Transverse spatial and frequency properties of two-photon states generated by spontaneous parametric down-conversion

TL;DR

This paper analyzes the spatial and frequency properties of two-photon states generated by spontaneous parametric down-conversion, considering anisotropy and frequency spread, with theoretical expressions validated against experimental data.

Contribution

It provides detailed theoretical expressions for two-photon states in SPDC, including anisotropy effects, and compares these with experimental results for validation.

Findings

Good agreement between theory and experiment

Accurate modeling of anisotropy effects

Simplified expressions for practical use

Abstract

We present a detailed account of the two-photon states generated by SPDC in both type I and type II phase matching, including the effects of anisotropy of the nonlinear medium and the frequency spread of the down-converted fields. Accurate as well as simplified expressions are derived for type I and type II phase matching in the context of Fourier Optics. The main results are compared with experimental data available in the literature, showing good agreement in all cases.