Near-infrared to visible upconversion imaging using a broadband pump laser

TL;DR

This paper demonstrates a near-infrared to visible upconversion imaging system using a broadband pump laser, significantly increasing the number of resolved spatial elements and achieving high resolution and efficiency.

Contribution

The study introduces a broadband pump laser for upconversion imaging, enabling over ten times more spatial elements than narrowband lasers, with results matching simulations and improved sensitivity.

Findings

Achieved 56x64 spatial resolution in upconversion imaging.

Used a 2.7 nm wide pump spectrum to increase resolved elements.

Sensitivity compares favorably with direct InGaAs camera detection.

Abstract

We present an upconversion imaging experiment from the near-infrared to the visible spectrum. Using a dedicated broadband pump laser to increase the number of resolved elements converted in the image we obtain up to 56x64 spatial elements with a 2.7 nm wide pump spectrum, more than 10 times the number of elements accessible with a narrowband laser. Results in terms of field of view, resolution and conversion efficiency are in good agreement with simulations. The computed sensitivity of our experiment favorably compares with direct InGaAs camera detection.