Normal-mode splitting in the optomechanical system with an optical parametric amplifier and coherent feedback

TL;DR

This paper demonstrates how normal-mode splitting in an optomechanical system can be controlled and enhanced using optical parametric amplification and coherent feedback, enabling better observation of quantum phenomena.

Contribution

It introduces a method to engineer and optimize normal-mode splitting in optomechanical systems via combined optical parametric amplification and coherent feedback.

Findings

NMS can be flexibly engineered using OPA and CF.

NMS can be enhanced by optimizing input power, OPA gain, and phase.

The approach improves the observability of quantum effects in optomechanics.

Abstract

Strong coupling in optomechanical systems is the basic condition for observing many quantum phenomena such as optomechanical squeezing and entanglement. Normal-mode splitting (NMS) is the most evident signature of strong coupling systems. Here we show the NMS in the spectra of the movable mirror and the output field in an optomechanical system can be flexibly engineered by a combination of optical parametric amplifier (OPA) and coherent feedback (CF). Moreover, the NMS could be enhanced by optimizing the parameters such as input optical power, OPA gain and phase, CF strength in terms of amplitude reflectivity of beam splitter.