Fractional quasi phase matched broadband second harmonic generation in a tapered zinc telluride slab using total internal reflection considering the effect of nonlinear law of reflection

We analytically describe broadband second-harmonic generation in a tapered zinc telluride (ZnTe) slab using total internal reflection fractional quasi-phase matching. The simulated results, considering absorption and reflection losses, indicate 3 dB bandwidth of 477 nm, centred at 6.01 μm, with conversion efficiency of 14.98% in a 4.5 mm ZnTe slab. Finally the destructive interference effect rooting from the basic law of nonlinear reflection has been incorporated in the analysis. As a consequence, the peak conversion efficiency has reduced to 3.73% whereas the bandwidth rises to 490 nm.