Development of displacement- and frequency-noise-free interferometer in 3-D configuration for gravitational wave detection

TL;DR

This paper reports the first complete demonstration of a 3-D displacement- and frequency-noise-free interferometer for gravitational wave detection, achieving significant noise suppression and confirming its response to gravitational waves.

Contribution

It presents the development and experimental validation of a 3-D DFI, advancing from previous 2-D prototypes to a fully operational 3-D configuration.

Findings

Displacement noise suppressed by up to 40 dB.

Successful confirmation of DFI response to gravitational waves.

Complete 3-D DFI demonstration achieved.

Abstract

The displacement- and frequency-noise-free interferometer (DFI) is a multiple laser interferometer array for gravitational wave detection free from both the displacement noise of optics and laser frequency noise. So far, partial experimental demonstrations of DFI have been done in 2-D table top experiments. In this paper, we report the complete demonstration of a 3-D DFI. The DFI consists of four Mach-Zehnder interferometers with four mirrors and two beamsplitters. The displacement noises both of mirrors and beamsplitters were suppressed by up to 40 dB. The non-vanishing DFI response to a gravitational wave was successfully confirmed using multiple electro-optic modulators and computing methods.