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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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To lock:  . To lock:    
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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''.
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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''. == List of FSS Related Electronics Schematics ==
 * MC Servo: [[attachment:D040180-C-1 MC_Servo.pdf]]
 * [[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)
 * 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]]
 * Variac on the HEPA (D. Busby's handiwork)
 * TTFSS interface board diagrams: [[attachment:D040423-A.pdf]] (Rev A, includes the DIN96 connector), [[attachment:D040423-C.pdf]] (Rev C), [[attachment:fssxcon.pdf]] (old xcon schematics)
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See also [[PSL]].  . '''Test Results for The New TTFSS'''
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attachment:C1PSL_FSS.png  * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=20783|Test Plan]](Cervantes, Schwinberg, Savage)

 * 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)

----
 See also [[PSL]].

{{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.

  • MC Servo: D040180-C-1 MC_Servo.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)

  • 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)

  • TTFSS interface board diagrams: D040423-A.pdf (Rev A, includes the DIN96 connector), D040423-C.pdf (Rev C), fssxcon.pdf (old xcon schematics)

C1PSL_FSS.png

References

  • P960008-10: Improved Multistage Wide Band Laser Frequency Stabilization, by Seiji Kawamura, Alex Abramovici, Mike Zucker (1996).

PSL/Frequency_Stabilization_Servo (last edited 2020-03-03 01:44:19 by YehonathandroriATligoDOTorg)