Optimum Second Harmonic Generation in Indium Antimonide

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Abstract

Using the Boltzmann’s equation (in k-space) for the motion of free carriers, an expression have been obtained for the second harmonic component of the current density in an indium antimonide (InSb) sample, at low temperatures, subjected to a d.c. electric field and an alternating electric field. This expression for the current density is used in solving the wave equation derived from Maxwell’s equations and hence, to investigate the optimum thickness (ξ0z0c) of InSb slab such that the magnitude of the second harmonic component in the reflected and transmitted waves, from the Slab, is a maximum. It is found that the amplitude of the second harmonic component in the transmitted wave is always greater than that in the reflected wave and that the efficiency of second harmonic generation has a maximum when 0.75<ξ0<0.95 for the transmitted wave and when 0.78<ξ0<1.00 for the reflected wave.

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