Pulsed squeezed-light generation in a waveguide with second-subharmonic generation and periodic corrugation

TL;DR

This paper investigates how a small periodic corrugation in a waveguide enhances pulsed squeezed-light generation through second-subharmonic generation, improving squeezing and photon numbers.

Contribution

It introduces a perturbation and numerical approach to analyze back-scattering effects, optimizing spectral modes for better squeezed-light generation in waveguides.

Findings

Back-scattering enhances nonlinear interaction and squeezing.

Optimal spectral modes are identified using Bloch-Messiah reduction.

Corrugation resonating with fundamental and second-subharmonic fields improves performance.

Abstract

Quantum pulsed second-subharmonic generation in a planar waveguide with a small periodic corrugation at the surface is studied. Back-scattering of the interacting fields on the corrugation enhances the nonlinear interaction giving larger values of squeezing. The problem of back-scattering is treated by perturbation theory, using the Fourier transform for non-dispersion propagation, and by numerical approach in the general case. Optimum spectral modes for squeezed-light generation are found using the Bloch-Messiah reduction. Improvement in squeezing and increase of numbers of generated photons are quantified for the corrugation resonating with the fundamental and second-subharmonic field. Splitting of the generated pulse by the corrugation is predicted.