posted on 2023-11-30, 19:20authored byKatsuhiko Miyamoto, Kazuki Sano, Takahiro Miyakawa, Hiromasa Niinomi, Kohei Toyoda, Adam Valles, Takashige Omatsu
We demonstrate the generation of high-quality tunable terahertz (THz) vortices in an eigenmode by employing soft-aperture difference frequency generation of a vortex output and a Gaussian mode. The generated THz vortex output exhibits a high-quality orbital angular momentum (OAM) mode with a topological charge of $\ell_{THz}=\pm1$ in a frequency range of 2-6 THz. The maximum average power of the THz vortex output obtained was ~3.3 $\mu$W at 4 THz.
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