Taiwan VOPO item movement

I took the following:

Mirror mounts - one from scattering table, two from FC cleanroom

IR steering mirrors - one pack of 9 from the KFC spare parts box

Fiber PD power supply - To TAMA

It seems Newport's SW-OM adjustable spanner wrench may be more suited to getting rid of the TAMA OPO retaining ring. There wasn't any appropriate tool in the TAMA OPO spare parts box. Thorlabs sells SPW-908 that looks like the exact kind of thing to unscrew the retaining ring, but conveniently the unscrewing things are 1mm too far apart.

Prerpration for setting up blackout curtain

I will set up blackout curtain near the cryostat optical table to section off the back side of ATC lab (figure-1). The plan is to move the long Al bar closer to the AC unit and hang the curtain on the entire length of the rod (figure-2). I measured various dimensions for this work.

During this work, I noticed the items on the optical table were moved. If you move stuff on the table, an email or verbal confrimation would be appericated.

Taiwan VOPO test

Hsun-Chung, Chien-Ming, Michael

We took from TAMA the Qubig EOM box as well as a Sigma-type 30mm polarizer mount and a regular steering mirror mount. We also brought the VOPO equipment to the ATC cleanroom.

I also brought from FC cleanroom an adjustable-width key to try and unscrew the PZT spacer from the assembly (fig 6 of 3651) but the necessary force is ridiculously tight and I ended up just scratching the brass face again. I need to look for a better tool. Maybe this is why all serious squeezing experiments use the Advanced LIGO bowtie design instead.

OPO PZT replacement

Logan, Michael

We inspected the 0.5in incoupler mirror of the OPO cavity using a strong flashlight. I took very close up photos with my macro lens (fig 1). There is a lot of o-ring residue which is unavoidable. Also a bit of dust. Maybe won't hurt to put First Contact.

We took out the OPO PZT and inspected (fig 2, 3). The new one looks a bit cleaner (fig 4, 5). Maybe the electrode on the old one is burnt out? I don't really know but maybe should carefully confirm the polarity of the PZT before soldering.

When replacing the PZT the retaining ring was screwed in too far and was hard to unscrew with stuff in the ATC room (fig 6). I'm pretty sure there is a proper tool in TAMA. That said I also think this OPO spacer design is very bad.

Comment to OPO characterization in ATC - inventory (Click here to view original report: 3647)

Well,,, we need to clean up stuffs...

Sample measurement PCI

50L, 5/6 WITHOUT SCREWS STRAIN
average = 15    ;   waits time =10 000ms
air r = 3 ; sample r = 10
center x= 323.565; y= 154.375 ; z=60

 

azy=75

air= Wed, Jul 10, 2024 9-10-19 AM.txt

sample: Wed, Jul 10, 2024 9-18-28 AM.txt

azy=60

air=Wed, Jul 10, 2024 10-32-55 AM.txt

sample=Wed, Jul 10, 2024 10-42-45 AM.txt

azy=45

air = Wed, Jul 10, 2024 11-58-29 AM.txt

sample=Wed, Jul 10, 2024 12-36-48 PM.txt

azy=30

air=Wed, Jul 10, 2024 1-51-28 PM.txt

sample=Wed, Jul 10, 2024 1-58-31 PM.txt

azy=15

air=Wed, Jul 10, 2024 3-43-55 PM.txt

sample=Wed, Jul 10, 2024 3-52-17 PM.txt

azy=0

air = Wed, Jul 10, 2024 5-06-51 PM.txt

sample=Wed, Jul 10, 2024 5-25-48 PM.txt

Sample measurement

After creating different maps with averages of 15, 50, and 100, we are still encountering issues with the homogeneity of the Jones matrix. We suspect there may be problems with the LabVIEW code conducting measurements during the translation stage movement. Therefore, we are trying a new measurement approach by increasing the wait time.

50L, 5/6 WITHOUT SCREWS STRAIN
average = 15    ;   waits time =1000ms
air r = 3 ; sample r = 3
center x= 323.565; y= 154.375 ; z=60

azy= 0
air : Tue, Jul 9, 2024 6-37-07 PM.txt
sample : Tue, Jul 9, 2024 6-40-33 PM.txt

azy=15

air: Tue, Jul 9, 2024 6-43-29 PM.txt

sample : Tue, Jul 9, 2024 6-46-46 PM.txt

azy=30

air: Tue, Jul 9, 2024 6-49-47 PM.txt

sample: Tue, Jul 9, 2024 6-52-26 PM.txt

azy=45

air :Tue, Jul 9, 2024 6-55-41 PM.txt

sample :Tue, Jul 9, 2024 6-58-18 PM.txt

azy=60

air:Tue, Jul 9, 2024 7-01-33 PM.txt

sample:Tue, Jul 9, 2024 7-04-16 PM.txt

azy=75

air=Tue, Jul 9, 2024 7-08-22 PM.txt

sample =Tue, Jul 9, 2024 7-11-16 PM.txt

Sample measurement

50L, 5/6 WITHOUT SCREWS STRAIN
average = 100
air r = 3 ; sample r = 13
center x= 323.565; y= 154.375 ; z=60

 

azy=75

air=Mon, Jul 8, 2024 7-33-54 AM.txt

sample = Mon, Jul 8, 2024 7-44-50 AM.txt

azy=60:

air = Mon, Jul 8, 2024 10-52-11 AM.txt

sample = Mon, Jul 8, 2024 12-48-55 PM.txt

azy=45

air=Mon, Jul 8, 2024 3-55-57 PM.txt

sample : Mon, Jul 8, 2024 4-06-11 PM.txt

azy=30

air= Mon, Jul 8, 2024 8-01-26 PM.txt

sample : Mon, Jul 8, 2024 8-12-17 PM.txt

azy=15

air = Tue, Jul 9, 2024 7-10-43 AM.txt

sample :Tue, Jul 9, 2024 10-29-25 AM.txt

azy = 0

air = Tue, Jul 9, 2024 1-37-48 PM.txt

sample = Tue, Jul 9, 2024 1-48-34 PM.txt

OPO characterization in ATC - inventory

I took from general TAMA storage a couple of polarizer mounts (one Thorlabs an done Newport), as well as rail mounts and ND filters from the squeezing clean room. 

Last Friday I checked a bit the beam size based roughly on a recalculated version of the OPO MMT from Logan. While in principle we could design the beam to be a little bit too small (~20um) and then fine tune it upwards in size, in reality I was having trouble approaching the required 25 um radius. Somehow I seem to be having more trouble with this than I expected. Last time it "just worked" straight out of JamMT. Sometimes I see a very small beam on the sensor card but the detector tells me it is 0.5mm diameter as well.

I suspected a bit that we might be saturating the detector but according to the specs that doesn't seem to be the case (approximate intensity = 0.002 W /(pi*(0.020 mm)^2 = 1.6 W/mm^2 - max dynamic range 10W/mm^2, damage threshold 200 W/mm^2). Still, I brought stronger ND filtering to check anyway.

I disassembled the OPO input optics assembly and took out the input mirror. The PZT retaining rings seems slightly dusty. I tried to check with my weak phone light if the input mirror was dirty but I couldn't see anything. Like last time, there seems to be some residue from the O-ring where it is pressing against the input coupler clamp. I left the input mirror on top of some Alpha wipes with Akutsu-san's stuff but then saw that they were a bit dirty, there is even a mosquito on the cloth. Also I have some soldering gear (iron, heater) sitting outside the ATC cleanroom but I won't be available to finish the soldering job until Thursday unfortunately.

Measurement sample 50mm 5/6 ; effect of the strain on the birefringence

We get some issue with the analysis maybe due to the low averaging so I do the same with an more importante averaging.

50L, 5/6 WITHOUT SCREWS STRAIN
average = 50
air r = 3 ; sample r = 13
center x= 323.565; y= 154.375 ; z=60

azy= 0
air : Fri, Jul 5, 2024 12-06-42 PM.txt
sample : Fri, Jul 5, 2024 12-37-36 PM.txt

 

azy = 15

air : Fri, Jul 5, 2024 2-17-08 PM.txt

sample : Fri, Jul 5, 2024 2-22-40 PM.txt

azy=30

air = Sun, Jul 7, 2024 8-15-29 AM.txt

sample = Sun, Jul 7, 2024 8-21-47 AM.txt

azy=45

air=Sun, Jul 7, 2024 4-04-18 PM.txt

sample =Sun, Jul 7, 2024 4-10-02 PM.txt

azy = 60

air =  Sun, Jul 7, 2024 6-09-54 PM.txt

sample = Sun, Jul 7, 2024 6-16-48 PM.txt

azy=75

air = Sun, Jul 7, 2024 8-01-19 PM.txt

sample : Sun, Jul 7, 2024 8-07-07 PM.txt

Comment to AlgasAs measurement at different angle of incidence (Click here to view original report: 3632)

@ 169 deg

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Coating measurement\AlGaAs\20240701\169 deg\Fri, Jul 5, 2024 3-25-49 PM.txt

Comment to AlgasAs measurement at different angle of incidence (Click here to view original report: 3632)

@ 167 deg

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Coating measurement\AlGaAs\20240701\167 deg\Fri, Jul 5, 2024 1-23-23 PM.txt

Comment to Measurement sample 50mm 5/6 ; effect of the strain on the birefringence (Click here to view original report: 3637)

error last raw replace by : "sample : Fri, Jul 5, 2024 9-10-47 AM.txt"

Comment to AlgasAs measurement at different angle of incidence (Click here to view original report: 3632)

further measurements that were done 

@ 200 deg

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Coating measurement\AlGaAs\20240701\200 deg\Wed, Jul 3, 2024 1-17-01 PM.txt

@ 210 deg

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Coating measurement\AlGaAs\20240701\210 deg\Wed, Jul 3, 2024 5-54-22 PM.txt

Measurement sample 50mm 5/6 ; effect of the strain on the birefringence

50L, 5/6

average = 15
air r = 3 ; sample r = 13
center x= 323.565; y= 154.375 ; z=60
azy=0
air : Wed, Jul 3, 2024 2-04-01 PM.txt
sample : Wed, Jul 3, 2024 2-06-34 PM.txt

azy =15
air : Wed, Jul 3, 2024 2-51-23 PM.txt
sample : Wed, Jul 3, 2024 2-53-52 PM.txt

azy =30
air : Wed, Jul 3, 2024 3-31-49 PM.txt
sample : Wed, Jul 3, 2024 3-34-19 PM.txt

azy=45
air : Thu, Jul 4, 2024 8-47-25 AM.txt
sample :Thu, Jul 4, 2024 8-58-18 AM.txt

azy =60
air= Thu, Jul 4, 2024 9-38-32 AM.txt
sample=Thu, Jul 4, 2024 9-41-45 AM.txt

azy=75 air= Thu, Jul 4, 2024 10-25-24 AM.txt
sample=Thu, Jul 4, 2024 10-27-51 AM.txt

azy=90
air= Thu, Jul 4, 2024 11-41-35 AM.txt
sample= Thu, Jul 4, 2024 11-44-40 AM.txt

After this measurement we saw that the birefringence of this sample seems follow a very singular pattern. We suppose that this pattern can be induce by the strain of the screws use to fix the sample. So we decide to remove this screw and mad the same measurement with the same sample but without his two screw. The result is on the following measurement.

50L, 5/6 WITHOUT SCREWS STRAIN
average = 15
air r = 3 ; sample r = 13
center x= 323.565; y= 154.375 ; z=60
azy = 90
air: Thu, Jul 4, 2024 1-57-18 PM.txt
sample:Thu, Jul 4, 2024 2-00-03 PM.txt

azy=0 air = Thu, Jul 4, 2024 4-39-39 PM.txt
sample = Thu, Jul 4, 2024 4-42-12 PM.txt

azy=15 air=Thu, Jul 4, 2024 5-37-47 PM.txt
sample=Thu, Jul 4, 2024 5-40-16 PM

azy=30 air= Thu, Jul 4, 2024 6-39-02 PM.txt
sample:Thu, Jul 4, 2024 6-41-54 PM.txt

azy=45 air = Fri, Jul 5, 2024 7-44-42 AM.txt
sample = Fri, Jul 5, 2024 7-48-36 AM.txt

azy=60
air : Fri, Jul 5, 2024 8-25-22 AM.txt
sample :Fri, Jul 5, 2024 8-30-02 AM.txt

azy = 75
air : Fri, Jul 5, 2024 9-07-23 AM.txt
sample : Fri, Jul 5, 2024 9-07-23 AM.txt

Measurement sample, 50mm, 6/6

50L, 6/6
average = 15
air r = 3 ; sample r = 13
center x= 323.565; y= 154.375 ; z=60

0 deg without sample : Wed, Jul 3, 2024 7-05-19 AM
0 deg sample : Tue, Jul 2, 2024 5-13-54 PM

15 deg without sample : Wed, Jul 3, 2024 7-05-19 AM
15 deg sample : Wed, Jul 3, 2024 7-08-21 AM

30 deg without sample : Wed, Jul 3, 2024 7-46-08 AM
30 deg sample : Wed, Jul 3, 2024 7-48-54 AM

45 deg without sample : Wed, Jul 3, 2024 8-45-36 AM
45 deg sample : Wed, Jul 3, 2024 8-48-33 AM.txt

60 deg without sample : Wed, Jul 3, 2024 9-48-17 AM.txt
60 deg with sample :Wed, Jul 3, 2024 9-51-40 AM.txt

75 deg without sample : Wed, Jul 3, 2024 10-38-48 AM.txt
75 deg with sample : Wed, Jul 3, 2024 10-43-11 AM.txt

90 deg without sample : Wed, Jul 3, 2024 11-23-26 AM.txt
90 deg with sample : Wed, Jul 3, 2024 11-26-16 AM.txt

NB: data refound after the crash of logbook normally there is no probleme but if something seems wrong try to replace "0 deg sample : Tue, Jul 2, 2024 5-13-54 PM" by "0 deg sample : Tue, Jul 2, 2024 6-13-32 PM"

Test post

test

AlgasAs measurement at different angle of incidence

We measure by rotating the stage such that the reflected beam doesn't go through the BS. LC voltage scan is done from 0-3.5V with 0.1V step.

Normal incidence is at 172deg

Measurement @ 180 deg

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Coating measurement\AlGaAs\20240701\180 deg\Tue, Jul 2, 2024 11-44-16 AM.txt

Measurement @ 190 deg

C:\Users\atama\Dropbox\LC-Experiment\Measurement Data\Coating measurement\AlGaAs\20240701\190 deg\Tue, Jul 2, 2024 3-39-54 PM.txt

Comment to ILM sample measurement (Click here to view original report: 3627)

Of course "with QWP" need to e replace by "with ILM sample"

Measure PCI sample 3 cm

We find the center of the sample at : X = 323.565 ; Y = 154.375 2 different measure with different input polarization : -"Mon Jun 10 2024 4-21-27 PM" : ele =0° ; azy = 89.85° -"Mon Jun 10 2024 5-36-33 PM.txt" : ele = 0° ; azy = 45° (step = 1mm ; map radius = 15mm)