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Home  >  Volume 22 (2012)

Evaluation of Some Nonlinear Optical Parameters for Terahertz (THz) Radiating Uniaxial Crystals. by Timtere Pascal., Usman Adam and Ododo J. C. Volume 22 (November, 2012), pp 129 – 142
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In this work, nonlinear optics is used to study the nonlinear optical parameters such as the electric susceptibility χ and nonlinear index coefficient n of some uniaxial crystals. Theoretical values of these parameters were computed for three uniaxial crystals for second and fourth order harmonics, namely Lithium Niobate (LiNO3,), Calcite (CaCO3) and Rutile (TiO2). This is because they are promising nonlinear optical crystals for THz waveguides. The values of χ(2) obtained agree with the values obtained by some authors using different methods (~ 10-12 m/V), while the values of  χ(4) (~ 10-45 m3/V3) is a meaningful contribution of this work in nonlinear optics. LiNO3 has the highest nonlinearity to THz radiation of 32 pm/V, while TiO2 has the least value of 17.3 pm/V in the second order harmonics. The results also hold true for fourth order harmonics and nonlinear index coefficients. These assertions agree with most of the literatures on LiNO3 as a uniaxial crystal that possesses high nonlinear – optical coefficients.

Keywords: Terahertz, Nonlinear index coefficient, Electric susceptibility and Uniaxial crystals.