We report on the generation of free-space terahertz (THz) radiation using polycrystalline ZnSe as the photoconductive (PC) substrate. It is found that the ZnSe emitter can be operated at peak fields up to 125 kV/cm without dielectric breakdown, and can be photoexcited (through two-photon absorption) at pump energy fluences up to 28 mJ/cm2 without saturating. The relationship between the THz field strength and the excitation conditions of the PC gap are interpreted through a photocarrier transport model.
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Holzman et al. (2003) studied this question.
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