The "optical lever" intracavity readout scheme for gravitational-wave antennae

TL;DR

This paper introduces the 'optical lever' intracavity readout scheme for gravitational-wave detectors, offering significant signal displacement gain akin to a mechanical lever, potentially enhancing detection sensitivity.

Contribution

The paper proposes a novel 'optical lever' scheme that improves intracavity readout by amplifying local mirror displacement signals in gravitational-wave antennas.

Findings

Significant gain in local mirror displacement signal.

Potential for enhanced gravitational-wave detection sensitivity.

Analogous to mechanical lever amplification.

Abstract

An improved version of the ``optical bar'' intracavity readout scheme for gravitational-wave antennae is considered. We propose to call this scheme ``optical lever'' because it can provide significant gain in the signal displacement of the local mirror similar to the gain which can be obtained using ordinary mechanical lever with unequal arms. In this scheme displacement of the local mirror can be close to the signal displacement of the end mirrors of hypothetical gravitational-wave antenna with arm lengths equal to the half-wavelength of the gravitational wave.