Related Experiment Video
Updated: Aug 23, 2025
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
21.9K
Single optical element to generate a meter-scale THz diffraction-free beam
Optics Express
|October 27, 2022
Summary
Researchers created a meter-scale terahertz (THz) diffraction-free beam using a single 3D-printed optical element. This breakthrough extends the utility of THz beams for applications like imaging large objects.
Area of Science:
- Optics and Photonics
- Terahertz (THz) Technology
- Beam Propagation
Background:
- Diffraction-free beams maintain their transverse profile during propagation, enhancing practical applications.
- Extending the diffraction-free propagation length is crucial for advanced optical systems.
Purpose of the Study:
- To demonstrate a meter-scale diffraction-free terahertz (THz) beam using a novel optical element.
- To investigate the generation mechanism and characteristics of this new type of diffraction-free beam.
Main Methods:
- Design of a unique optical element by integrating spherical harmonic functions onto an axicon.
- Fabrication of the optical element using 3D-printing technology.
- Experimental and theoretical validation of beam propagation characteristics.
Main Results:
- Achieved a THz diffraction-free beam with a propagation length exceeding 1000 mm.
- Identified a comb-like spatial frequency distribution, distinct from Bessel beams.
- Confirmed the generation of a novel type of diffraction-free beam.
Conclusions:
- A meter-scale THz diffraction-free beam can be generated with a single, 3D-printed optical element.
- The unique spatial frequency comb distribution defines this new class of diffraction-free beams.
- This technology holds potential for non-contact, non-destructive THz imaging of large objects.
