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| || 3-E || phase lock the VCO || if the MC is too loud, MCL feedback is needed ||<:>attachment:green.png || || | || 3-E || phase lock the VCO || ||<:>attachment:green.png || || |
GOALs of this month
1. to stabilize the PSL by taking the green beat note signal and actuating the MC length while assuming the X arm is a stable reference
2. to measure the stability of the beat note and to compare it with that of the IR PDH signal
=> above two actions finally answer the question : the green locking is stable enough to hand off the control servo to IR or not ?
Action Items
Indicators |
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attachment:green.png complete |
attachment:orange.png intermediate state |
attachment:red.png nothing happened |
attachment:black.png gave up |
Step 1. X arm alignment for IR |
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|
action |
description |
status |
notes |
1-A |
setup DC_PD at an available port |
to find a fringe |
attachment:green.png |
attachment:help.png put Thorlabs PDA255 at AS |
1-B |
align BS, ITMX and ETMX |
to have TEM00 flash |
attachment:green.png |
put a camera at ETMX_TRANS |
1-C |
place TRANS_MON_PD and QPD |
|
attachment:orange.png |
|
1-D |
hook it up TRANS_MON and QPD to ADC |
c1iscex |
attachment:green.png |
|
1-E |
make a simple mod/demod system |
to lock the IR |
attachment:green.png |
attachment:help.png |
1-F |
feeding back the signal to MCL |
to lock the IR |
attachment:green.png |
attachment:help.png |
1-G |
add a LOCKIN module into c1sus and c1iscex |
for A2L |
attachment:red.png |
|
1-H |
A2L for IR |
for precise alignment |
attachment:red.png |
touch PZT1 and PZT2 ? |
Step 2. Re-alignment of green |
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|
action |
description |
status |
notes |
2-A |
change beam axis |
steer the mirrors at X end |
attachment:green.png |
attachment:help.png |
2-B |
rearrange the optical setup at X end |
if necessary |
attachment:green.png |
|
2-C |
lock the green to X arm |
|
attachment:green.png |
|
2-D |
more precisely overlap the green beam axis to the IR |
using A2L |
attachment:red.png |
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Step 3. Beat note detection |
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|
action |
description |
status |
notes |
3-A |
finalize the setup at PSL table |
Electronics, cables and etc.,.. |
attachment:orange.png |
|
3-B |
alignment of optics at PSL table |
|
attachment:green.png |
|
3-C |
temperature tuning of the lasers |
|
attachment:green.png |
attachment:help.png |
3-D |
check frequency counter |
|
attachment:green.png |
attachment:help.png |
3-E |
phase lock the VCO |
|
attachment:green.png |
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Step 4. Digital control to stabilize the PSL |
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|
action |
description |
status |
notes |
4-A |
connect VCO signal to ADC |
c1ioo or c1lsc |
attachment:red.png |
attachment:help.png |
4-B |
connect some monitor signals to ADC |
green refl, trans, ..etc., |
attachment:red.png |
|
4-B |
simulink model refinement |
|
attachment:red.png |
|
4-C |
DAQ setting |
|
attachment:red.png |
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4-D |
feedback to MC2 length |
|
attachment:red.png |
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4-E |
medm screen |
|
attachment:red.png |
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Step 5. measurement |
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|
action |
description |
status |
notes |
5-A |
cavity scan |
adding offsets onto MC2 feedback |
attachment:red.png |
|
5-B |
measure the stability of beat note and IR PDH |
|
attachment:red.png |
|
5-C |
perform the same measurement while X arm is locked to IR |
|
attachment:red.png |
optional (?) |