Title :
Optimizing KTP and LiTaO3 channel waveguides for quasi-phase-matched second harmonic generation with high conversion efficiency
Author :
Ramanujam, Nandakumar ; Burke, James J.
Author_Institution :
Opt. Sci. Center, Arizona Univ., Tucson, AZ, USA
fDate :
2/1/1997 12:00:00 AM
Abstract :
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
Keywords :
dielectric polarisation; ferroelectric devices; lithium compounds; optical harmonic generation; optical waveguide theory; optical waveguides; optimisation; potassium compounds; KTP; KTiOPO4; LiTaO3; QPM-SHG waveguides; accurate computation; continuous periodically poled ferroelectric channel waveguides; fundamental wavelengths; guiding structure; high SHG conversion efficiency; high conversion efficiency; linear properties; lowest order transverse modes; modal properties; multiparameter optimization algorithm; normalized internal SHG conversion efficiency; optical channel waveguide optimisation; phase-matching characteristics; quasi-phase-matched second harmonic generation; second harmonic wavelengths; Electromagnetic waveguides; Ferroelectric materials; Frequency conversion; Nonlinear optical devices; Nonlinear optics; Optical frequency conversion; Optical harmonic generation; Optical waveguides; Optimization methods; Wavelength conversion;
Journal_Title :
Quantum Electronics, IEEE Journal of
