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Demonstration of displacement- and frequency-noise free laser interferometry using bi-directional Mach-Zehnder interferometers

Shuichi Sato·Seiji Kawamura·Keiko Kokeyama·Robert L. Ward·Yanbei Chen·Archana Pai·Kentaro Somiya
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Abstract

We have demonstrated displacement- and frequency-noise free laser interferometry (DFI) by partially implementing a recently proposed optical configuration using bi-directional Mach-Zehnder interferometers (MZI). 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 which cancels displacement noise of the mirrors while maintaining gravitational wave signals. The attained maximum displacement noise suppression allowed a simulated-SNR of 45dB.

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Shuichi Sato, Seiji Kawamura, Keiko Kokeyama, Robert L. Ward, Yanbei Chen, Archana Pai, Kentaro Somiya. 2007-04-19. Demonstration of displacement- and frequency-noise free laser interferometry using bi-directional Mach-Zehnder interferometers. https://doi.org/10.1103/physrevlett.98.141101

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