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Mid-infrared edge-enhanced imaging via angle-selective nonlinear filtering.

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This study introduces a new mid-infrared upconversion imaging technique. It allows seamless switching between bright-field and edge-enhanced imaging without altering system settings, enabling compact, all-optical infrared image processing.

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Area of Science:

Nonlinear Optics
Optical Imaging
Infrared Spectroscopy

Background:

Mid-infrared imaging is crucial for various scientific and industrial applications.
Current upconversion imaging techniques often require complex adjustments for modality switching.
Developing tunable and reconfigurable imaging systems is an ongoing challenge.

Purpose of the Study:

To propose a novel scheme for mid-infrared upconversion imaging with tunable bright-field and edge-enhanced modalities.
To demonstrate all-optical Fourier processing capabilities through nonlinear optical engineering.
To achieve reconfigurable imaging without altering system settings.

Main Methods:

Engineering the nonlinear optical process to shape the optical transfer function.
Configuring a nonlinear angle-selective filter for all-optical Fourier processing.
Numerical demonstration of modality switching via crystal temperature tuning and dichromatic illumination.

Main Results:

Successful numerical demonstration of switching between bright-field and edge-enhanced imaging modalities.
Simultaneous acquisition of both bright-field and edge-enhanced information.
Achieved reconfigurability without changing imaging settings, unlike previous methods.

Conclusions:

The proposed upconversion imaging scheme offers high tunability and reconfigurability.
This architecture enables layout-compact and all-optical processing for infrared images.
The technique provides a novel approach for advanced infrared imaging applications.