Optical rectification is demonstrated in $(110)$-cut ${\mathrm{ZnGeP}}_2$ (ZGP) providing broadband terahertz (THz) generation. The source is compared to both GaP and GaAs over a wavelength range of 1150 nm to 1600 nm and peak-intensity range of $0.5\mathrm{GW}/{\mathrm{cm}}^2$ to $40\mathrm{GW}/{\mathrm{cm}}^2$. ZGP peak-to-peak field amplitude is larger than in the other materials due to either lower nonlinear absorption or larger second-order nonlinearity. This material is well suited for broadband THz generation across a wide range of infrared excitation wavelengths.

© 2012 Optical Society of America

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