COMPOSITIONAL DEPENDENCE OF OPTICALLY ENCODED 2ND-HARMONIC GENERATIONIN PURE BINARY LEAD-SILICATE AND TERNARY BARIUM BOROSILICATE GLASSES

Ultrahigh-purity undoped binary lead-silicate and ternary barium boros ilicate glass systems were used to study the dependence of photoinduce d second-harmonic generation (SHG) on the composition of these materia ls. The experiments revealed a peak in the SHG conversion efficiency a s a function of the compositional dependence in the ternary glass syst em that correlates with the density of three-oxygen-coordinated boron. A nonexponential decay of the SHG during the readout process was obse rved for the lead-silicate glasses. In addition, these glasses exhibit ed threshold behavior in the second-harmonic conversion efficiency wit h varying IR preparation intensity. (C) 1995 Optical Society of Americ a