Experimental demonstration of deep frequency modulation interferometry

Katharina Sophie Isleif, Oliver Gerberding, Thomas S. Schwarze, Moritz Mehmet, Gerhard Heinzel, Felipe Guzmán Cervantes

Research output: Contribution to journalArticle

11 Scopus citations


Experiments for space and ground-based gravitational wave detectors often require a large dynamic range interferometric position readout of test masses with 1 pm/√ precision over long time scales. Heterodyne interferometer schemes that achieve such precisions are available, but they require complex optical set-ups, limiting their scalability for multiple channels. This article presents the first experimental results on deep frequency modulation interferometry, a new technique that combines sinusoidal laser frequency modulation in unequal arm length interferometers with a non-linear fit algorithm. We have tested the technique in a Michelson and a Mach-Zehnder Interferometer topology, respectively, demonstrated continuous phase tracking of a moving mirror and achieved a performance equivalent to a displacement sensitivity of 250 pm/√ at 1 mHz between the phase measurements of two photodetectors monitoring the same optical signal. By performing time series fitting of the extracted interference signals, we measured that the linearity of the laser frequency modulation is on the order of 2% for the laser source used.

Original languageEnglish (US)
Pages (from-to)1676-1684
Number of pages9
JournalOptics Express
Issue number2
StatePublished - Jan 25 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Isleif, K. S., Gerberding, O., Schwarze, T. S., Mehmet, M., Heinzel, G., & Cervantes, F. G. (2016). Experimental demonstration of deep frequency modulation interferometry. Optics Express, 24(2), 1676-1684. https://doi.org/10.1364/OE.24.001676