Deep phase modulation interferometry
Optics
2012-03-22 v2 Instrumentation and Methods for Astrophysics
General Relativity and Quantum Cosmology
Instrumentation and Detectors
Space Physics
Abstract
We have developed a method to equip homodyne interferometers with the capability to operate with constant high sensitivity over many fringes for continuous real-time tracking. The method can be considered as an extension of the "J_1...J_4" methods, and its enhancement to deliver very sensitive angular measurements through Differential Wavefront Sensing is straightforward. Beam generation requires a sinusoidal phase modulation of several radians in one interferometer arm. On a stable optical bench, we have demonstrated a long-term sensitivity over thousands of seconds of 0.1 mrad/sqrt[Hz] that correspond to 20 pm/sqrt[Hz] in length, and 10 nrad/sqrt[Hz] in angle at millihertz frequencies.
Cite
@article{arxiv.1203.2853,
title = {Deep phase modulation interferometry},
author = {Gerhard Heinzel and Felipe Guzmán Cervantes and Antonio F. García Marín and Joachim Kullmann and Wang Feng and Karsten Danzmann},
journal= {arXiv preprint arXiv:1203.2853},
year = {2012}
}