Zhihao Xu, Lu Rong, Dayong Wang, Bin Li, Yanlin Zhao, Jie Zhao, Yunxin Wang
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10826/108261C/Numerical-and-experimental-analysis-of-Bessel-beam-properties-based-on/10.1117/12.2501241.short
Terahertz imaging technology has been widely
used in various fields. In continuous-wave terahertz imaging system, when the
large size object is located at the unfocused position, Bessel beam with non-diffractive
properties show its large depth of focus advantage over Gaussian beam. Bessel
beam can be generated by the axicon, which has high conversion efficiency. The
non-diffraction distance and the main lobe size of the Bessel beam depend on
the parameters of the axicon and incident light wavelength. We analyzed that
the influence on the axial two-dimensional intensity distribution of a
zero-order Bessel beam by changing the axicon parameters and the incident
Gaussian beam size. Experimentally, the axicon with different parameters were
fabricated using different materials. Then the two-dimensional intensity
distribution of the Bessel beam in the axial and transverse direction were
recorded and analyzed. The experimental results is basically consistent with
the theoretical ones.
