Orthogonal Spatial Coding with Stimulated Parametric Down-Conversion

TL;DR

This paper introduces a novel orthogonal spatial coding scheme using stimulated parametric down-conversion, enabling image encoding and decoding with potential applications in aberration correction and frequency conversion imaging.

Contribution

It extends orthogonal optical coding to the spatial domain using stimulated parametric down-conversion, demonstrating image encoding, decoding, and correction techniques.

Findings

Successful encoding and decoding of images using the scheme

Potential for aberration cancellation and frequency conversion imaging

Extension of optical coding to the spatial domain

Abstract

Orthogonal optical coding is widely used in classical multiuser communication networks. Using the phase conjugation property of stimulated parametric down-conversion, we extend the current orthogonal optical coding scheme to the spatial domain to encode and decode image information. In this process, the idler beam inherits the complex conjugate of the field information encoded in the seed beam. An encoding phase mask introduced to the input seed beam blurs the image transferred to the idler. The original image is restored by passing the coded transferred image through a corrective phase mask placed in the momentum space of the idler beam. We expect that this scheme can also inspire new techniques in aberration cancellation and frequency conversion imaging.