Deep phase modulation interferometry

Details Deep phase modulation interferometry Deep phase modulation interferometry

2012-03-13

arxiv.org/abs/1203.2853v2

Optics Express, Vol. 18, Issue 18, pp. 19076-19086 (2010)

Physics

Optics

Scientific paper

10.1364/OE.18.019076

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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