Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Precision Measurements and Metrology IV (with A)
Q 16.6: Talk
Tuesday, March 1, 2016, 12:15–12:30, a310
Deep frequency modulation interferometry — •Oliver Gerberding1,2, Katharina-Sophie Isleif1, Thomas Schwarze1, Moritz Mehmet1, Gerhard Heinzel1, and Felipe Guzman Cervantes2 — 1Albert Einstein Institut, Institut für Gravitationsphysik, Callinstraße 38, 30167 Hannover — 2Joint Quantum Institute, National Institute of Standards and Technology, Maryland, USA
Laser interferometry with pm/√Hz precision and multi-fringe dynamic range at low frequencies is a core technology to measure the motion of various objects (test masses) in space and ground based experiments for gravitational wave detection and geodesy. Even though available interferometer schemes are well understood, their construction remains complex, often involving the need to build quasi-monolithic optical benches with dozens of components. Here we present a new scheme that uses strong laser frequency modulations in unequal arm-length interferometers in combination with a fit algorithm originally developed for the readout of strong phase modulations, the so-called deep phase modulation interferometry. This combination is the basis for the development of a more elegant interferometric sensing toolset for future missions that requires much smaller and simpler interferometric sensors while using advanced digital signal processing for the phase recovery. We discuss noise influences, both from classic sources and new, technique-specific couplings and we present first results achieved in simulations and experiments.