SPDC in ppLN ridge waveguide: an analysis for efficient twin photon generation at 1550 nm

TL;DR

This paper analyzes a Lithium Niobate ridge waveguide's modal properties and quantum processes to optimize twin photon generation at 1550 nm, demonstrating enhanced efficiency over bulk crystals.

Contribution

It provides a detailed quantum and modal analysis of a customized LN waveguide for efficient twin photon generation at telecom wavelengths, including optimization of input parameters.

Findings

Down conversion processes predicted and optimized.

Generation of signal/idler at 1550 nm confirmed.

PDC signal power scales as L^(3/2), surpassing bulk crystal dependence.

Abstract

We study modal characteristics of a customized ridge waveguide in Lithium Niobate designed to generate twin photons at telecom wavelength. A quantum analysis of SPDC predicts the possible down conversion processes and optimizes the input beam parameters for fundamental mode emission. Further, a Joint Spectral Amplitude (JSA) analysis ensures the generation of signal/idler at 1550 nm in the customized LN waveguide. A calculation of the parametric down conversion (PDC) signal power shows a dependence of L^(3/2) for a waveguide compared to a linear dependence in case of bulk crystal.