Third order nonlinear optical difference frequency generation in KH2PO4, TiO2, LiNbO3, CaCO3, ZnO and CdS |
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Authors: | H. J. Eichler H. Fery J. Knof J. Eichler |
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Affiliation: | (1) Optisches Institut, Technischen Universität Berlin, Straße des 17. Juni 135, D-1000 Berlin 12, Technische Fachhochschule Berlin |
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Abstract: | Third-order nonlinear optical susceptibilities of different crystals have been measured relative to LiNbO3 by observing collinear phase-matched difference frequency generation1=22–4. The two incident light waves have been produced by a ruby laser (2,2=694.3 nm) and by induced Raman scattering (4,4=765.8 nm). With noncollinear phase-matching the number of nonlinear processes and the possibilities to determine nonlinear coefficients is much larger than in the collinear case. Therefore the theory of Raman-type third order interactions has been extended to noncollinear propagation of the interacting waves. The theory has been tested experimentally for CdS. |
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