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This study introduces a new lock-in infrared illumination technique to significantly improve infrared thermal imaging quality. The method enhances contrast and reduces noise for high-resolution microscopic applications.

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Area of Science:

Optics and Photonics
Materials Science
Semiconductor Physics

Background:

Conventional infrared (IR) thermal imaging at ambient temperatures suffers from low image contrast and high noise.
These limitations restrict the application of IR thermal imaging in high-resolution microscopic imaging.
Existing contrast enhancement methods often have drawbacks for practical integration.

Purpose of the Study:

To develop an in-situ method for enhancing infrared image quality in microscopic thermal imaging.
To improve image contrast, resolution, and noise suppression for IR imaging.
To demonstrate the practical application of the developed technique.

Main Methods:

Implementation of an in-situ lock-in infrared illumination approach.
Combination of mid-wave infrared (MWIR) illumination with lock-in synchronization.
Validation through defect localization in Gallium Arsenide (GaAs) nano-ridge lasers.

Main Results:

Significant improvement in IR image contrast.
Enhanced resolving capability for microscopic thermal imaging.
Effective suppression of image noise.
Successful demonstration of defect localization in GaAs nano-ridge lasers.

Conclusions:

The proposed lock-in infrared illumination method effectively enhances IR image quality for microscopic applications.
This in-situ, non-contact approach offers practical advantages over existing contrast enhancement techniques.
The method is readily integrable into existing thermal imaging systems.