Merging L-shaped resonator with Michelson configuration for kilohertz gravitational-wave detection

TL;DR

This paper proposes a hybrid gravitational-wave detector combining an L-shaped resonator with a Michelson configuration, enhancing sensitivity in the 2-4 kHz range without altering the existing control scheme.

Contribution

It introduces a novel hybrid configuration that merges L-shaped resonators with Michelson interferometers for improved kilohertz gravitational-wave detection.

Findings

Enhanced response at 2-4 kHz frequency range.

Retains existing sensing and control scheme.

Higher sensitivity compared to traditional setups.

Abstract

Detection of gravitational waves in kilohertz frequency range is crucial for understanding the physical processes of binary neutron star mergers. In Ref. [Phys. Rev. X {\bf 13}, 021019 (2023)], a new interferometric configuration has been proposed, employing an L-shaped optical resonant cavity as arm cavity. This alteration enhances the detector's response to kHz signals. However, the departure from conventional Michelson configuration necessitates a redesign of its sensing and control scheme, which is currently under study. In this article, we propose replacing linear arm cavities in the conventional Michelson by the L-shaped resonator. This hybrid configuration features an enhanced response at kHz while retaining the same sensing and control scheme as the Michelson setup. At the conceptual level, it exhibits higher sensitivity in the 2-4 kHz range compared to existing configurations.