IFO Modeling

IFo modeling tools can be found in the svn directory https://nodus.ligo.caltech.edu:30889/svn/trunk/ifomodeling/.

Optickle

Author: Matt Evans.

The Optickle modeling package is part of the ISCmodeling tools. The svn contain the latest version as of Feb-02-2010.

Documented and written in a way that be read by others.

It is independent to looptickle.

40m Upgrade Optickle Model

The 40m model file is contained under the config40m directory of looptickle.

The model represents the interferometer according to this layout:

attachment:IFO_diagram.png

The sub-cavities of the model are individually set in the following ways:

• Arm Cavities resonant for the carrier; non resonant for the sidebands
• Michleson: resonant for the carrier; Schnupp asymmetry of 0.0307 m
• PRC anti-resonant for the carrier; resonant for both sidebands
• SRC resonant for

Looptickle

Author: Stefan Ballmer

The package adds control loops to the Optickle model.

Undocumented and written with code not easy to read.

Matlab model of optical cavities

Author: Alberto Stochino

It is a semi-analythical modeling package. The two building blocks of the models are a Fabry-Perot function and a Michelson function. Each function replaces either a cavity or a Michelson, with an effective compound mirror. the functions return complex reflectance and transmittance. The input parameters are the most generic. The surfaces of all mirrors are treated individually, i.e. reflectance and transmittance can be set independently for each side of a mirror.

Macroscopic length and microscopic offsets are passed to the functions as inputs.

By nesting any combination of cavities in the proper way and order, one can build up a compound mirror representing coupled cavities or the whole interferometer. then the reflectivity and transmissivity of the compound mirror will be the Bright and Dark port outputs, respectively.

All functions contain a detailed help description.