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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)

OPO characterization in ATC - mode matching

Logan, Michael

We proceeded with trying to get the mode matching to the OPO. We have, as last time, a mode matching telescope consisting of f = 40mm and f = 75mm lenses which are mounted on millimeter rails. We saw that the height of the center of these lenses was 75mm and 77 mm. 

When we tried to do the mode matching previously we set the beam profiler at the nominal OPO waist position and then iteratively adjusted the lenses around their design positions in the same manner as the steering mirror beam walking alignment method. However, the beam profile was quite asymmetric at times. Somehow, last time we did this OPO test, we managed to get a quite good beam profile coming out of this mode matching telescope design (25.5 vs 26 um), despite the beam coming from the preset beam path (Lightwave Laser + lenses) being quite astigmatic (135 vs 160 um). However, in that case we had one steering mirror between the lenses at 45 degree incidence. We saw that the beam, which we had previously set to travel "approximately" along a set of screw holes at about 73mm height, was entering the first lens low and to the right, causing a large deflection to hit the second lens up and to the left. This might cause some difference in horizontal versus vertical focusing and also deflects the beam going into the beam profiler, making adjustment a bit annoying.

We decided to more precisely center the beam going to the mode matching telescope. Before, we set up this beam path by diverting the s-pol beam going to the Korean Faraday isolator. We replaced that mirror with a BSW11 50:50 beamsplitter then set up two steering mirrors at 45 degree incidence to more accurately set the beam path along a set of screw holes, this time at 75mm height. The beam was aligned iteratively along the path using the two steering mirrors and close/far targets. We also took a proper spacer to make the second lens at 75mm height. So now we have an adjustable beam going to our OPO MMT, as well as incidenct s-pol light on the Korean FI.

We took a steering mirror from the Taiwan SHG p-pol path. Since I will change the input coupler to one with a 1.53 mm diameter input beam (vs 4.5 mm clear aperture to meet the CA = 2.7D -> 1 ppm diffraction requirement), we are going to mess up this path either way. We were running out of mirrors so I took two Optosigma TVFM-25C05-1064 steering mirrors from the KFC box.

We also labelled some unlabelled optics on the table.

cc pll investigation

[Logan, Marc]

we started by replacing the PD battery by a spare one.

Then, by tuning the mode-matching of each fiber.

after some tweaking we have CC input 0.49mW and transmission 0.144mW and ML input 4.06mW and transmission 0.69 mW.

The ML transmission was highly fluctuating (maybe du to ceiling light?).

We could also recover the lock but as seen from the muxout 'digital lock detect'it is not stable at all...

p-pol pll recovery

[Logan, Marc]

We started with some issues to see the beatnote signal that was fluctuating and disappearing randomly. Some monitoring cables were cutting the main laser beam and this issue was resolved after moving them.

We recovered about 20% mode-matching for each beam.

We  could not change the DDS3 DAC1 frequency. What is surprising is that it can change when reloading a new config but not when just loading new frequency in an existing frequency.

We moved p-pol pll lo to DAC0 that is working properly.

To achive the lock, we had to change the phase detector polarity to negative as saved in the latest config file

Mounting AlGaAs on rotating stage

[Shalika, Marc, Hugo]

We have mounted the mirror on rotational stage to study the birefringence dependence on angle of incidence. The angle of rotator at normal incidence is 172 deg. The camera is mounted as well on this rotator stage, such that it can be placed radially infront of the coating.