Precise alignment monitor based on an optical frequency comb (8th report)

Evaluation for prototypes of the optical module

Abstract

We develop an alignment monitor which can detect fluctuations of micrometer in a severe environment of high magnetic field and vacuum for a term longer than several months. It consists of a 3-dimensional measurement grid of multiple optical fiber introduced absolute distance interferometers based on an optical frequency comb. Here, we evaluate a prototype of a ball lens module, which configures the measurement paths of the interferometers.