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⇤ ← Revision 17 as of 2019-04-06 01:59:18 →
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Editor: KevinkunsATligoDOTorg
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← Revision 19 as of 2019-04-06 02:09:05 → ⇥
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Editor: KevinkunsATligoDOTorg
Comment:
Deletions are marked like this. Additions are marked like this.
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 * SRC design
  * Suppress 02/20 modes
  * Partially transmit 01/10 modes for AS WFS
  * Suppress thermally generated modes
  * After the above have been satisfied, maximize ponderomotive squeezing		  * Design SRC so that
  1. Suppress 02/20 modes
  1. Partially transmit 01/10 modes for AS WFS
  1. Suppress thermally generated modes
  1. After the above have been satisfied, choose transmission to maximize ponderomotive squeezing

Balanced Homodyne Detection

Requirements

  1. Displacement noise of OMC/LMC mirrors
  2. Scatter loss in mirrors
  3. Cavity design: triangle, quad ring, quad zig-zag (reference the new OMC paper from Koji)
  4. Laser amplitude / frequency noise including DC offsets in various other lock points and motions to simulate bilinear noise
  5. Oscillator noise: AM / FM
  6. Aux length noise: MICH/PRC/ SRC
  7. Req. on offsets/asymmetries: arm finesse, arm reflectivity, mass imbalance of ETMs
  8. Phase noise of LO
  9. Polarization stability requirement for polarization BHD
  10. Backscatter

Action items

  • Design SRC so that
    1. Suppress 02/20 modes
    2. Partially transmit 01/10 modes for AS WFS
    3. Suppress thermally generated modes
    4. After the above have been satisfied, choose transmission to maximize ponderomotive squeezing
  • Budget above noises, but especially investigate polarization stability.
  • How is homodyne angle controlled?
  • Beam routing
    • Where to pick off LO?
    • Can we use ETMX transmission for LO? (Koji is crazy)
  • A+ BHD noise budget for both baseline double OMC and polarization BHD.

Modeling/Noise Budget

  • Some BHD modeling is done in the OptimalGWextraction repo here.

Polarization BHD

Balanced Homodyne Detection (last edited 2020-04-29 17:41:39 by JonathanrichardsonATligoDOTorg)