We present the results of calculation and experimental testing of an achromatic polarization converter and a composite terahertz waveplate (WP), which are represented by sets of plane-parallel birefringent plates with in-plane birefringence axis. The calculations took into account the effect of interference, which was especially prominent when plates were separated by an air gap. The possibility of development of a spectrum analyzer design based on a set of WPs is also discussed.
A new technique for the minimization of Tikhonov's parametric smoothing functional for small values of the regularization parameter is proposed. The technique makes it possible to efficiently calculate normal pseudosolutions for large scale systems of linear algebraic equations.
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