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Optimizing KTP and LiTaO3 channel waveguides for quasi-phase-matched second harmonic generation with high conversion efficiency

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2 Author(s)
Ramanujam, N. ; Opt. Sci. Center, Arizona Univ., Tucson, AZ, USA ; Burke, J.J.

The conversion efficiency of quasi-phase-matched second harmonic generation (QPM-SHG) in waveguides can be enhanced significantly by optimizing the linear properties of the guiding structure. We describe here a method for fast and accurate computation of the modal properties of continuous, periodically poled, ferroelectric channel waveguides and a multiparameter optimization algorithm which we have used to maximize normalized internal SHG conversion efficiency. We present the phase-matching characteristics of these designs and discuss the possibility of high SHG conversion efficiency between lowest order transverse modes at the fundamental and second harmonic wavelengths near noncritically phase-matched regimes of operation

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Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 2 )