Differences between revisions 1 and 20 (spanning 19 versions)

Balanced Homodyne Detection

Requirements

Displacement noise of OMC/LMC mirrors
Scatter loss in mirrors
Cavity design: triangle, quad ring, quad zig-zag (reference the new OMC paper from Koji)
Laser amplitude / frequency noise including DC offsets in various other lock points and motions to simulate bilinear noise
Oscillator noise: AM / FM
Aux length noise: MICH/PRC/ SRC
Req. on offsets/asymmetries: arm finesse, arm reflectivity, mass imbalance of ETMs
Phase noise of LO
Polarization stability requirement for polarization BHD
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.
Can we add a heater back to OMC mirror to control ROC? How should the temperature be sensed and controlled?

Modeling/Noise Budget

Some BHD modeling is done in the OptimalGWextraction repo here.

-  ⇤ ← Revision 1 as of 2017-10-27 04:47:55 → 
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+   ← Revision 20 as of 2019-04-06 02:16:50 → ⇥
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+= Balanced Homodyne Detection =


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

==== Action items ====
 * 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
 * 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.
 * Can we add a heater back to OMC mirror to control ROC? How should the temperature be sensed and controlled?

==== Modeling/Noise Budget ====
 * Some BHD modeling is done in the OptimalGWextraction repo [[https://github.com/CaltechExperimentalGravity/OptimalGWextraction/tree/master/PonderSqueeze/BHD|here]].

==== Polarization BHD ====
 * [[https://dcc.ligo.org/LIGO-G1802013|Some thoughts on polarization BHD (LIGO-G1802013)]]
 * [[attachment:OMC.pdf|Polarization BHD notes]]

==== Other Links ====
 * [[https://wiki.ligo.org/AIC/BHD_A_plus|A+ BHD wiki]]
 * [[https://wiki.ligo.org/AIC/BHD_MIT_WS|MIT A+ BHD workshop wiki]]