Differences between revisions 2 and 16 (spanning 14 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

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
Budget above noises, but especially investigate polarization stability.
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.

-  ⇤ ← Revision 2 as of 2017-10-27 04:50:45 → 
  Size: 14
  Editor: KevinkunsATligoDOTorg
  Comment:
+   ← Revision 16 as of 2019-04-06 01:58:35 → ⇥
  Size: 1622
  Editor: KevinkunsATligoDOTorg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-Noise Budget
+= 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 ====
 * 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
 * Budget above noises, but especially investigate polarization stability.
 * 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 [[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]]