Up-conversion imaging processing with field-of-view and edge enhancement

TL;DR

This paper introduces a novel up-conversion imaging method that significantly enhances the field-of-view and edge detection capabilities using nonlinear frequency conversion, with promising applications in biomedicine and remote sensing.

Contribution

It presents two configurations for FOV enhancement in up-conversion imaging using second order nonlinear frequency conversion, achieving over 4.5 times FOV increase with controllable patterns.

Findings

Over 4.5 times FOV enhancement achieved

Numerical simulations agree with experimental results

Potential applications in biomedicine and remote sensing

Abstract

Spiral phase contrast is an important and convenient imaging processing technology in edge detection, and a broader field-of-view (FOV) of imaging is a long-pursuing aim to see more regions of the illumination objects. Compared with near-infrared (NIR) spectrum, the up-conversion imaging in visible spectrum benefits from the advantages of higher efficiency detection and lower potential speckle. FOV enhanced and spiral phase contrast up-conversion imaging processing methods by using second order nonlinear frequency up-conversion from NIR spectrum to visible spectrum in two different configurations are presented in this work. By changing the temperature of crystal, controllable spatial patterns of imaging with more than 4.5 times enhancement of FOV is realized in both configurations. Additionally, we present numerical simulations of the phenomenon, which agree well with the experimental observations. Our results provide a very promising way in imaging processing, which may be widely used in biomedicine, remote sensing and up-conversion monitoring.