Robust squeezed light against mode mismatch using a self imaging optical parametric oscillator

TL;DR

This paper demonstrates a self-imaging optical parametric oscillator that produces squeezed light resilient to spatial mode mismatch, outperforming traditional single-mode squeezed light under various mismatch conditions.

Contribution

It introduces a self-imaging optical parametric oscillator that generates robust squeezed light, enhancing stability against mode mismatch compared to conventional methods.

Findings

Generated light is more robust to mode mismatch than single-mode squeezed light.

Robustness increases as mode mismatch strength grows.

Outperforms infinitely squeezed single-mode light under high mismatch.

Abstract

We present squeezed light that is robust against spatial mode mismatch (beam displacement, tilt, and beam-size difference), which is generated from a self-imaging optical parametric oscillator below the threshold. We investigate the quantum properties of the generated light when the oscillator is detuned from the ideal self-imaging condition for stable operation. We find that the generated light is more robust to mode mismatch than single-mode squeezed light having the same squeezing level, and it even outperforms the single-mode infinitely squeezed light as the strength of mode mismatch increases.