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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Typeup Category Subject
  78   Mon Jul 26 18:47:12 2010 James KMiscHartmann sensorHex Grid Analysis Errors and Thermal Defocus Noise

My previous eLog details how the noise in Hartmann Sensor defocus measurements appears to vary with ambient light. New troubleshooting analysis reveals that the rapid shifts in the noise were still related to the ambient light, sort of, but that ambient light is not the real issue. Rather, the noise was the result of some trouble with the centroiding algorithm.

The centroiding functions I have been using can be found on the SVN under /users/aidan/cit_centroid_code. When finding centroids for non-uniform intensity distributions, it is desirable to avoid simply using a single threshold level to isolate individual spots, as dimmer spots may be below this threshold and would therefore not be "seen" by the algorithm. The centroiding functions used here get around this issue by initially setting a relatively high threshold to find the centroids of the brighter spots, and then fitting a hexagonal close-packed array to these spots so as to be able to infer where the rest of the spots are located. Centroiding is then done within small boxes around each estimated centroid location (as determined by the hexagonal array). The functions "find_hex_grid.m" and "flesh_out_hex_grid.m" serve the purpose of finding this hexagonal grid. However, there appear to be bugs in these functions which compromise the ability of the functions to accurately locate spots and their centroids.

The centroiding error can be clearly seen in the following plot of calculated centroids plotted against the raw image from which they were calculated:

centerror.PNG

At the bottom of the image, it can be seen that the functions fail at estimating the location of the spots. Because of this, centroiding is actually being done on a small box surrounding each point which consists only of the background of the image. This can explain why these centroids were calculated to have much larger displacements and shifted dramatically with small changes in ambient light levels. The centroiding algorithm was being applied to the background surrounding each of these points, so it's very reasonable to believe that a non-uniform background fluctuation could cause a large shift in the calculated centroid of each of these regions.

It was determined that this error arose during the application of the hex grid by going through the centroiding functions step-by-step to narrow down where specifically the results appeared to be incorrect. The function's initial estimate for the centroids right before the application of the hex grid  is shown plotted against the original image:

centinit.png

The centroids in this image appear to correspond well to the location of each spot, so it does not appear that the error arises before this point in the function. However, when flesh_out_hex_grid and its subfunction find_hex_grid were called, they produced the following hexagonal grid:

hexgrid.png

It can be seen in this image that the estimated "spot locations" (the intersections of the grid) near the bottom of the image differ from the actual spot locations. The centroiding algorithm is applied to small regions around each of these intersections, which explains why the calculated "spot centroids" appear at incorrect locations.

It will be necessary to fix the hexagonal grid fitting so as to allow for accurate centroiding over non-uniform intensity distributions. However, recent experiments in measuring thermally induced defocus produce images with a fairly uniform distribution. It should therefore be possible to find the centroids of the images from these experiments to decent accuracy by simply temporarily bypassing the hexagonal-grid fitting functions. To demonstrate this, I analyzed some data from last week (experiment 72010a). Without bypassing the hex-grid functions, analysis yielded the following results:

72010a.png

However, when hexagonal grid fitting was bypassed, analysis yielded the following:

72010a_nohex.PNG

The level of noise in the centroid displacement vs. centroid location plot, though still not ideal, is seen to decrease by nearly two orders of magnitude. This indicates that bypassing or fixing the problems with the hexagonal grid fitting functions should enable a more accurate measurement of thermally induced defocus in future experiments.

  91   Tue Aug 17 22:34:14 2010 ranaMiscGeneralETM temperature after a 1W step

This attachment is a Shockwave Flash animation of the iLIGO ETM getting a 1 W beam with a 3.5 cm radius getting fully absorbed onto the surface at t = 0.

Attachment 1: etmt.swf
  112   Thu Feb 24 14:20:55 2011 AidanMiscRing HeateraLIGO H2 Ring Heater Pics

 Here are some pictures of the ring heater segments destined for the H2 Y-arm this year.

 These still need to be put onto ResourceSpace.

Attachment 1: aLIGO_Ring_Heaters.zip
  116   Tue Mar 1 10:47:18 2011 AidanMiscHartmann sensorElectron to Counts conversion efficiency

Using some of the old data from James (attached below), I calculated the CCD conversion efficiency (CE) from electrons to bits (Counts).

Number of electrons(Ne) = QE*Number of Photons(Np)

noiseE = sqrt(Ne);

Number of Counts (NCo)= CE*Ne

Noise in Counts (noiseCo)= CE*sqrt(Ne)

noiseCo = sqrt(CE * NCo)

log(CE) = 2*noiseCo - NCo

Therefore CE = 10.0^(2*noiseCo - NCo)

From James's data on the intensity noise in the CCD, CE = 0.0269

 

Quote:
 
Using this function, I did the same analysis of the upper-left 200x200 pixels over all 200 images:

(data from 200 images, over the upper-left 200x200 pixels)

 

  156   Tue Nov 29 09:13:49 2011 ranaMiscLIGO 3GSwitching from CO2 to shorter wavelength solid state laser

 Around a year ago, Phil and I discussed the possibility of using an OPO to possibly generate our own laser beam at ~2 microns for TCS. This was to avoid all of the usual hassle of the 10 micron CO2 laser.

As it turns out, the 1.5-3 micron range doesn't have enough absorption in fused silica: the absorption depth would be basically the whole thickness of the optics and this is not so useful when trying to correct surface heating.

During my recent trip to JILA, Jan Hall mentioned to me that it should be possible to operate instead at ~5 microns, where laser technology may be solid state and where we can use Si:As detectors instead of the inefficient HgCdTe ones which we use now.

JWST, in partnerships with industry, have developed some Si:As detectors:  http://www.jwst.nasa.gov/infrared.html   

Some internet searching shows that there are now several laser technologies for the mid-IR or MWIR range. Some are <1 W, but some are in the ~10 W range.

Of course, its possible that we'll switch to Silicon substrates, in which case we need to re-evaluate the goals and/or existence of TCS.

  157   Tue Jun 5 17:25:43 2012 Alex MauneyMiscaLIGO Modeling6/5/12 Daily Summary

- Had a meeting to talk about the basics of LIGO (esp. TCS) and discuss the project

- Created COMSOL model for the test mass with incident Gaussian beam.

- Added a ring heater to the previous file

- Set up SVN for the COMSOL repository

  158   Wed Jun 6 16:54:09 2012 Alex MauneyMiscaLIGO Modeling6/6/12 Daily Summary

- Got access to and started working with SIS on Rigel1

- Fixed SVN issues

- Refined COMSOL model parameters and worked on a better way to implement the heating ring to get the astigmatic heating pattern.

  159   Thu Jun 7 00:23:11 2012 Aditi MittalMiscLIGO 3GSummary June 5 and June 6, 2012

 June 5

-Discussed the actual project outline 

-Installed Comsol on the system

-Learned the basics of Comsol with the help of tutorials available on 40m wiki

and others.

 

June 6

-Made few simple models in Comsol 

-Studied LIGO GWADW slides for a better understanding of the project.

-Setup SVN to access remote repository.

 

 

 

  160   Thu Jun 7 16:50:16 2012 Alex MauneyMiscaLIGO Modeling6/7/12 Daily Summary

- Created a COMSOL model with thermal deformations

- Added non-symmetrical heating to cause astigmatism

- Worked on a method to compute the optical path length changes in COMSOL

  161   Thu Jun 7 23:24:56 2012 Aditi MittalMiscLIGO 3GSummary June 7, 2012

-Created a COMSOL model for variation of temperature in two mass system.

-Used the above model for cryogenic conditions.

-checked it analytically.

  162   Fri Jun 8 16:36:47 2012 Alex MauneyMiscaLIGO Modeling6/8/12 Daily Summary

- Tried to fix COMSOL error using the (ts) module, ended up emailing support as the issue is new in 4.3

- Managed to get a symmetric geometric distortion by fixing the x and y movements of the mirror to be zero (need to look for a better way to do this as this may be unphysical)

- Worked on getting the COMSOL data into SIS, need to look through the SIS specs to find out how we should be doing this (current method isn't working well)

 

  163   Fri Jun 8 23:51:13 2012 Aditi MittalMiscLIGO 3GSummary June 8, 2012

-Created a COMSOL model for cryogenically shielded test mass with compensation plate.

-Analyzed the behavior of the model in different size configurations.

  164   Mon Jun 11 17:11:01 2012 Alex MauneyMiscaLIGO Modeling6/11/12 Daily Summary

- Fixed the (ts) model, got strange results that indicate that the antisymmetric heating mode is much more prominent than previously thought

- Managed to get COMSOL data through matlab and into SIS

 

  165   Mon Jun 11 20:53:31 2012 Aditi MittalMiscLIGO 3GSummary June 11, 2012

 -Continued with the same cryogenic model created and varied the length of  outer shield and studied the temperature variation inside.

-Compared the temperature difference given by COMSOL with manually calculated one.

  166   Wed Jun 13 16:36:14 2012 Alex MauneyMiscaLIGO Modeling6/12 and 6/13 Daily Summary

- Realized that the strange deformations that we were seeing only occur on the face nearest the ring heater, and not on the face we are worried about (the HR face)

- Read papers by Morrison et al. and Kogelnik to get a better understanding of the mathematics and operations of the optical cavity modeled in SIS

- Read some of the SIS manual to better understand the program and the physics that it was using (COMSOL licenses were full)

  167   Thu Jun 14 05:37:30 2012 Aditi MittalMiscLIGO 3GSummary June 13, 2012

-Derived formula for manual calculation of temperature due to total influx.

-Compared the results by COMSOL and by the formula.

  168   Thu Jun 14 16:51:03 2012 Alex MauneyMiscaLIGO Modeling6/14/12 Daily Summary

- Plugged the output of the model with uniform heating into SIS using both modification of the radius of curvature, and direct importation of deflection data

- Generated a graph for asymmetric heating and did the same

- Aligned axes in model to better match with the axes in MATLAB and SIS so that the extrema in deflections lie along x and y (not yet implemented in the data below)

Attachment 1: SIS_Outputs.txt
Unchanged field:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   FP cavity modal analysis using cold optics parameters
 
ROC(ITM) = 1934, ROC(ETM) = 2245, Cavity lenggth = 3994.499999672, total Gouy = 2.7169491305278
Fval(ITM) = -4297.7777755379, OPL(ITM) = 0.13793083662307, Fval(ETM) = -4988.8888885557
waist size = 0.01203704073212, waist position from ITM = 1834.2198819617, Rayleigh range = 427.80682127602
 
Mode parameters of cavity fields
ETM AR (out base) : w = 0.0619634      R = 1548.276       z  = 1519.925       z0 = 207.583        w0 = 0.008384783   
... 138 more lines ...
Attachment 2: Assymetric_Heating_Line_Graph.png
Assymetric_Heating_Line_Graph.png
  169   Mon Jun 18 16:30:36 2012 Alex MauneyMiscaLIGO Modeling6/18/12 Daily Summary

- Verified that the SIS output does match satisfy the equations for Gaussian beam propagation

- Investigated how changing the amount of data points going into SIS changed the output, as well as how changes in the astigmatic heating effect the output

     + The results are very dependent on number of data points (similar order changes to changing the heating)

     + Holding the number of data points the same, more assymetric heating tends to lead to more power in the H(2,0) mode, and less in the H(0,2)

 

  170   Mon Jun 18 23:42:39 2012 Aditi MittalMiscLIGO 3GCryogenic Shielding

 -Read about blue team design for maximum power budget.

-Read third generation talks to get a better understanding of the work. 

  171   Tue Jun 19 16:24:52 2012 Alex MauneyMiscaLIGO Modeling6/19/12 Daily Summary

- Did more modeling for different levels of heating and different mesh densities for the SIS input.

- Lots of orientation stuff

- Started on progress report.

  172   Wed Jun 20 16:44:58 2012 Alex MauneyMiscaLIGO Modeling6/20/12 Daily Summary

- Attended a lot of meetings (Safety, LIGO Orientation)

- Finished draft of week 3 report (images attached)

 

Attachment 1: TS_model_deformation_line_graph_2W_10%.png
TS_model_deformation_line_graph_2W_10%.png
Attachment 2: TS_model_deformation_line_graph_2W_10%_sym.png
TS_model_deformation_line_graph_2W_10%_sym.png
Attachment 3: TS_model_deformation_line_graph_2W_10%_antisym.png
TS_model_deformation_line_graph_2W_10%_antisym.png
Attachment 4: TS_model_deformation_contour_graph_2W_10%.png
TS_model_deformation_contour_graph_2W_10%.png
Attachment 5: HTSM_model_deformation_contour_graph_2W_10%.png
HTSM_model_deformation_contour_graph_2W_10%.png
  173   Thu Jun 21 11:16:27 2012 Aditi MittalMiscLIGO 3GSummary June 19 and 20, 2012

 -Attented LIGO orientation meeting and safety session.

-Prepared 3 week report

 

Attachment 1: temp_of_test_mass.png
temp_of_test_mass.png
  174   Thu Jun 21 16:54:45 2012 Alex MauneyMiscaLIGO Modeling6/21/12 Daily Summary

- Paper edits and more data generation for the paper (lower resolution grid data)

- Attended a talk on LIGO

 

  175   Thu Jun 21 18:35:44 2012 Aditi MittalMiscLIGO 3GSummary June 21, 2012

 -Updated 3 week progress report with new additions and deletions.

-Attended LIGO lecture which was very interesting and full of information.

  176   Tue Jun 26 17:55:44 2012 Aditi MittalMiscLIGO 3GSummary June 26, 2012

- Discussed the further project with Dr. Brooks.

-Tried to derive formula for the test mass inside cryogenic shield(infinitely long shield from one side)

 

 

 

  177   Wed Jun 27 16:43:56 2012 Alex MauneyMiscaLIGO Modeling6/27/12 Daily Summary

Plan for building the model

- Find the fields that would be incident on the beam splitter from each arm (This is done already)

- Propagate these through until they get to the OMC using the TELESCOPE function in SIS

- Combine the fields incident on the OMC in MATLAB and minimize the power to get the input field for the OMC (Most of this is done, just waiting to figure out what kind of format we need to use it as an SIS input)

- Model the OMC as an FP cavity in SIS

    + Need to think about how to align the cavity in a sensible way in SIS (need to find out more about how they actually do it)

- Pick off the fields from both ends of the OMC-FP cavity for analysis

- Add thermal effects to one of the arms and see how that changes the fields, specifically how the signal to noise ratio changes

  178   Thu Jun 28 16:27:37 2012 Alex MauneyMiscaLIGO Modeling6/28/12 Daily Summary

- Finished the MatLab code that both combines two fields and simulates the adjustment of the beamsplitter to minimize the power out (with a small offset).

- Added the signal recycling telescope to the SIS code that generates the fields

To Do: Make the OMC cavity in SIS

 

  179   Fri Jun 29 15:51:24 2012 Aditi MittalMiscLIGO 3GSummary June 28 and 29, 2012

 -Discussed the project outline for next 6 weeks.

-made a write up for the tasks. (attached)

-Analyzed the variation of temperature of the test mass with input power for different lengths of the shield. 

Attachment 1: pipelength_power.xlsx
Attachment 2: 6week_plan.doc
  180   Mon Jul 9 16:54:17 2012 Alex MauneyMiscaLIGO Modeling7/9/12 Summary

Made a COMSOL model that can include CO2 laser heating, self heating, and ring heating

Figured out how to run SIS out of a script and set up commands to run the two SIS stages of the model

  188   Thu Sep 21 18:56:53 2017 awadeMiscBorrowedBorrowed thorlabs power meter

Borrowed thorlabs power meter on 21 Sep 2017.  It is on the south table of the ATF lab.

  223   Fri Oct 26 09:49:47 2018 AidanMiscOpticsStarting 80C cure of epoxy

I've started an 80C cure of two materials bonded by EPOTEK 353ND. The objective is to see (after curing) how much the apparent glass transition temperature is increased over a room-temperature cure.

Attachment 1: IMG_7054.jpg
IMG_7054.jpg
  243   Wed Oct 30 12:13:14 2019 JonMiscDelivery NoteNew lab hardware

Ian and I moved some new hardware into the lab, shown in the below photos. It is from the shipment of loaned equipment recently returned by Whitman College. 

Attachment 1:

  • ZnSe 1" dia. lenses (x2)
  • ZnSe 38.1 mm dia. windows (x2)

Attachment 2:

  • Synrad 20 W CO2 laser
  • Synrad laser controller

Attachment 3:

  • Intraaction Model GE modulator driver
  • Intraaction AOM

Attachment 4:

  • Second Intraaction Model GE modulator driver
  • Unknown optical cavity (was packaged together with the driver)

The ZnSe lenses and windows were put in the CO2 drawer of the optics cabinet. The CO2 laser, AOM, and modulator drivers were left packaged in boxes underneath the large laser table.

Attachment 1: IMG_3782.jpg
IMG_3782.jpg
Attachment 2: IMG_3783.jpg
IMG_3783.jpg
Attachment 3: IMG_3784.jpg
IMG_3784.jpg
Attachment 4: IMG_3785.jpg
IMG_3785.jpg
  245   Mon Jul 26 16:23:03 2021 AidanMiscFloodLab flooded from broken pipe leading to sump room

 

Koji: QIL/TCS entrance flooding. Check your lab

Anchal: Can someone take a look at CTN too?

Koij: TCS needs more people @aidan

Koji: CTN ok

Aidan: On my way

Shruti: Cryo seems fine

Aidan: There was a leak in a pipe in the wall of B265A. It was coming from the building air conditioner condensation overflow. Facilities has fixed the pipe and is working on clean-up

Attachment 1: IMG_3881.MOV
  246   Tue Jul 27 08:39:33 2021 AidanMiscFloodTuesday (27-Jul) morning check - lab looks okay

I checked the lab this morning. It was dry and there wall was in the same state as yesterday.

Attachment 1: Image_Pasted_at_2021-7-27_08-38-2.jpeg
Image_Pasted_at_2021-7-27_08-38-2.jpeg
Attachment 2: Image_Pasted_at_2021-7-27_08-38.jpeg
Image_Pasted_at_2021-7-27_08-38.jpeg
  248   Wed Aug 25 11:28:56 2021 AidanMiscFloodLab flooded from broken pipe leading to sump room

11:29AM - Lab has flooded again this morning. I'm calling PMA. Looks to be the same issue as before.

Quote:

 

Koji: QIL/TCS entrance flooding. Check your lab

Anchal: Can someone take a look at CTN too?

Koij: TCS needs more people @aidan

Koji: CTN ok

Aidan: On my way

Shruti: Cryo seems fine

Aidan: There was a leak in a pipe in the wall of B265A. It was coming from the building air conditioner condensation overflow. Facilities has fixed the pipe and is working on clean-up

 

  249   Thu Aug 26 09:00:39 2021 AidanMiscFloodLab flooded from broken pipe leading to sump room

Some photos of water and clean-up.

Summary: I came into the lab around 11:30AM and found water on the floor in the changing room outside QIL/TCS. Turns out the condesation overflow pipe from the AC blew out again. This time near the ceiling. Water was on the floor but also had sprayed a little onto the tool chest and East optical table. A few optics got wet on the table. Initial inspection looks like electronics were spared with the exception of the "broken" spectrum analyzer that was on the floor. 

Facilities came in and cleaned up the water. A small amount got into QIL but stayed near the door as the lab floor slopes up from the door area. They fixed the pipe and were looking into whether there was a blockage cuasing this problem. PMA was notified and John Denhart is coordinating follow-up.

Triage effort: given the AC was still active, John and I strung a temporary tarp across the two tables to block any spray.

Quote:

11:29AM - Lab has flooded again this morning. I'm calling PMA. Looks to be the same issue as before.

Quote:

 

Koji: QIL/TCS entrance flooding. Check your lab

Anchal: Can someone take a look at CTN too?

Koij: TCS needs more people @aidan

Koji: CTN ok

Aidan: On my way

Shruti: Cryo seems fine

Aidan: There was a leak in a pipe in the wall of B265A. It was coming from the building air conditioner condensation overflow. Facilities has fixed the pipe and is working on clean-up

 

 

Attachment 1: 20210825_-_TCS_Lab_Flood_-_compressed.pdf
20210825_-_TCS_Lab_Flood_-_compressed.pdf 20210825_-_TCS_Lab_Flood_-_compressed.pdf 20210825_-_TCS_Lab_Flood_-_compressed.pdf 20210825_-_TCS_Lab_Flood_-_compressed.pdf 20210825_-_TCS_Lab_Flood_-_compressed.pdf 20210825_-_TCS_Lab_Flood_-_compressed.pdf 20210825_-_TCS_Lab_Flood_-_compressed.pdf 20210825_-_TCS_Lab_Flood_-_compressed.pdf
  90   Tue Aug 17 16:31:55 2010 AidanThings to BuyLaserBought a laser diode from Thorlabs for HWS

http://www.thorlabs.com/thorProduct.cfm?partNumber=CPS180

I bought this laser diode from Thorlabs today to try the current modulation trick Phil and I discussed last Friday. 

That is:

  1. Accept that there will be interference fringes on the Hartmann sensor probe beam with a laser diode source (especially if the probe beam is the retro-reflection from a Michelson interferometer with a macroscopic arm length difference)
  2. Modulate the current of the laser diode source to vary its wavelength by a few hundreds on nm. Do this on a time scale that is much faster than the exposure time for a Hartmann sensor measurement
  3. The contrast of the interference fringes should average out and the exposure should appear to be the sum of two incoherent beams.

 

 

 

  93   Mon Aug 23 08:43:16 2010 AidanThings to BuyLaserBought a laser diode from Thorlabs for HWS

It arrived on Friday.

Quote:

http://www.thorlabs.com/thorProduct.cfm?partNumber=CPS180

I bought this laser diode from Thorlabs today to try the current modulation trick Phil and I discussed last Friday. 

That is:

  1. Accept that there will be interference fringes on the Hartmann sensor probe beam with a laser diode source (especially if the probe beam is the retro-reflection from a Michelson interferometer with a macroscopic arm length difference)
  2. Modulate the current of the laser diode source to vary its wavelength by a few hundreds on nm. Do this on a time scale that is much faster than the exposure time for a Hartmann sensor measurement
  3. The contrast of the interference fringes should average out and the exposure should appear to be the sum of two incoherent beams.

 

 

 

 

  106   Fri Feb 18 13:26:23 2011 AidanThings to BuyDelivery NoteFirst parts of Bosch framing have arrived from Valin

The first pieces of the Bosch framing have arrived from Valin Corporation. These are just small pieces such as the fasteners and the gussets. There are no custom lengths of framing yet.

The details are in the attached Packing List. [1:25PM] I haven't verified that everything is there yet.

 

Attachment 1: Packing_List_01.pdf
Packing_List_01.pdf Packing_List_01.pdf
  108   Wed Feb 23 18:04:38 2011 AidanThings to BuyDelivery NoteFirst parts of Bosch framing have arrived from Valin

Quote:

The first pieces of the Bosch framing have arrived from Valin Corporation. These are just small pieces such as the fasteners and the gussets. There are no custom lengths of framing yet.

The details are in the attached Packing List. [1:25PM] I haven't verified that everything is there yet.

 

 Another box of Bosch stuff arrived in my office. The packing list is attached

Attachment 1: Packing_List_02.pdf
Packing_List_02.pdf Packing_List_02.pdf
  111   Thu Feb 24 13:35:41 2011 AidanThings to BuyDelivery NoteBosch framing has arrived

 The custom pieces of the Bosch framing have arrived. Transportation is currently moving them downstairs to the lab. The packing list is attached.

 

 

Attachment 1: Packing_List_03.pdf
Packing_List_03.pdf Packing_List_03.pdf
  117   Tue Mar 1 11:19:34 2011 AidanThings to BuyDelivery NoteMFF001 flipper mirror has arrived

 The Thorlabs MFF001 flipper mirror recommended by Bram has arrived. The delivery note is attached.

Attachment 1: Flipper_mirror_delivery_notice.pdf
Flipper_mirror_delivery_notice.pdf
  118   Tue Mar 1 11:21:37 2011 AidanThings to BuyDelivery NoteMore Bosch framing parts - angle connectors

 Another box of Bosch framing parts arrived today. The delivery note is attached.

Attachment 1: Packing_List_04.pdf
Packing_List_04.pdf
  124   Tue Mar 8 18:57:50 2011 AidanThings to BuyDelivery NoteFiber optics cable and Bosch Fastener
Attachment 1: deliveries_2011-03-08.pdf
deliveries_2011-03-08.pdf deliveries_2011-03-08.pdf
  133   Mon Apr 4 13:13:23 2011 AidanThings to BuyDelivery NoteNewfocus 5102 mirrors and Firewire extension cable have arrived

 See attached delivery note ...

Attachment 1: receipt_mirrors.pdf
receipt_mirrors.pdf receipt_mirrors.pdf
  136   Sun Apr 17 14:59:36 2011 AidanThings to BuyDelivery NoteL-Com patch panel, Newport lenses, Thorlabs fibers delivery notes
Attachment 1: newport_lenses_2011-03.pdf
newport_lenses_2011-03.pdf
Attachment 2: L-Com_patch_panel_-_2011-03.pdf
L-Com_patch_panel_-_2011-03.pdf
Attachment 3: thorlabs_fiber_optic_cables_2011-03.pdf
thorlabs_fiber_optic_cables_2011-03.pdf thorlabs_fiber_optic_cables_2011-03.pdf
  139   Mon Apr 18 15:06:53 2011 AidanThings to BuyHartmann sensorOrdered 2" optics from Newport

 Given that the HWS requires several 2" optics to handle the big beam size, I've ordered the following items from Newport:

  • 2x 2" 50/50 beam splitter: 20B20BS.2
  • 6x 2" NIR mirrors: 5122
  • 8x 2" Ultima mirror mounts: U200-A2K
  232   Mon Jul 22 18:44:53 2019 Edita BytyqiThings to BuyGeneralNeed to Order Gloves

Small/Medium size gloves need to be ordered in order to handle the optics carefully.

  235   Thu Jul 25 09:13:36 2019 JonThings to BuyGeneralNeed to Order Gloves

New gloves are ordered for the TCS and QIL labs. They arrive tomorrow (Friday).

Quote:

Small/Medium size gloves need to be ordered in order to handle the optics carefully.

 

ELOG V3.1.3-