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ID Date Author Type Category Subject Text   51   Fri Feb 5 20:37:06 2010 Tara Chalermsongsak Laser RefCav better pointing alignment  After adjusting the mirror for reflecting beam back to the AOM, the QPD signal shows the better alignment. Before the voltage      52   Fri Feb 5 20:53:58 2010 Frank Laser RefCav latest values for refcav values for  VCO pwr 4.7V RCTRANSPD signal: 5.17V DC-level of RF-PD:      53   Fri Feb 5 21:10:48 2010 Frank Laser RefCav new PD for frequency-shifted power detection added a detector behind the curved mirror to measure the changes in deflected power (1.order) while changing the frequency of      54   Fri Feb 5 21:53:13 2010 Frank Laser RefCav strange things going on in order to get an idea about the part/subsystem causing the RF power modulation while sweeping the VCO frequency i changed the length of      55   Sat Feb 6 12:19:14 2010 rana Laser RefCav strange things going on  Seem like a screwy AOM. I would take the double-passed      56   Sun Feb 7 18:29:06 2010 Frank Laser Laser new channels + changes added the following channels: C3:PSL-RCAV_DIFFPWR : diffracted power (single pass) measured behind curved      57   Sun Feb 7 20:56:03 2010 Frank Laser RefCav AOM power modulation & pointing seems like a bad AOM and an impedance matching problem together. exchanging the semi-rigid cable by other cables produces a lot of different      58   Mon Feb 8 18:08:53 2010 Frank Misc AOM thermal images of AOM took some images with the thermal imaging camera of the AOM installed in the PSL so far. The first three pictures show the AOM  9x    59   Mon Feb 8 18:12:46 2010 Frank Notes AOM impedance measurements measured the impedance from 70MHz to 90MHz for three different AOMs we had in the lab - two Isomet 1205C-843 and one Crystal Technologies      60   Mon Feb 8 18:27:42 2010 Tara Chalermsongsak Laser RefCav Chaging Isomet AOM to Crystal Tech AOM      61   Mon Feb 8 22:03:32 2010 Frank Laser RC noise new results everything is back, pointing is much much less, power modulation too, ugf of the other loop is much higher - but nevertheless the      62   Tue Feb 9 18:33:59 2010 Frank Laser RC noise even newer results measured a couple of times today with everything re-aligned and different gain settings for the FSS stuff. Measured also to lower frequencies.      63   Wed Feb 10 04:01:50 2010 rana Laser RC noise even newer results Looking better. I'm curious about what the existing loop shapes are. The old FSS hardware is designed to drive an NPRO + 1      64   Wed Feb 10 18:04:01 2010 Tara Chalermsongsak Laser RefCav QPD calibration Today I calibrated the QPD on the ref cavity. The armlength from AOM to the quad is 2.1 m.      65   Fri Feb 12 12:46:38 2010 Tara Chalermsongsak Laser Laser a picture of beam path on the optic bench I took a picture of the setup in PSL lab, and drew a line for laser path. I omit the mode cleaning part since it's      66   Tue Feb 16 19:33:53 2010 Frank Laser Laser several shutdowns the last days we had several shutdowns of the laser within the last days. A couple of times the well known "HT error", today we had      67   Wed Feb 17 15:40:04 2010 Frank Laser Laser old 100mW NPRO does anyone know the typical operating current for the 100mW lightwave laser model ? (M126N-1064-100) It's typically ~1.1A for      68   Thu Feb 18 15:07:39 2010 Frank Misc Laser both IR viewers missing so please bring it back - we are waiting for it and can't go on without those... For the future: if you take it, bring it back      69   Fri Feb 19 00:31:40 2010 Frank Laser Laser 100mW lightwave NPRO slope Peter gave me the hint that the default values are stored in an eeprom in the laser head. So connecting the head to a driver      70   Fri Feb 19 18:23:24 2010 Tara Chalermsongsak Laser RefCav alignment for measuring beat between 2 cavities I finished aligning the beams from Ref cavity and Acavity, broke a connector on the PD we were going to used to measure the      71   Mon Feb 22 11:25:51 2010 Frank Laser Laser laser fault again the laser stopped working while beeing in the lab but not touching the laser or table or anything. I was looking for an EOM      72   Mon Feb 22 16:21:43 2010 Frank, Tara Laser RC noise both cavities locked, optimizing beat signal tuned 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 Chalermsongsak Laser RefCav beat 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 Chalermsongsak Laser RefCav successfully 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 rana Laser RefCav successfully use ifr2023 to track the frequncy drift of the beat Volts? 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 Chalermsongsak Laser RC noise calibrating ifr2023 The calibration for ifr203 input for external frequency modulation is       77   Wed Feb 24 20:07:00 2010 Tara Chalermsongsak Laser RC noise RC 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 Chalermsongsak Laser RC noise Noise floor from PD and SR560 Noise floor from PD and SR560 are measured, then converted from V/rHz to frequncy/rHz by the calibration from IFR2023 (0.7 MHz/Volt).      79   Fri Feb 26 11:40:47 2010 Frank Computing DAQ acav VME crate stopped working last night one of the DAQ cards failed and the acav crate stopped working, so also the temp stabilization of the analyzer cavity      80   Fri Feb 26 15:15:56 2010 Tara Chalermsongsak Laser RC noise quarter wave plate added/power from Ref and A Cavs measured I 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 rana Laser RC noise Noise Budget        82   Mon Mar 1 17:52:46 2010 Tara Chalermsongsak Laser RC noise New Result I 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 rana Laser RC noise Noise Budget 40m entry on RIN induced thermo-optic noise here      84   Wed Mar 3 08:46:26 2010 rana Laser RC noise Noise as measured by the 40m MC This link points to a measurement of the frequency noise at the 40m.      85   Wed Mar 3 15:59:10 2010 Tara Chalermsongsak Laser RC noise Noise 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 Chalermsongsak Laser RC noise Noise from VCO VCO 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 Frank Laser RC noise Noise from VCO                                88   Fri Mar 5 14:40:21 2010 Frank Laser RC noise Noise from VCO                                89   Thu Mar 11 22:45:58 2010 Tara Chalermsongsak Laser RC noise VCO f noise I measured the VCO noise again.  2 methods that I tried 1) Measuring noise from a) suppressed      90   Tue Mar 23 00:26:43 2010 Frank, Tara Misc RefCav ongoing work over the weekend we baked the two AR-coated windows for the new chamber.  Bob doesn't need the oven the next couple of days so      91   Tue Mar 23 21:17:56 2010 Frank, Tara Misc RefCav foam cut & partly assembled we've cut the rest of the foam parts to fit on the smaller diameter (the main tube with the heaters). We already started to      92   Thu Mar 25 13:05:59 2010 Frank Misc RefCav all parts baked by now all parts are baked and ready for assembly. The only part we couldn't bake is the chamber itself. But Bob said that      93   Mon Mar 29 17:46:41 2010 Frank, Tara Misc RefCav assembled new vacuum chamber we cleaned and assembled the new vaccum chamber. we installed an electical feedtrough (for sensors      94   Wed Mar 31 20:46:22 2010 Frank Misc RefCav ion pumps i've made a cable to test the two Varian ion pumps we have.  Before we move the cavity to the new chamber i would like to      95   Thu Apr 1 15:38:38 2010 Frank Misc DAQ RT DAQ equipment arrived this afternoon the PSL RT DAQ equipment arrived and we moved all the stuff down to the PSL lab. We now have to expansion chassis,      96   Fri Apr 2 00:35:00 2010 Frank Misc RefCav new chamber almost ready the new chamber is almost ready. I've attached three of four heaters, the fourth one has a fabrication error and has to be replaced.      97   Tue Apr 6 18:39:04 2010 Tara Chalermsongsak Laser RefCav Calculation 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 rana Laser RefCav Calculation for higher order mode's frequency I 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 Chalermsongsak Laser RefCav Calculation for higher order mode's frequency There's a correction 1) the beam waist inside the cavity, it seems that the 237 um(which corresponds      100   Fri Apr 9 21:34:15 2010 Frank Computing DAQ new RT system i assembled everything and made all the cables for power distribution etc. I also got (the last) timing slave from Rolf.

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