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.
@article{arxiv.2110.05296,
title = {Robust squeezed light against mode mismatch using a self imaging optical parametric oscillator},
author = {Chan Roh and Geunhee Gwak and Young-Sik Ra},
journal= {arXiv preprint arXiv:2110.05296},
year = {2021}
}