Neolase amplifier installation, posted by Ronic Chiche at Optical room about mechanics | lasers and optics | cabling
|
now, I installed the long pipes (2x 3m) in closed loop (without the amplifier connected), but the exact ones used to connect the laser, with the same pipe adapters.
after the compression process, the chiller works at 0.9 bar and the measured flow is 4.7Lpm.
so, it's still OK !
after a long time, I observed a small leakage on the "male" adapter on the amplifier side.
| Ronic Chiche wrote: |
|
I drained the chiller to install again the short pipe (< 1m) in closed loop.
then, I filled again the chiller and did the compression process to obtain 1bar.
in that case, the flow measured by the chiller is correct about 5.8Lpm.
PS : the correct length for the previous calculation is 6m (2x 3m) and not 3m...
in that case, the flow should be ~ 15Lpm (and not 22 Lpm)
| )Ronic Chiche wrote: |
|
pipes are maybe too long ?
we can use the Darcy-Weisbach + Blasius laws (non linear laws).
I asked to ChatGPT, Claude, Mistral and MathGPT to solve it with these parameters :
L ~ 3m
D = 1 cm
water at 20°C
dP = 0.7 bar
they all found ~ 22-23L/min
so, the tube length should not be the problem... to be investiguated.
| Ronic Chiche wrote: |
|
now, I connected the chiller circuit to the amplifier, thanks to the adapters.
chiller IN => blue pipe => laser OUT
chiller OUT => black pipe => laser IN
after several filling and compression procedure, the flow is only 1.7Lpm and the pressure is 0.8 bar.
the temperature has been set to 20°C according to the manual operating range 18-23°C.
the flow is too low !
according to the manual, the flow should be 3-5Lpm !
a very small leakage appears if the mechanical constrains on the pipe is too high.
so, I separated the IN and OUT pipes to release this constrain and fixed the pipes to keep the position.
| Ronic Chiche wrote: |
|
we have all the adaptor plugs for connecting the chiller.
so, I tested first the chiller connected in closed loop (on itself).
there is no manual, so procedure is not completely clear...
DO NOT PLUG ANYTHING BEFORE THE CHILLER ASK FOR IT
ONE MUST FOLLOW THE PROCEDURE ON THE CHILLER DISPLAY
1) if the chiller circuit is full of coolant liquid,
one must start by a System Startup -> Draining
(a trash tank and the hose will be need for emptying the circuit)
2) once the chiller circuit is empty
one must continue by System Startup -> Filling
(a clean demineralized water tank and the hose will be need for filling the circuit)
=> OK !
the chiller is able the fill and drain its circuit.
I saw the cooling water circulating in the closed loop.
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Neolase amplifier installation, posted by Ronic Chiche at Optical room about mechanics | lasers and optics | cabling
|
I cut a small part of the black pipe on the amplifier side (could it be slightly deformed by a try with an other type of adapter ?), with the dedicated tool, changed the adapter and plugged it more firmly in the pipe (pipe deeply inserted in the adapter).
it seems, there is no more leakage.
measured pressure and flow are 0.9 bar and 4.7Lpm => OK without amplifier.
| Ronic Chiche wrote: |
|
now, I installed the long pipes (2x 3m) in closed loop (without the amplifier connected), but the exact ones used to connect the laser, with the same pipe adapters.
after the compression process, the chiller works at 0.9 bar and the measured flow is 4.7Lpm.
so, it's still OK !
after a long time, I observed a small leakage on the "male" adapter on the amplifier side.
| Ronic Chiche wrote: |
|
I drained the chiller to install again the short pipe (< 1m) in closed loop.
then, I filled again the chiller and did the compression process to obtain 1bar.
in that case, the flow measured by the chiller is correct about 5.8Lpm.
PS : the correct length for the previous calculation is 6m (2x 3m) and not 3m...
in that case, the flow should be ~ 15Lpm (and not 22 Lpm)
| )Ronic Chiche wrote: |
|
pipes are maybe too long ?
we can use the Darcy-Weisbach + Blasius laws (non linear laws).
I asked to ChatGPT, Claude, Mistral and MathGPT to solve it with these parameters :
L ~ 3m
D = 1 cm
water at 20°C
dP = 0.7 bar
they all found ~ 22-23L/min
so, the tube length should not be the problem... to be investiguated.
| Ronic Chiche wrote: |
|
now, I connected the chiller circuit to the amplifier, thanks to the adapters.
chiller IN => blue pipe => laser OUT
chiller OUT => black pipe => laser IN
after several filling and compression procedure, the flow is only 1.7Lpm and the pressure is 0.8 bar.
the temperature has been set to 20°C according to the manual operating range 18-23°C.
the flow is too low !
according to the manual, the flow should be 3-5Lpm !
a very small leakage appears if the mechanical constrains on the pipe is too high.
so, I separated the IN and OUT pipes to release this constrain and fixed the pipes to keep the position.
| Ronic Chiche wrote: |
|
we have all the adaptor plugs for connecting the chiller.
so, I tested first the chiller connected in closed loop (on itself).
there is no manual, so procedure is not completely clear...
DO NOT PLUG ANYTHING BEFORE THE CHILLER ASK FOR IT
ONE MUST FOLLOW THE PROCEDURE ON THE CHILLER DISPLAY
1) if the chiller circuit is full of coolant liquid,
one must start by a System Startup -> Draining
(a trash tank and the hose will be need for emptying the circuit)
2) once the chiller circuit is empty
one must continue by System Startup -> Filling
(a clean demineralized water tank and the hose will be need for filling the circuit)
=> OK !
the chiller is able the fill and drain its circuit.
I saw the cooling water circulating in the closed loop.
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Neolase amplifier installation, posted by Ronic Chiche at Optical room about mechanics | lasers and optics | cabling
|
as soon as I connect the amplifier to the pipes, the flow decreases to 1.7Lpm.
and the filling process is very long and noisy, as there was something blocking the filling process...
| Ronic Chiche wrote: |
|
I cut a small part of the black pipe on the amplifier side (could it be slightly deformed by a try with an other type of adapter ?), with the dedicated tool, changed the adapter and plugged it more firmly in the pipe (pipe deeply inserted in the adapter).
it seems, there is no more leakage.
measured pressure and flow are 0.9 bar and 4.7Lpm => OK without amplifier.
| Ronic Chiche wrote: |
|
now, I installed the long pipes (2x 3m) in closed loop (without the amplifier connected), but the exact ones used to connect the laser, with the same pipe adapters.
after the compression process, the chiller works at 0.9 bar and the measured flow is 4.7Lpm.
so, it's still OK !
after a long time, I observed a small leakage on the "male" adapter on the amplifier side.
| Ronic Chiche wrote: |
|
I drained the chiller to install again the short pipe (< 1m) in closed loop.
then, I filled again the chiller and did the compression process to obtain 1bar.
in that case, the flow measured by the chiller is correct about 5.8Lpm.
PS : the correct length for the previous calculation is 6m (2x 3m) and not 3m...
in that case, the flow should be ~ 15Lpm (and not 22 Lpm)
| )Ronic Chiche wrote: |
|
pipes are maybe too long ?
we can use the Darcy-Weisbach + Blasius laws (non linear laws).
I asked to ChatGPT, Claude, Mistral and MathGPT to solve it with these parameters :
L ~ 3m
D = 1 cm
water at 20°C
dP = 0.7 bar
they all found ~ 22-23L/min
so, the tube length should not be the problem... to be investiguated.
| Ronic Chiche wrote: |
|
now, I connected the chiller circuit to the amplifier, thanks to the adapters.
chiller IN => blue pipe => laser OUT
chiller OUT => black pipe => laser IN
after several filling and compression procedure, the flow is only 1.7Lpm and the pressure is 0.8 bar.
the temperature has been set to 20°C according to the manual operating range 18-23°C.
the flow is too low !
according to the manual, the flow should be 3-5Lpm !
a very small leakage appears if the mechanical constrains on the pipe is too high.
so, I separated the IN and OUT pipes to release this constrain and fixed the pipes to keep the position.
| Ronic Chiche wrote: |
|
we have all the adaptor plugs for connecting the chiller.
so, I tested first the chiller connected in closed loop (on itself).
there is no manual, so procedure is not completely clear...
DO NOT PLUG ANYTHING BEFORE THE CHILLER ASK FOR IT
ONE MUST FOLLOW THE PROCEDURE ON THE CHILLER DISPLAY
1) if the chiller circuit is full of coolant liquid,
one must start by a System Startup -> Draining
(a trash tank and the hose will be need for emptying the circuit)
2) once the chiller circuit is empty
one must continue by System Startup -> Filling
(a clean demineralized water tank and the hose will be need for filling the circuit)
=> OK !
the chiller is able the fill and drain its circuit.
I saw the cooling water circulating in the closed loop.
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Motors for D-shaped mirrors, posted by Loïc Amoudry at Optical room about mechanics | lasers and optics 
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Motors have been installed on 16/10/18. No problem with them.
Effect of the motors tested on 17/10/18. No improvement. But they give the possibility to perfectly cut HOM or let them go through as show the following picture of a 2.2 mode at ~340 mW in trans and 70% coupling @4A. |
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Power measurement with D-shape, posted by Loïc Amoudry at Optical room about mechanics | lasers and optics
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Measurements of lot of points with D-shape mirrors well positionned.
Power not optimized to the best but almost. (@4A could have 350 mW).
| I (A) |
Ptrans (mW) |
Coupling (%) |
|
0
|
8 |
62 |
| 1 |
18 |
67 |
| 1.3 |
43 |
72 |
| 1.6 |
76 |
72 |
| 1.9 |
112 |
72 |
| 2.2 |
145 |
72 |
| 2.5 |
177 |
72 |
| 2.8 |
217 |
72 |
| 3.1 |
253 |
72 |
| 3.4 |
281 |
72 |
| 3.7 |
300 |
72 |
| 4 |
323 |
71 |
| 4.3 |
249 |
71 |
| 4.6 |
379 |
68 |
| 4.9 |
402 |
68 |
| 5.2 |
417 |
67 |
| 5.5 |
435 |
67 |
| 5.8 |
441 |
65 |
|
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Alignment of a 2-mirror FP cavity, posted by Ronic Chiche at Optical room about mechanics | lasers and optics
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today with Alice,
- we measured the height of the SBOX windows center : 140mm from the optical table.
- we set the laser fiber colimator exactly at this height.
- we placed 2 mirrors to align the future telescope path at exactly 140mm height along the whole possible travel of the lenses in order to keep them aligned.
the horizontal position is also aligned on this path and a ruler has been placed along this path to help to move the future telescope lenses without misalignment.
- we aligned 2 iris on this path to keep this path axis in case of misalignment.
- we placed 2 iris at the center of the input and output FP-cavity windows.
- we precisely aligned the laser beam on these iris.
in the next days, we need to align the mounts in the SBOX and align also the 2 FP-cavity mirrors.
the output mirror will be a "bad" ThomX 2.24m ROC ULE mirror and the input mirror will be a plan 460ppm Gamma Factory mirror. |
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2-mirror cavity alignment, posted by Alice Renaux at Optical room about mechanics | lasers and optics
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At the beginning of the week, I installed a half-wave plate, a beamsplitter cube and a quarter-wave plate, as well as the end-of-cavity mirror, which I unsuccessfully tried to align.
I removed the end-of-cavity mirror and started the laser injection over again with the two motorized mirrors placed in front of the vacuum chamber (but left Ronic's setup as it was).
Today, I aligned the laser by putting an iris on the cavity mirrors' mounts. I tested the repeatability of such a setup, both by removing and putting back the same iris and by using a different iris. The result is in the attached pictures. Is it good enough ?
The mirrors' motors positions are :
- 1 : 3.349670 mm ;
- 3 : 2.060280 mm ;
- 4 : 3.484560 mm ;
- 5 : 3.269710 mm.
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SBox Finesse at 216.6625 MHz, posted by Manar Amer at Optical room about lasers and optics | vacuum
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The Sbox currently has the injection from ThomX installed T ~ 120 ppm , M2 planar from Sbox spare and M3 / M4 spherical mirrors from Sbox installed.
The last finesse measurement that was done gave a Finesse of ~ 19300 (After cleaning M2 using ethanol + aceton + pure water)
on Friday the whole optical table was cleaned again and the inside of the box was cleaned (even with a lot of dust inside the box the Finesse was 19300 )
all the mirrors were cleaned after using the three steps, M3 and M4 had clear visible dust on them.
D-shaped mirrors were installed again between M1 and M2
The alignment was redone and the beating observed , There is still a need for alignment improvement.
the cavity is under vacuum ~ 4.8*10^-2 mbar on Friday evening (~ 19h00) , The cavity is yet to be locked and to measure its Finesse
A PowerPoint showing the last finesse measurement and the error signal of the menhir laser lock
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SBox Finesse at 216.6625 MHz, posted by Manar Amer at Optical room about lasers and optics | vacuum
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Max Finesse obtained @ 4 mirror setup was ~ 19 300
With M1 from ThomX , M2/M3/M4 from SBox
| Manar Amer wrote: |
|
The Sbox currently has the injection from ThomX installed T ~ 120 ppm , M2 planar from Sbox spare and M3 / M4 spherical mirrors from Sbox installed.
The last finesse measurement that was done gave a Finesse of ~ 19300 (After cleaning M2 using ethanol + aceton + pure water)
on Friday the whole optical table was cleaned again and the inside of the box was cleaned (even with a lot of dust inside the box the Finesse was 19300 )
all the mirrors were cleaned after using the three steps, M3 and M4 had clear visible dust on them.
D-shaped mirrors were installed again between M1 and M2
The alignment was redone and the beating observed , There is still a need for alignment improvement.
the cavity is under vacuum ~ 4.8*10^-2 mbar on Friday evening (~ 19h00) , The cavity is yet to be locked and to measure its Finesse
A PowerPoint showing the last finesse measurement and the error signal of the menhir laser lock
|
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SBox Finesse at 216.6625 MHz, posted by Manar Amer at Optical room about lasers and optics | vacuum
|
| Manar Amer wrote: |
|
Max Finesse obtained @ 4 mirror setup was ~ 19 300
With M1 from ThomX , M2/M3/M4 from SBox
| Manar Amer wrote: |
|
The Sbox currently has the injection from ThomX installed T ~ 120 ppm , M2 planar from Sbox spare and M3 / M4 spherical mirrors from Sbox installed.
The last finesse measurement that was done gave a Finesse of ~ 19300 (After cleaning M2 using ethanol + aceton + pure water)
on Friday the whole optical table was cleaned again and the inside of the box was cleaned (even with a lot of dust inside the box the Finesse was 19300 )
all the mirrors were cleaned after using the three steps, M3 and M4 had clear visible dust on them.
D-shaped mirrors were installed again between M1 and M2
The alignment was redone and the beating observed , There is still a need for alignment improvement.
the cavity is under vacuum ~ 4.8*10^-2 mbar on Friday evening (~ 19h00) , The cavity is yet to be locked and to measure its Finesse
A PowerPoint showing the last finesse measurement and the error signal of the menhir laser lock
|
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
|
Used the spincoater and pure water to clean dielectric mirrors which will be installed inside the SBox for directing the reflection line.
The method : place pure alchole on mirror - wipe it using white sterile tissue (in one direction) - clean with pure water in spincoater suing cotton swap .
After multible rounds, the result in the images was obtained. there is still a significant amount of dust particles (not all could be dust!!).
Not sure if the reason is the cleaning method ?? will invistegate it more !!!
| Manar Amer wrote: |
|
In preparation for cleaning the mirrors.
The spincoater has been moved with its bump into the sas of the SBox.
The pure water used will be provided by Alice, as the previous source in the workshop is not available.
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
|
Images of the SBox mirrors cleaned at the same time when the cavity was aligned.
Directly from the spincoater to the SBox directly.
PowerPoint attached shows details
| Manar Amer wrote: |
|
Used the spincoater and pure water to clean dielectric mirrors which will be installed inside the SBox for directing the reflection line.
The method : place pure alchole on mirror - wipe it using white sterile tissue (in one direction) - clean with pure water in spincoater suing cotton swap .
After multible rounds, the result in the images was obtained. there is still a significant amount of dust particles (not all could be dust!!).
Not sure if the reason is the cleaning method ?? will invistegate it more !!!
| Manar Amer wrote: |
|
In preparation for cleaning the mirrors.
The spincoater has been moved with its bump into the sas of the SBox.
The pure water used will be provided by Alice, as the previous source in the workshop is not available.
|
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
|
PowerPoint shows the detailed images of all the mirrors before and after cleaning.
Images of SBox mirrors and M1 from Gamma factory attached only for the front after cleaning
the lines showing are on the back of the mirrors, they come from the spinning mount the mirrors are fixed on in the spin-coater.
Naming code :
M#BB - M# mirror Back Before cleaning
M#BA - M# mirror Back After cleaning
M#FB - M# mirror Front Before cleaning
M#FA - M# mirror Front After cleaning
G : Gamma factory
| Manar Amer wrote: |
|
Images of the SBox mirrors cleaned at the same time when the cavity was aligned.
Directly from the spincoater to the SBox directly.
PowerPoint attached shows details
| Manar Amer wrote: |
|
Used the spincoater and pure water to clean dielectric mirrors which will be installed inside the SBox for directing the reflection line.
The method : place pure alchole on mirror - wipe it using white sterile tissue (in one direction) - clean with pure water in spincoater suing cotton swap .
After multible rounds, the result in the images was obtained. there is still a significant amount of dust particles (not all could be dust!!).
Not sure if the reason is the cleaning method ?? will invistegate it more !!!
| Manar Amer wrote: |
|
In preparation for cleaning the mirrors.
The spincoater has been moved with its bump into the sas of the SBox.
The pure water used will be provided by Alice, as the previous source in the workshop is not available.
|
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|
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
|
Following the observation that when rotating M2 plan mirror of SBox the deformation position of the mode changes.
M2 was replaced with M2 spare of SBox
images of the mirror front side attached before and after cleaning, no spots at the center, but there seems to be 2 spots far from the center of the mirror.
After comparing with old images of M2 SBox spare, they do not appear to be damages, but dust !! (old image attached, taken on 10/12/2020, was never opened after)
| Manar Amer wrote: |
|
PowerPoint shows the detailed images of all the mirrors before and after cleaning.
Images of SBox mirrors and M1 from Gamma factory attached only for the front after cleaning
the lines showing are on the back of the mirrors, they come from the spinning mount the mirrors are fixed on in the spin-coater.
Naming code :
M#BB - M# mirror Back Before cleaning
M#BA - M# mirror Back After cleaning
M#FB - M# mirror Front Before cleaning
M#FA - M# mirror Front After cleaning
G : Gamma factory
| Manar Amer wrote: |
|
Images of the SBox mirrors cleaned at the same time when the cavity was aligned.
Directly from the spincoater to the SBox directly.
PowerPoint attached shows details
| Manar Amer wrote: |
|
Used the spincoater and pure water to clean dielectric mirrors which will be installed inside the SBox for directing the reflection line.
The method : place pure alchole on mirror - wipe it using white sterile tissue (in one direction) - clean with pure water in spincoater suing cotton swap .
After multible rounds, the result in the images was obtained. there is still a significant amount of dust particles (not all could be dust!!).
Not sure if the reason is the cleaning method ?? will invistegate it more !!!
| Manar Amer wrote: |
|
In preparation for cleaning the mirrors.
The spincoater has been moved with its bump into the sas of the SBox.
The pure water used will be provided by Alice, as the previous source in the workshop is not available.
|
|
|
|
|
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Spincoater - Mirrror cleaning , posted by Manar Amer at Optical room about lasers and optics | utilities
|
While repeating the alignment, the mirrors were cleaned using the spin-coater and placed again.
The current mirrors placed in the SBox are
M1 plane injection from Gamma factory
M2 plane from SBox spare
M3/M4 spherical from SBox main set
no visible damage seen on the mirrors with the microscope
no images of the surfaces were taken due to time constraint.
| Manar Amer wrote: |
|
Following the observation that when rotating M2 plan mirror of SBox the deformation position of the mode changes.
M2 was replaced with M2 spare of SBox
images of the mirror front side attached before and after cleaning, no spots at the center, but there seems to be 2 spots far from the center of the mirror.
After comparing with old images of M2 SBox spare, they do not appear to be damages, but dust !! (old image attached, taken on 10/12/2020, was never opened after)
| Manar Amer wrote: |
|
PowerPoint shows the detailed images of all the mirrors before and after cleaning.
Images of SBox mirrors and M1 from Gamma factory attached only for the front after cleaning
the lines showing are on the back of the mirrors, they come from the spinning mount the mirrors are fixed on in the spin-coater.
Naming code :
M#BB - M# mirror Back Before cleaning
M#BA - M# mirror Back After cleaning
M#FB - M# mirror Front Before cleaning
M#FA - M# mirror Front After cleaning
G : Gamma factory
| Manar Amer wrote: |
|
Images of the SBox mirrors cleaned at the same time when the cavity was aligned.
Directly from the spincoater to the SBox directly.
PowerPoint attached shows details
| Manar Amer wrote: |
|
Used the spincoater and pure water to clean dielectric mirrors which will be installed inside the SBox for directing the reflection line.
The method : place pure alchole on mirror - wipe it using white sterile tissue (in one direction) - clean with pure water in spincoater suing cotton swap .
After multible rounds, the result in the images was obtained. there is still a significant amount of dust particles (not all could be dust!!).
Not sure if the reason is the cleaning method ?? will invistegate it more !!!
| Manar Amer wrote: |
|
In preparation for cleaning the mirrors.
The spincoater has been moved with its bump into the sas of the SBox.
The pure water used will be provided by Alice, as the previous source in the workshop is not available.
|
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100W CELIA laser amplifier "how's to" document, posted by Ronic Chiche at Optical room about lasers and optics | software
|
1st version of the document.
if some information is not correct or missing, give any comment by replying to this post. |
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
|
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it. |
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
|
Current setup at SBox for locking the cavity
After spacial matching, the coupling increased to ~ 15 - 20 %
The locking was done for the fundamental mode, tried to improve the coupling with the motors, but the lock is very unstable to be investigated. (Note: the cavity in under normal pressure)
| Manar Amer wrote: |
|
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it.
|
|
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
|
Cavity locked today under vacuum and no airflow, it is stable over a long time
the alignment was improved and an increase of the transmission by 20 % from its original value
unfortunately, data from the oscilloscope was saved, but it was not in the correct format (image) to show.
Attached ; the mode shape, the new motor positions.
| Manar Amer wrote: |
|
Current setup at SBox for locking the cavity
After spacial matching, the coupling increased to ~ 15 - 20 %
The locking was done for the fundamental mode, tried to improve the coupling with the motors, but the lock is very unstable to be investigated. (Note: the cavity in under normal pressure)
| Manar Amer wrote: |
|
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it.
|
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|
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Cavity Lock , posted by Manar Amer at Optical room about lasers and optics | detectors and electronics | software
|
Closing the series for the setup
The cavity was only locked @ 133.33 MHz but the Finesse was not measured
The FSR was changed to match the new laser MENHIR 216.6625 MHz
| Manar Amer wrote: |
|
Cavity locked today under vacuum and no airflow, it is stable over a long time
the alignment was improved and an increase of the transmission by 20 % from its original value
unfortunately, data from the oscilloscope was saved, but it was not in the correct format (image) to show.
Attached ; the mode shape, the new motor positions.
| Manar Amer wrote: |
|
Current setup at SBox for locking the cavity
After spacial matching, the coupling increased to ~ 15 - 20 %
The locking was done for the fundamental mode, tried to improve the coupling with the motors, but the lock is very unstable to be investigated. (Note: the cavity in under normal pressure)
| Manar Amer wrote: |
|
Start with the cavity lock images attached, taken from last week, at start we have a coupling ~ 5% and started improving on the alignment .
The image of 00 modes attached corresponds to the coupling seen on the oscilloscope.
We have a higher coupling with the 11 mode due to the size of the injected beam in comparison to mode
lenses were added to improve it.
|
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|
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