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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Category Subject Text Attachments
  523   Fri Apr 14 16:36:29 2023 ThejasOpticsCharacterizationDetermining the curvature bottom of the curved mirrorsAttached here with are relevant plots.

  522   Fri Apr 14 15:52:53 2023 Camille MakaremOpticsCharacterizationDetermining the curvature bottom of the curved mirrors[Camille, Thejas]

We repeated Zygo measurements (using
the same setup and method as below) for curved
  521   Thu Apr 13 07:47:28 2023 Camille MakaremOpticsCharacterizationZygo setup for curved mirror measurements[Camille, Thejas, Stephen]

We modified the Zygo setup for
measuring the sagitta of the curved mirrors.
  520   Tue Apr 11 16:18:25 2023 ThejasOpticsCharacterizationA+ OMC Curved mirror radius of curvatureCurved mirror radius of curvature raw data
can be found in the DCC document: T2300050

The input beam falling on the curved
  519   Wed Apr 5 22:09:30 2023 KojiFacilityGeneralHEPA Enclosure extensionChub finished the HEPA enclosure extension
  518   Tue Apr 4 16:14:06 2023 KojiOpticsLoan / LendingC7 mirror to DownsI handed Camille the C7 mirror for the
cross-calibration of the ROC characterization
  517   Mon Apr 3 11:06:47 2023 Thejas OpticsCharacterizationFlat mirror flatnessData can be found in DCC document T2300050. 


On Friday. Camille and I measured
  516   Tue Mar 28 11:21:27 2023 Camille MakaremOpticsCharacterizationSagitta measurements of curved mirrors[Camille, Stephen, Thejas]

Curved mirror sn02 was used to test
  515   Fri Mar 24 07:47:37 2023 Camille MakaremOpticsCharacterizationROC measurements of the curved mirrors[Camille]
22 March 2023
Beam profile measurements were continued
  514   Fri Mar 24 07:38:54 2023 Camille MakaremOpticsCharacterizationROC measurements of the curved mirrors[Thejas, Camille]
21 March 2023

We made slight adjustments to the
  513   Fri Mar 17 15:01:21 2023 Koji OpticsCharacterizationA+ OMC Curved mirror radius of curvatureThanks Koji, the lenses available in the
cabinet in the lab actually sufficed. 

  512   Wed Mar 15 17:07:35 2023 Koji OpticsCharacterizationA+ OMC Curved mirror radius of curvatureI hope you can find useful lenses from
the lens kit in the cabinet. If you need
more lenses and mounts, talk to our students
  511   Wed Mar 15 15:28:24 2023 Thejas OpticsCharacterizationA+ OMC Curved mirror radius of curvatureThanks for teh comment Koji. Yes, I did
see this effect by comparing the beam sizes
with and without the curved mirror. But the
  510   Tue Mar 14 20:06:03 2023 Koji OpticsCharacterizationA+ OMC Curved mirror radius of curvatureIf the mirror has the RoC, it works as
a lens. And you should be able to see the
effect in the beam profile.
  509   Tue Mar 14 18:24:03 2023 Thejas OpticsCharacterizationA+ OMC Curved mirror radius of curvatureToday, I tried to measure the radius of
curvature of the curved mirror using the
input beam for the OMC test set-up. It was
  508   Tue Mar 14 12:12:41 2023 Koji OpticsCharacterizationA+ OMC curved mirror characterizationRoC: 2.65m ! Interesting. I'll wait
for the follow-up analysis/measurements.
The RoC may be dependent on the area (diameter)
  507   Tue Mar 14 10:41:06 2023 Thejas OpticsCharacterizationA+ OMC curved mirror characterization[Camille, GarriLynn, Stephen, Thejas]

Folllowing the replacement of the
spherical transmission / reference mirror
  506   Fri Mar 10 11:12:57 2023 Thejas OpticsCharacterizationA+ OMC Curvature minimum of curved optics [GariLynn, Stephen, Thejas]

Yesterday, we placed an iris (borrowed
from OMC Lab) infront of the spherical transmission
  505   Fri Mar 10 10:23:08 2023 ThejasOpticsCharacterizationA+ OMC curved mirror radius of curvature OMC test set-up

Yesterday, laser beam output from
the fibre follwoing teh mode-matching lenses
  504   Wed Mar 8 17:27:51 2023 Thejas OpticsCharacterizationA+ OMC Curvature minimum of curved optics [Stephen, Thejas]

Today, a more rigorous effort was
made to re-measure the position of the optics
  503   Tue Mar 7 23:00:16 2023 Thejas OpticsCharacterizationOMC Lab clean upToday, Koji and I cleaned up the the lab
space and made some space on the
optical table for radius of curvature measurement
  502   Tue Mar 7 10:20:55 2023 Thejas OpticsCharacterizationA+ OMC Curved mirror radius of curvature[Camille, Stephen, Thejas]

Stephen returned the curved mirror
#6 to Liyuan for point transmission measurement.
  501   Mon Mar 6 16:02:56 2023 Thejas OpticsGeneralOMC test setup locking On Feb 16, Camille and I attampted at locking
the OMC cavity. It was quick to re-align
the beam to the cavity (by using only the
  500   Mon Mar 6 12:25:08 2023 KojiFacilityGeneralHEPA Enclosure improvementChub, JC, and co worked on the HEPA enclosure
  499   Wed Mar 1 10:23:10 2023 Thejas OpticsCharacterizationA+ OMC curved mirror characterization[Camille, Thejas, Stephen]

Yesterday, efforts were made to
measure ROC of curved mirrors (#6) in the
  498   Mon Feb 27 17:40:27 2023 Thejas OpticsCharacterizationA+ OMC curved mirror characterization[Camille, Stephen, Thejas]

Today, before the ZYGO lab was
cleaned and prepared for the cureved mirrors'
  497   Fri Feb 17 17:41:57 2023 Thejas ElectronicsCharacterizationA+ OMC Piezos wedge angle [Camille, Stephen, Thejas]

PZT model: Noliac 2124

Qty: 18 (Sr. No. 30 - 48)
  496   Fri Feb 17 17:25:39 2023 Thejas OpticsCharacterizationA+ OMC Breadboard measuerementsYesterday we also measured weight and dimensions
of breadboard. Error for the following measurements
is same as the least count of the instruments
  495   Fri Feb 17 17:11:28 2023 Thejas OpticsCharacterizationA+ OMC beam-splitter prisms wedge angle measurement [Camille, Stephen, Thejas]


Yesterday we measured wedge angle
  494   Wed Feb 15 17:40:21 2023 Thejas OpticsCharacterizationA+ OMC perpendicularity of hole prisms[Camille, Stephen, Thejas]

Contnuing the efforts to measure
and check perpendicularity: tombstone prisms
  493   Wed Feb 15 16:00:46 2023 StephenElectronicsGeneralOMC cables #4 inspectedInspection

Updated ICS (Shipment-12578) and
moved those parts to Storage-9482.
  492   Tue Feb 14 22:52:35 2023 Thejas OpticsCharacterizationA+ OMC Prism perpendicularity of HR Prisms and BS[Camille, Stephen, Thejas]

Continuing with the efforts to
measure the perpndicularity.
  491   Tue Feb 14 10:45:00 2023 Thejas OpticsCharacterizationA+ OMC Prism perpendicularity[Camille, Stephen, Thejas]

Following the wedge angle measurements
of the prisms, perpendicularoty of their
  490   Thu Feb 9 15:54:41 2023 Thejas OpticsCharacterizationA+ OMC, Parallelism of HR Prisms [Camille, Thejas, Stephen]

Continuing yesterday's efforts
to measure the wedge angle of the back surface
  489   Wed Feb 8 16:10:52 2023 StephenOpticsCharacterizationA+ OMC, Parallelism of HR Prisms[Camille, Thejas, Stephen]

We set up the white light autocollimator
in the Downs B119 cleanroom. (Nippon Kogaku,
  487   Sat Feb 4 03:33:22 2023 KojiGeneralGeneralOMC Lab InventoryAttachment 1: North Cabinet 2nd from the

Attachment 2: North Cabinet 3rd
  486   Sat Feb 4 03:30:02 2023 KojiElectronicsGeneralOMC cables #4 arrived The OMC cables #4 arrived on Feb 3rd. (See

This shipment included two DCPD
  485   Sat Feb 4 03:22:46 2023 KojiFacilityGeneralReady for the HEPA enclosure expansionHEPA is quite low for a tall person and
also the curtain on the back of us is always
heavy. It's very tough for anyone to
  484   Sat Feb 4 03:16:10 2023 KojiOpticsGeneralOMC #4: One Invar block bonded with tiltThe attached photo shows the resulting
bond spread.

  483   Thu Feb 2 03:09:41 2023 KojiOpticsGeneralOMC #4: One Invar block bonded with tilt[Camille, Thejas, Koji]

We added a reinforcement bar at
the back of the invar block which had the
  482   Wed Feb 1 01:44:14 2023 KojiGeneralGeneralOMC (004) plan2/1 2:30PM~ Bonding reinforcement (Last
EP30-2 gluing)

2/2 1:00PM~ Peripheral attachment
  481   Wed Feb 1 01:39:41 2023 KojiMechanicsGeneralDCPD housing / QPD housingInserted 4-40 and 2-56 helicoils into the
DCPD/QPD housings for the 4th OMC. The retainer
caps were also fastened to the housings.
  480   Wed Feb 1 01:33:03 2023 KojiMechanicsGeneral5th OMC Transport FixtureThe transport fixture was brought to the
40m clean room to use as an assembly reference.
  479   Sat Jan 28 00:46:21 2023 KojiMechanicsGeneralOMC #4: Replaced the locks of the transport fixture Yesterday, we noticed that we could not
close the transport fixture for OMC #4. We
could not fully rotate the knobs of the locks.
  478   Sat Jan 28 00:38:56 2023 KojiMechanicsGeneralOMC #1 cable bracket replacement / OMC #1 repair completedThe AL metal bracket was replaced with
a PEEK version.

Attachments 1/2: Before the replacement.
  477   Thu Jan 26 23:46:13 2023 KojiOpticsGeneralOMC #1 input beam dump bondingA beam dump was stacked on the base of
the previous beam dump. The angle was determined
so that the main transmission goes through
  476   Thu Jan 26 23:16:35 2023 KojiOpticsConfigurationOMC #4: Top side bonding.[Camille, Koji]
  475   Thu Jan 26 23:07:14 2023 KojiOpticsGeneralOMC #4: Input beam dump bonding[Camille, Koji]

During the second UV epoxy session,
we did not bond the input beam dump. This
  474   Thu Jan 26 22:57:19 2023 KojiOpticsGeneralOMC #4: One Invar block bonded with tilt[Camille, Koji]

The bottom side template was separated
into two pieces and successfully removed
  473   Wed Jan 25 23:51:04 2023 KojiGeneralGeneralThe items packed for DownsQty1 1/2 mounts
Qty2 prism mounts
Qty6 gluing fixures
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