Infrared upconversion hyperspectral imaging.

Area of Science:

• Optics and Photonics
• Spectroscopy
• Materials Science

Background:

• Mid-infrared (mid-IR) imaging offers valuable chemical and material information.
• Traditional mid-IR imaging systems can be complex and expensive.
• Hyperspectral imaging provides detailed spectral information for material identification.

Purpose of the Study:

• To demonstrate a novel method for mid-IR hyperspectral imaging.
• To utilize nonlinear frequency upconversion for image generation.
• To capture both spatial and spectral information in the mid-IR range.

Main Methods:

• Nonlinear frequency upconversion of mid-IR light.
• Acquisition of upconverted images under varying phase-matching conditions.
• Generation of monochromatic images in the 3.2-3.4 μm range.
• Imaging of a United States Air Force resolution target and a polystyrene film.

Main Results:

• Successful demonstration of mid-IR hyperspectral imaging.
• Generation of a sequence of monochromatic images.
• Acquisition of images containing both spatial resolution and spectral signatures.
• Identification of spectral features from the polystyrene film.

Conclusions:

• Nonlinear frequency upconversion is a viable technique for mid-IR hyperspectral imaging.
• Standard Si-based CCD cameras can be used for detecting upconverted mid-IR light.
• The developed method enables simultaneous spatial and spectral analysis in the mid-IR.