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| The FSS stabilizes the fluctuations in the laser frequency by comparing it to a quiet [[Reference Cavity]]. The light is picked off just before it goes into the [[Pre Mode Cleaner]], sent through a EOM and the frequency shifting AOM and then into the RC. | The FSS stabilizes the fluctuations in the laser frequency by comparing it to a quiet [[Reference_Cavity]]. The light is picked off just before it goes into the [[Pre Mode Cleaner]], sent through a EOM and the frequency shifting AOM and then into the RC. |
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| * [http://www.ligo.caltech.edu/docs/D/D040105-A/D040105-A.pdf TT FSS Box] (by Schwinberg, Myers, and Savage, based on the Rich Abbott original) | * [[http://www.ligo.caltech.edu/docs/D/D040105-A/D040105-A.pdf|TT FSS Box]] (by Schwinberg, Myers, and Savage, based on the Rich Abbott original) |
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| * [http://www.ligo.caltech.edu/docs/D/D980401-B1.pdf VCO Driver Box] (R. Abbott) | * [[http://www.ligo.caltech.edu/docs/D/D980401-B1.pdf|VCO Driver Box]] (R. Abbott) |
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| * Temperature Control Box (Rich Abbott then changes by Hugh Radkins and Paul Schwinberg) [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?.submit=Number&docid=D980400&version= D980400] | * Temperature Control Box (Rich Abbott then changes by Hugh Radkins and Paul Schwinberg) [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?.submit=Number&docid=D980400&version=|D980400]] |
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| * [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=20783 Test Plan](Cervantes, Schwinberg, Savage) | * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=20783|Test Plan]](Cervantes, Schwinberg, Savage) |
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| * Test Results, [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22509 box#05] , [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22273 box#06],[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22356 box#07](Chalermsongsak, Arai) | * Test Results, [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22509|box#05]] , [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22273|box#06]],[[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22356|box#07]](Chalermsongsak, Arai) |
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| attachment:C1PSL_FSS.png | {{attachment:C1PSL_FSS.png}} |
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| * [http://www.ligo.caltech.edu/docs/P/P960008-10.pdf P960008-10]: Improved Multistage Wide Band Laser Frequency Stabilization, by Seiji Kawamura, Alex Abramovici, Mike Zucker (1996). | * [[http://www.ligo.caltech.edu/docs/P/P960008-10.pdf|P960008-10]]: Improved Multistage Wide Band Laser Frequency Stabilization, by Seiji Kawamura, Alex Abramovici, Mike Zucker (1996). |
The FSS stabilizes the fluctuations in the laser frequency by comparing it to a quiet Reference_Cavity. The light is picked off just before it goes into the Pre Mode Cleaner, sent through a EOM and the frequency shifting AOM and then into the RC.
The FSS actuates on the NPRO Piezo (called the FAST path) and on a phase correcting Pockels cell (which is faster than the FAST path).
- To lock:
Run the FSSAutolock script from the C1PSL_FSS screen (under the yellow ! button).
The FSS has a /SLOW PID servo which offloads the FAST (PZT) path by feeding back to the NPRO's SLOW input. The FAST has a rough calibration of 5 MHz/V while the SLOW is more like 5000 MHz/V. It has a ~0.1 Hz pole and so that's why its called SLOW.
List of FSS Related Electronics Schematics
TT FSS Box (by Schwinberg, Myers, and Savage, based on the Rich Abbott original)
- TT ISS Box (by Flavio Nocera w/ lots of prodding from Rana)
VCO Driver Box (R. Abbott)
- FSS RFPD (old LSC kind by Dale Ouimette)
Temperature Control Box (Rich Abbott then changes by Hugh Radkins and Paul Schwinberg) D980400
- Variac on the HEPA (D. Busby's handiwork)
Test Results for The New TTFSS
Test Plan(Cervantes, Schwinberg, Savage)
See also PSL.
References
P960008-10: Improved Multistage Wide Band Laser Frequency Stabilization, by Seiji Kawamura, Alex Abramovici, Mike Zucker (1996).