Demonstration of Displacement- and Frequency-Noise-Free Laser Interferometry Using Bidirectional Mach-Zehnder Interferometers
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 while maintaining gravitational-wave signals. The attained maximum displacement-noise suppression was 45 dB.
© 2007 American Physical Society. (Received 27 August 2006; published 2 April 2007) We thank Albrecht Rüdiger and Koji Arai for helpful discussions and comments. This research was partially supported by the 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).
Submitted - 0608095.pdf
Published - PhysRevLett.98.141101.pdf