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arXiv · 2301.09467

High-field THz source centered at 2.6 THz

Wei Cui·Eeswar Kumar Yalavarthi·Aswin Vishnu Radhan·Mohammad Bashirpour·Angela Gamouras·Jean-Michel Ménard
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Abstract

We demonstrate a table-top high-field terahertz (THz) source based on optical rectification of a collimated near-infrared pulse in gallium phosphide (GaP) to produce peak fields exceeding 300 kV/cm with a spectrum centered at 2.6 THz. The experimental configuration, based on tilted-pulse-front phase matching, is implemented with a phase grating etched directly onto the front surface of the GaP crystal. Although the THz generation efficiency starts showing a saturation onset as the near-infrared pulse energy reaches 0.57 mJ, we can expect our configuration to yield THz peak fields up to 866 kV/cm when a 5 mJ generation NIR pulse is used. This work paves the way towards broadband, high-field THz sources able to access a new class of THz coherent control and nonlinear phenomena driven at frequencies above 2 THz.

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Wei Cui, Eeswar Kumar Yalavarthi, Aswin Vishnu Radhan, Mohammad Bashirpour, Angela Gamouras, Jean-Michel Ménard. 2023-01-23. High-field THz source centered at 2.6 THz. https://doi.org/10.1364/oe.496855

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