Difference-Frequency Generation of THz Radiation via Parametric Three-Wave Interaction in CdTe and ZnTe Crystals |
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| Authors: | Yu S Dadoenkova I O Zolotovskii I S Panyaev D G Sannikov |
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| Institution: | 1.Ulyanovsk State University,Ulyanovsk,Russia;2.Galkin Donetsk Institute for Physics and Engineering,Donetsk,Ukraine;3.Yaroslav-the-Wise Novgorod State University,Veliky Novgorod,Russia |
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| Abstract: | Difference-frequency generation of terahertz (THz) radiation in a collinear single-crystal scheme with distributed feedback implemented by means of parametric interaction of counterpropagating optical waves in a periodically inhomogeneous medium exhibiting quadratic nonlinearity is investigated. Using ZnTe and CdTe crystals optically pumped at λ = 0.77 and 1.06 μm, respectively, as an example, the possibility of obtaining parametric generation of THz radiation with an optical-to-THz conversion efficiency exceeding 10–3 (with an extremely narrow line of oscillation of less than 4 GHz for ZnTe and less than 9 GHz for CdTe at 1 THz) is demonstrated in the undepleted-pump-intensity approximation. The obtained results can be used for construction of narrow-band lasers in the THz frequency range with an output power (in the quasicw regime of oscillation) of about 105 W/cm2. |
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