Abstract
A theoretical analysis of optical-to-THz conversion efficiency via optical rectification in nonlinear crystal and the conversion efficiency comparison of ZnTe, DAST, LiNbO<sub>3</sub> is presented; The optical-to-THz conversion efficiencies are mainly affected by following several factors; Pulse durations mostly affect the conversion efficiency: Optical-to-THz conversion efficiency approaches to a maximum when crystal length is equal to the optimal length Lc, for the periodically-inverted crystals, conversion efficiency is almost proportional to the crystal length when absorption of medium is negligible. Taking account of the absorption of crystals, effective length of crystal is L<sub>eff</sub>=0.63/α, the conversion efficiency approaches to a constant eventually when the crystal length is increased for crystal DAST and LiNbO<sub>3</sub>. But the optical-to-THz wave conversion efficiency of ZnTe will increase rapidly with increase of crystal length.
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