Video-rate terahertz digital holographic imaging system

Area of Science:

• Optics and Photonics
• Imaging Technologies
• Materials Science

Background:

• Terahertz (THz) imaging is valuable in medical and non-destructive evaluation (NDE) fields.
• Existing THz systems are limited by high costs, slow frame rates, and low resolutions.
• Terahertz holography presents a promising solution for overcoming these limitations.

Purpose of the Study:

• To demonstrate the first full video-rate terahertz digital holography system.
• To achieve high-speed imaging at 2.52 THz using low-cost optical components.
• To assess the system's suitability for non-destructive evaluation (NDE) applications.

Main Methods:

• Development of a novel terahertz digital holography system operating at 2.52 THz.
• Utilization of low-cost optical components for system construction.
• Implementation of 2D digital reconstruction algorithms for image generation.

Main Results:

• Achieved full video-rate imaging at 50 Hz, an order of magnitude faster than previous systems.
• Demonstrated successful imaging of concealed samples within common packaging materials.
• Determined a lateral resolution of 250 µm using a 1951 USAF resolution target.

Conclusions:

• The developed THz digital holography system offers a low-cost, high-performance alternative for imaging.
• The system's high frame rate and imaging capabilities make it suitable for NDE applications.
• This advancement paves the way for more accessible and efficient THz imaging technologies.