimizing the classical      2257   Mon Oct 29 19:05:58 2018 awade DailyProgress WOPO Fixing MM into 532nm collimator After a number of changes to the path for the pump light (532 nm) it has be very difficult to get any decent amount of pumping power      2262   Wed Nov 28 12:14:35 2018 awade DailyProgress WOPO Mode field diameter choosing best patch for WOPO input There is some loss in fiber-to-fiber connection when there is a different mode field diameter between the two.  Ideally one would      2268   Tue Dec 4 19:34:22 2018 awade DailyProgress WOPO Diabolo 532 nm power drop and retuning I restarted the Diabolo laser after it had been shut down for a lab tour.  The using the throlabs S130C head the 1064      2273   Thu Dec 6 20:04:50 2018 awade DailyProgress WOPO Diabolo 532 nm power drop and retuning I've continued to have problems getting the Diabolo laser SHG to lock.  I get nice clean fundamental resonance      2277   Fri Dec 7 20:31:06 2018 awade DailyProgress WOPO Diabolo: cleaning dust out of SHG unit, self heating issues I've managed to vastly improve the power output of the SHG by doing a little cleaning inside the box.      2280   Thu Dec 13 14:01:13 2018 awade DailyProgress WOPO Diabolo: contacted coherent I've contacted the people at Coherent about getting instructions for repair or whether they can still service this unit      2281   Thu Dec 13 16:24:06 2018 awade DailyProgress WOPO Diabolo: baseline numbers for coherent Some numbers for the Diabolo laser for reference (to quote to Coherent, if they get back to us with help).      2283   Wed Dec 19 16:48:18 2018 awade DailyProgress WOPO Diabolo: baseline numbers for coherent Contact with Coherent re Diabolo I got in contact with Coherent they have provided some instructions on aligning the laser cavity,      2284   Thu Dec 20 19:20:50 2018 awade DailyProgress WOPO Diabolo: trialing SHG oven set temperature points to see if there is a maxima when locked The strategy locking at lower laser power and optimizing phase matching temperature by slowly walking the temperature and laser      2286   Fri Dec 21 15:33:26 2018 Koji DailyProgress WOPO Diabolo: trialing SHG oven set temperature points to see if there is a maxima when locked This means that you want to make the SHG crystal longer. Is that true? If so, can you change the temperature for the optimal      2287   Fri Dec 21 15:51:27 2018 awade DailyProgress WOPO Diabolo: trialing SHG oven set temperature points to see if there is a maxima when locked No I don't think so.  The temperature of the oven is important for the phase matching condition.  Its the nob you can turn      2289   Mon Dec 24 10:08:49 2018 awade DailyProgress WOPO Diabolo: back to power with deliberate pre-misalignment I think I've managed to bring the power of the Diabolo back to a usable level for WOPO.      2290   Mon Dec 24 12:07:18 2018 Koji DailyProgress WOPO Diabolo: back to power with deliberate pre-misalignment Great recovery job!        2291   Mon Dec 24 16:46:41 2018 awade DailyProgress WOPO MM into 532 nm patch fiber (to be hooked up to WOPO) I had another look at MM the 532 nm light into the P3-460B-FC-2 patch cable.  After walking some lens positions      2296   Wed Feb 20 10:38:46 2019 awade DailyProgress WOPO Fixing 532 nm polarization linearity issues Alignment of the pumping 532 nm polarization into the WOPO is important to getting the correct phase matching condition.  For      2297   Thu Feb 21 17:02:24 2019 awade DailyProgress WOPO Mixing down homodyne output from 1 MHz I want to get signal from about 1 MHz down to around DC from my subtracted  homodyne photodetectors. I'm planning to do something      2298   Fri Feb 22 14:05:09 2019 awade DailyProgress WOPO Mixing down homodyne: 5th order elliptic filter (100 kHz) Making 5th order Elliptical Filter I couldn't find any filters that would cut off above 100 kHz so I made my own using      2300   Thu Feb 28 16:00:59 2019 awade DailyProgress WOPO Pol launch into PM fiber I've set up a rotating PBS and half-wave plate to provide polarization adjustment into the 532 nm fiber without misalignment      2303   Tue Mar 12 16:35:43 2019 awade DailyProgress WOPO Pol launch into PM fiber 1064 nm I've replaced the SM fiber in the 1064 nm launch with a PM fiber (P3-1064PM-FC-5). I also moved the fiber collimator (F240APC-1064)      2304   Tue Mar 12 16:58:50 2019 awade Misc WOPO Todo list W11 These are things to get do this week on WOPO experiment: ☑️ Reinstall 50:50      2305   Wed Mar 13 12:44:41 2019 awade, anchal DailyProgress WOPO Pol launch into PM fiber 1064 nm [awade, anchal ] After a bit of reading I've realized that the standard use of these PM      2306   Wed Mar 13 17:49:14 2019 awade Summary WOPO Damage threshold estimates for optical fibers This is just a note about damage tolerances for fibers so we have a reference of the amount of power that can be used.        2316   Wed Mar 27 20:37:38 2019 awade DailyProgress WOPO Measuring TF Homodyne Photo Detector for WOPO experiment Initial measurment of PD TF I realize I never really measured the signal transfer function for each of these Photo      2318   Fri Mar 29 16:00:21 2019 awade DailyProgress WOPO Remeasuring TF Homodyne Photo Detector B after switching out foil cap This set of measurments turned out to be bad.      2324   Wed Apr 10 13:10:45 2019 awade DailyProgress WOPO Rebuild of WOPO homodyne detectors using AD829 [awade] This post details the rebuild I made of the transimpedance amplifiers (TIA)      2327   Mon Apr 22 19:35:16 2019 anchal and awade Summary WOPO Shot Noise Intercept Current measurement of Photodiodes Andrew measured the output voltage noise of photodiodes through an AC coupled pre-amplifier (G=200, 0.7 nV/rtHz) while varying the      2331   Tue Apr 30 19:52:14 2019 awade Howto WOPO Configuring Zurich box server As I couldn't find this on the 40m elog/wiki I'm putting notes here on how to configure a fresh webserver + python server      2332   Wed May 1 14:34:53 2019 awade DailyProgress WOPO Output chain and demodulation of squeezing signal The detectors have been verified to have a low intercept current, that will give us good clearance of our shot noise to dark      2345   Thu May 16 16:52:46 2019 awade Howto WOPO Zurich box python access The Zurich box can also be accessed via a python API.  Its a little bit opaque in some points on how this works as their      2349   Wed May 22 15:07:09 2019 awade DailyProgress WOPO Demodulation and subtraction for homodyne detector with Zurich box For the detection of squeezed light the homodyne detector  is now configured for digital subtraction in post processing.      2352   Thu May 23 15:29:58 2019 awade DailyProgress WOPO Making time domain measurement of noise power in homoydne with WOPO pump on In order to see squeezing I want to scan the phase of the homodyne relative to the squeezed light and see the variations in      2354   Sun May 26 21:24:38 2019 awade DailyProgress WOPO Excess noise when pumping: checklist for Monday. There are a few other possibilities for the excess noise when injecting pump, this is a checklist for me to run through      2356   Wed May 29 15:24:33 2019 awade DailyProgress WOPO Update to checklist I had a look at a few of these things.  I've found that it doesn't seem to be caused by heating of the beam splitter,      2723   Tue Feb 22 07:53:06 2022 Yehonathan Update WOPO Waking up WOPO {Shruti, Yehonathan} On Friday, we came down to QIL to poke around the WOPO setup. The first      2725   Fri Feb 25 17:09:53 2022 shruti Update WOPO Waking up WOPO - green beam [shruti, yehonathan] SHG and 532 nm beam alignment Yehonathan brought over 532nm/1064nm laser goggles from      2727   Wed Mar 2 14:38:55 2022 Yehonathan Update WOPO Waking up WOPO - some more fiddling and a plan {Shruti, Yehonathan} We made some a list of some random questions and plans for the future. We then      2728   Fri Mar 4 11:49:45 2022 shruti Update WOPO Waking up WOPO - attempts at readout [Yehonathan, Shruti] 1. Doubling cavity and green beam Since we had left the lasers ON with the shutters      2731   Thu Mar 10 17:12:01 2022 awade Update WOPO Waking up WOPO - attempts at readout [awade] Good to see this experiment being revived.      2733   Wed Mar 16 12:22:44 2022 Yehonathan Update WOPO Waking up WOPO - attempts at readout {Shruti, Yehonathan} Yesterday, we measured a bunch of noises.      2735   Tue Mar 22 09:19:38 2022 shruti Update WOPO Waking up WOPO - back to green path [Yehonathan, Shruti] Yesterday we went back to fiddling with the green path. Soon after opening the      2759   Wed Apr 20 00:12:12 2022 Yehonathan Update WOPO Still figuring out the readout electronics and fixing of some stuff {Yehonathan, Shruti} 1. Grabbed 30Hz-3GHz HP spectrum analyzer from the Cryolab. Installed it in      2760   Thu Apr 21 10:33:33 2022 shruti Update WOPO Still figuring out the readout electronics and fixing of some stuff [Yehonathan, Shruti]   First we turned on the relevant      2762   Mon Apr 25 11:08:35 2022 Yehonathan Update WOPO Still figuring out the readout electronics and fixing of some stuff {Shruti, Yehonathan} We realized that the PD amp circuit only requires a 5V DC supply so we try that.      2764   Thu Apr 28 14:12:20 2022 Yehonathan Update WOPO Still figuring out the readout electronics and fixing of some stuff {Shruti, Yehonathan} We went to the e-shop to investigate the PD circuits. Completely confused about      2777   Thu Jun 2 10:28:26 2022 Yehonathan Update WOPO Installing 1811 PDs [Shruti, Yehonathan] We took newport 1811 PDs, one from CTN lab (suspicious) and one      2796   Wed Jul 20 15:55:41 2022 Yehonathan Update WOPO Installing 1811 PDs {Yehonathan, Paco} We comfirmed that the DC ouput of one of the 1811s is bad. We set out to      2800   Tue Aug 23 22:23:06 2022 awade Update WOPO Installing 1811 PDs I recall at one point we had one of these NF1811 with a broken power suply pin.  It was from a limited production run with the

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