Terahertz beam spot size measurements by a CCD camera

Area of Science:

• Optics and Photonics
• Terahertz Science and Technology

Background:

• Accurate characterization of terahertz (THz) radiation is crucial for applications in imaging, spectroscopy, and sensing.
• Traditional methods for measuring THz beam profiles can be complex or limited in resolution.

Purpose of the Study:

• To present experimental data on the spatial distribution of THz pulse intensity profiles.
• To propose and experimentally verify a novel method for measuring THz beam dimensions using a commercial charge-coupled device (CCD) camera.

Main Methods:

• Direct measurements of THz pulse intensity profiles were performed.
• A silicon-based charge-coupled device (CCD) camera was utilized for detection.
• The spectral range investigated was from 1 to 3 THz.

Main Results:

• The spatial distribution of the THz pulse intensity profile was successfully measured.
• The proposed method accurately determined the dimensions of a high-intensity THz radiation beam in the focal plane.
• Experimental verification confirmed the efficacy of the CCD-based measurement technique.

Conclusions:

• A practical and effective method for characterizing THz beams using a standard CCD camera has been established.
• This technique offers a straightforward approach for determining THz radiation beam dimensions.
• The findings contribute to improved diagnostics and control in THz applications.