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Published July 31, 2008 | Published
Journal Article Open

Displacement noise free interferometory for gravitational wave detection


We have demonstrated displacement- and frequency-noise-free laser interferometry (DFI) by partially implementing a recently proposed optical configuration using bidirectional Mach-Zehnder interferometers (MZIs). This partial implementation, the minimum necessary to be called DFI, has confirmed the essential feature of DFI: the combination of two MZI signals can be carried out in a way that cancels displacement noise of the mirrors and beam splitters while maintaining gravitational-wave signals. The attained maximum displacement noise suppression was 45 dB.

Additional Information

© 2008 IOP Publishing Ltd. 10th Int. Conf. on Topics in Astroparticle and Underground Physics. This research was partially supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology under Grant-in-Aid for Scientific Research (B), No. 18340070, 2006. R. L.W. was supported by the U.S. National Science Foundation under Cooperative Agreement No. PHY-0107417. The research of Y. C., A. P., and K. S. is supported by the Alexander von Humboldt Foundation's Sofja Kovalevskaja Programme (funded by the German Ministry of Education and Research).

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