Investigation into Cavity Axis Shifts and Tilts Using the Finesse Modal Model

Document #:

LIGO-T1900708-v3

Document type:

T - Technical notes

Abstract:

We investigate using the modal model to predict cavity axis tilts and shifts in response to mirror motion. We compare our results against a geometric analysis of the cavity and find that the inclusion of loss in the modal model leads to a small change in the predicted spot position. We outline a general method using Finesse to predict spot positions and wavefront tilts throughout the detector.

Files in Document:

• main.pdf (919.0 kB)

Topics:

• Sensing and Control
• Basic R&D

Authors:

• Aaron Goodwin-Jones
• Mauricio Diaz-Ortiz
• Luis Ortega
• Alasdair James

Keywords:

finesse modal model cavity axis mirror tilt

Notes and Changes:

Fixed error in Fig 2, clarified version of Finesse.