Optical cavities as amplitude filters for squeezed fields

TL;DR

This paper investigates using Fabry-Pérot cavities as high-pass filters for squeezed light to enhance gravitational-wave detector sensitivity, potentially eliminating the need for long filter cavities.

Contribution

It introduces a novel approach to filter squeezed light using compact Fabry-Pérot cavities, providing a practical alternative to long filter cavities in gravitational-wave detectors.

Findings

Fabry-Pérot cavities can effectively serve as high-pass filters for squeezed light.

The proposed configurations improve detector sensitivity without long filter cavities.

The paper provides parameter derivations for optimal cavity performance.

Abstract

We explore the use of Fabry-P\'erot cavities as high-pass filters for squeezed light, and show that they can increase the sensitivity of interferometric gravitational-wave detectors without the need for long (kilometer scale) filter cavities. We derive the parameters for the filters, and analyze the performance of several possible cavity configurations in the context of a future gravitational-wave interferometer with squeezed light (vacuum) injected into the output port.