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| ---- . The FSS has a [[PSL/Frequency Stabilization Servo/SLOW PID servo|/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 == * [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) * TT ISS Box (by Flavio Nocera w/ lots of prodding from Rana) * [http://www.ligo.caltech.edu/docs/D/D980401-B1.pdf VCO Driver Box] (R. Abbott) * FSS RFPD (old LSC kind by Dale Ouimette) * Variac on the HEPA (D. Busby's handiwork) ---- . '''Test Results for The New TTFSS''' * [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=22273 Test Result box #6] (Chalermsongsak, Arai) ---- |
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| ---- 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''. |
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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 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
[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)
- TT ISS Box (by Flavio Nocera w/ lots of prodding from Rana)
[http://www.ligo.caltech.edu/docs/D/D980401-B1.pdf VCO Driver Box] (R. Abbott)
- FSS RFPD (old LSC kind by Dale Ouimette)
- Variac on the HEPA (D. Busby's handiwork)
Test Results for The New TTFSS
[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=22273 Test Result box #6] (Chalermsongsak, Arai)
See also PSL.
attachment:C1PSL_FSS.png
References
[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).