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Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation

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arxiv 1912.08979 v1 pith:6RALFPFV submitted 2019-12-19 physics.optics

classification physics.optics
keywords generationfrequencyhigh-qualitymodeoutputvortexdifferencesoft-aperture
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abstract

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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