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arXiv · 1203.2853

Deep phase modulation interferometry

Gerhard Heinzel·Felipe Guzmán Cervantes·Antonio F. García Marín·Joachim Kullmann·Wang Feng·Karsten Danzmann
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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.

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Gerhard Heinzel, Felipe Guzmán Cervantes, Antonio F. García Marín, Joachim Kullmann, Wang Feng, Karsten Danzmann. 2012-03-13. Deep phase modulation interferometry. https://doi.org/10.1364/oe.18.019076

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