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We demonstrate tunable narrowband THz generation by optical rectification of a femtosecond pulse in Orientation Patterned Gallium Phosphide. Center frequencies of 0.9 - 3.8 THz with average power up to 15 μW were achieved using a 1.064 µm fiber laser for the pump laser. Biomolecular characterization for an early application of this system is also shown in this work by anisotropic spectroscopic signature detection of molecular crystals in the THz region.
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Ian McNee, Patrick Tekavec, Vladimir Kozlov, A. G. Markelz, D. K. George, Peter Schunemann, "Tunable narrowband THz generation in orientation patterned gallium phosphide for THz anisotropy identification," Proc. SPIE 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, 1090218 (4 March 2019); https://doi.org/10.1117/12.2510522