Bright correlated twin-beam generation and radiation shaping in high-gain parametric down-conversion with anisotropy

TL;DR

This paper presents a theoretical study on how high-gain parametric down-conversion in anisotropic crystals can generate bright twin-beams and shape radiation, turning anisotropy from a limiting factor into a useful tool.

Contribution

It provides a rigorous theoretical framework for understanding bright twin-beam generation in anisotropic nonlinear crystals at high gain, including mode structure and radiation shaping.

Findings

Bright correlated twin-beams can be generated at high gain due to anisotropy.

Anisotropy and crystal spacing can be used for radiation shaping.

Theoretical description of spatial properties of bright squeezed light in anisotropic systems.

Abstract

Uniaxial anisotropy in nonlinear birefringent crystals limits the efficiency of nonlinear optical interactions and breaks the spatial symmetry of light generated in the parametric down-conversion (PDC) process. Therefore, this effect is usually undesirable and must be compensated for. However, high gain may be used to overcome the destructive role of anisotropy and instead to use it for the generation of bright two-mode correlated twin-beams. In this work, we provide a rigorous theoretical description of the spatial properties of bright squeezed light in the presence of strong anisotropy. We investigate a single-crystal and a two-crystal configuration and demonstrate the generation of bright correlated twin-beams in such systems at high gain due to anisotropy. We explore the mode structure of the generated light and show how anisotropy, together with crystal spacing, can be used for radiation shaping.