Numerical and experimental analysis of Bessel beam properties based on continuous-wave terahertz radiation

Zhihao Xu; Lu Rong; Dayong Wang; Bin Li; Yanlin Zhao; Jie Zhao; Yunxin Wang

doi:10.1117/12.2501241

9 November 2018 Numerical and experimental analysis of Bessel beam properties based on continuous-wave terahertz radiation

Zhihao Xu, Lu Rong, Dayong Wang, Bin Li, Yanlin Zhao, Jie Zhao, Yunxin Wang

Author Affiliations +

Proceedings Volume 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V; 108261C (2018) https://doi.org/10.1117/12.2501241
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

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.

Citation Download Citation

Zhihao Xu, Lu Rong, Dayong Wang, Bin Li, Yanlin Zhao, Jie Zhao, and Yunxin Wang "Numerical and experimental analysis of Bessel beam properties based on continuous-wave terahertz radiation", Proc. SPIE 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V, 108261C (9 November 2018); https://doi.org/10.1117/12.2501241

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KEYWORDS

Bessel beams

Axicons

Gaussian beams

Terahertz radiation

Continuous wave operation

Millimeter wave imaging

Refractive index

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