Optical Layout and Parameters for the Advanced LIGO Cavities

Document #:

LIGO-T0900043-v4

Document type:

T - Technical notes

Abstract:

This document describes the optical parameters of the various cavities for Advanced LIGO. The lengths between various optical elements, ROC values of the mirrors, and their tolerances are listed. The various cavity parameters like Finesse, linewidths, and transversal mode spacing are calculated. Included also are the higher order modes offsets from resonances. The recycling cavity parameters are picked assuming that the TCS keeps the IFO same for both the cold as well as full power operation. The ROCs of the recycling cavity mirrors can be changed a little such that the recycling cavity matches the arm cavity mode at reduced power without engaging TCS.

Files in Document:

• LIGO-T0900043-04.pdf (154.3 kB)

Topics:

• Input Optics
• System Engineering
• Core Optics
• Sensing and Control

Authors:

• Muzammil Arain

Notes and Changes:

Based upon Hiro's tests of the optical parameters presented here, I am updating this document. There are very minor changes. Mainly I have increased the significant digits of the ROC values. I would encourage people to use all the significant digits presented for the ROC and distance values.

Referenced by: